답안 #133941

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
133941	2019-07-21T18:41:20 Z	egorlifar	운세 보기 2 (JOI14_fortune_telling2)	C++17	컴파일 오류	0 ms	0 KB

fortune_telling2

/*
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 */
#include <bits/stdc++.h>
#include <iostream>
#include <complex>
#include <vector>
#include <string>
#include <algorithm>
#include <cstdio>
#include <numeric>
#include <cstring>
#include <ctime>
#include <cstdlib>
#include <set>
#include <map>
#include <unordered_map>
#include <unordered_set>
#include <list>
#include <cmath>
#include <bitset>
#include <cassert>
#include <queue>
#include <stack>
#include <deque>
#include <random>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>


using namespace std;
template<typename T1, typename T2>inline void chkmin(T1 &x, T2 y) { if (x > y) x = y; }
template<typename T1, typename T2>inline void chkmax(T1 &x, T2 y) { if (x < y) x = y; }
#define sz(c) (int)(c).size()
#define all(c) (c).begin(), (c).end()
#define rall(c) (c).rbegin(), (c).rend()
#define left left224
#define right right224
#define next next224
#define rank rank224
#define prev prev224
#define y1 y1224
#define read(FILENAME) freopen((FILENAME + ".in").c_str(), "r", stdin)
#define write(FILENAME) freopen((FILENAME + ".out").c_str(), "w", stdout)
#define files(FILENAME) read(FILENAME), write(FILENAME)
#define pb push_back
#define mp make_pair
const string FILENAME = "input";
const int MAXN = 200228;
const int INF = 1e9;


typedef tree<int, null_type, less<int>, rb_tree_tag, tree_order_statistics_node_update> ordered_set;


int n, k;
int a[MAXN], b[MAXN];
pair<int, int> p[MAXN];


struct rmq
{
    vector<int> d;
    int ss = 1;
    void init(int n) {
        while (ss < n) {
            ss <<= 1;
        }
        d.resize(2 * ss);
        for (int i = 0; i < 2 * ss; i++) {
            d[i] = -INF;
        }
    }
    void upd(int i, int val) {
        d[i] = val;
        while (i >> 1 > 0) {
            i >>= 1;
            d[i] = d[i * 2] + d[i * 2 + 1];
        }
    }
    int get(int l, int r) {
        l += ss;
        r += ss;
        int res = -INF;
        while (l <= r) {
            if (l & 1) {
                chkmax(res, d[l]);
                l++;
            }
            if (!(r & 1)) {
                chkmax(res, d[r]);
                r--;
            }
            l >>= 1;
            r >>= 1;
        }
        return res;
    }
};


rmq kek;


int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
    //read(FILENAME);
    cin >> n >> k;
    vector<int> vx;
    for (int i = 0; i < n; i++) {
        cin >> a[i] >> b[i];
        vx.pb(a[i]);
        vx.pb(b[i]);
    }
    vx.pb(1e9 + 50);
    sort(all(vx));
    vx.resize(distance(vx.begin(), unique(all(vx))));
    for (int i = 0; i < n; i++) {
        a[i] = lower_bound(all(vx), a[i]) - vx.begin();
        b[i] = lower_bound(all(vx), b[i]) - vx.begin();
    }
    kek.init(sz(vx));
    vector<pair<int, int> > st;
    for (int i = 0; i < k; i++) {
        int t;
        cin >> t;
        int uk = upper_bound(all(st), t) - st.begin();
        kek.upd(uk, i);
        st.pb({uk, i});
    }
    sort(all(st));
    for (int i = 0; i < n; i++) {
        p[i] = {a[i], b[i]};
    }
    sort(p, p + n, [](pair<int, int> a, pair<int, int> b){return max(a.first, a.second) > max(b.first, b.second);});
    long long ans = 0;
    ordered_set certain;
    for (int i = 0; i < n; i++) {
        int mn = min(p[i].first, p[i].second);
        int mx = max(p[i].first, p[i].second);
        while (sz(st) && st.back().first >= mx){
            certain.insert(st.back().second);
            st.pop_back();
        }
        int lastBetween = kek.get(mn, mx - 1);
        int remainingFlip = (sz(certain) - certain.order_of_key(lastBetween)) % 2;
        int id;
        if (lastBetween == -INF) {
            id = (remainingFlip ? p[i].second: p[i].first);
        }  else {
            id = (remainingFlip ? mn: mx);
        }
        ans += vx[id];
    }
    cout << ans << endl;
    return 0;
}

Compilation message

fortune_telling2.cpp:66:9: error: 'tree' does not name a type; did you mean 'free'?
 typedef tree<int, null_type, less<int>, rb_tree_tag, tree_order_statistics_node_update> ordered_set;
         ^~~~
         free
fortune_telling2.cpp: In function 'int main()':
fortune_telling2.cpp:152:5: error: 'ordered_set' was not declared in this scope
     ordered_set certain;
     ^~~~~~~~~~~
fortune_telling2.cpp:157:13: error: 'certain' was not declared in this scope
             certain.insert(st.back().second);
             ^~~~~~~
fortune_telling2.cpp:161:33: error: 'certain' was not declared in this scope
         int remainingFlip = (sz(certain) - certain.order_of_key(lastBetween)) % 2;
                                 ^
fortune_telling2.cpp:47:21: note: in definition of macro 'sz'
 #define sz(c) (int)(c).size()
                     ^
In file included from /usr/include/c++/7/bits/stl_algobase.h:71:0,
                 from /usr/include/c++/7/bits/specfun.h:45,
                 from /usr/include/c++/7/cmath:1914,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:41,
                 from fortune_telling2.cpp:17:
/usr/include/c++/7/bits/predefined_ops.h: In instantiation of 'bool __gnu_cxx::__ops::_Val_less_iter::operator()(_Value&, _Iterator) const [with _Value = const int; _Iterator = __gnu_cxx::__normal_iterator<std::pair<int, int>*, std::vector<std::pair<int, int> > >]':
/usr/include/c++/7/bits/stl_algo.h:2052:14:   required from '_ForwardIterator std::__upper_bound(_ForwardIterator, _ForwardIterator, const _Tp&, _Compare) [with _ForwardIterator = __gnu_cxx::__normal_iterator<std::pair<int, int>*, std::vector<std::pair<int, int> > >; _Tp = int; _Compare = __gnu_cxx::__ops::_Val_less_iter]'
/usr/include/c++/7/bits/stl_algo.h:2086:32:   required from '_FIter std::upper_bound(_FIter, _FIter, const _Tp&) [with _FIter = __gnu_cxx::__normal_iterator<std::pair<int, int>*, std::vector<std::pair<int, int> > >; _Tp = int]'
fortune_telling2.cpp:142:40:   required from here
/usr/include/c++/7/bits/predefined_ops.h:90:22: error: no match for 'operator<' (operand types are 'const int' and 'std::pair<int, int>')
       { return __val < *__it; }
                ~~~~~~^~~~~~~
In file included from /usr/include/c++/7/bits/stl_algobase.h:67:0,
                 from /usr/include/c++/7/bits/specfun.h:45,
                 from /usr/include/c++/7/cmath:1914,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:41,
                 from fortune_telling2.cpp:17:
/usr/include/c++/7/bits/stl_iterator.h:888:5: note: candidate: template<class _IteratorL, class _IteratorR, class _Container> bool __gnu_cxx::operator<(const __gnu_cxx::__normal_iterator<_IteratorL, _Container>&, const __gnu_cxx::__normal_iterator<_IteratorR, _Container>&)
     operator<(const __normal_iterator<_IteratorL, _Container>& __lhs,
     ^~~~~~~~
/usr/include/c++/7/bits/stl_iterator.h:888:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/bits/stl_algobase.h:71:0,
                 from /usr/include/c++/7/bits/specfun.h:45,
                 from /usr/include/c++/7/cmath:1914,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:41,
                 from fortune_telling2.cpp:17:
/usr/include/c++/7/bits/predefined_ops.h:90:22: note:   mismatched types 'const __gnu_cxx::__normal_iterator<_IteratorL, _Container>' and 'const int'
       { return __val < *__it; }
                ~~~~~~^~~~~~~
In file included from /usr/include/c++/7/bits/stl_algobase.h:67:0,
                 from /usr/include/c++/7/bits/specfun.h:45,
                 from /usr/include/c++/7/cmath:1914,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:41,
                 from fortune_telling2.cpp:17:
/usr/include/c++/7/bits/stl_iterator.h:895:5: note: candidate: template<class _Iterator, class _Container> bool __gnu_cxx::operator<(const __gnu_cxx::__normal_iterator<_Iterator, _Container>&, const __gnu_cxx::__normal_iterator<_Iterator, _Container>&)
     operator<(const __normal_iterator<_Iterator, _Container>& __lhs,
     ^~~~~~~~
/usr/include/c++/7/bits/stl_iterator.h:895:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/bits/stl_algobase.h:71:0,
                 from /usr/include/c++/7/bits/specfun.h:45,
                 from /usr/include/c++/7/cmath:1914,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:41,
                 from fortune_telling2.cpp:17:
/usr/include/c++/7/bits/predefined_ops.h:90:22: note:   mismatched types 'const __gnu_cxx::__normal_iterator<_Iterator, _Container>' and 'const int'
       { return __val < *__it; }
                ~~~~~~^~~~~~~
In file included from /usr/include/c++/7/regex:62:0,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:110,
                 from fortune_telling2.cpp:17:
/usr/include/c++/7/bits/regex.h:1429:5: note: candidate: template<class _Bi_iter> bool std::__cxx11::operator<(const std::__cxx11::sub_match<_BiIter>&, const typename std::iterator_traits<_Iter>::value_type&)
     operator<(const sub_match<_Bi_iter>& __lhs,
     ^~~~~~~~
/usr/include/c++/7/bits/regex.h:1429:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/bits/stl_algobase.h:71:0,
                 from /usr/include/c++/7/bits/specfun.h:45,
                 from /usr/include/c++/7/cmath:1914,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:41,
                 from fortune_telling2.cpp:17:
/usr/include/c++/7/bits/predefined_ops.h:90:22: note:   mismatched types 'const std::__cxx11::sub_match<_BiIter>' and 'const int'
       { return __val < *__it; }
                ~~~~~~^~~~~~~
In file included from /usr/include/c++/7/regex:62:0,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:110,
                 from fortune_telling2.cpp:17:
/usr/include/c++/7/bits/regex.h:1349:5: note: candidate: template<class _Bi_iter> bool std::__cxx11::operator<(const typename std::iterator_traits<_Iter>::value_type&, const std::__cxx11::sub_match<_BiIter>&)
     operator<(typename iterator_traits<_Bi_iter>::value_type const& __lhs,
     ^~~~~~~~
/usr/include/c++/7/bits/regex.h:1349:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/bits/stl_algobase.h:71:0,
                 from /usr/include/c++/7/bits/specfun.h:45,
                 from /usr/include/c++/7/cmath:1914,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:41,
                 from fortune_telling2.cpp:17:
/usr/include/c++/7/bits/predefined_ops.h:90:22: note:   'std::pair<int, int>' is not derived from 'const std::__cxx11::sub_match<_BiIter>'
       { return __val < *__it; }
                ~~~~~~^~~~~~~
In file included from /usr/include/c++/7/regex:62:0,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:110,
                 from fortune_telling2.cpp:17:
/usr/include/c++/7/bits/regex.h:1272:5: note: candidate: template<class _Bi_iter> bool std::__cxx11::operator<(const std::__cxx11::sub_match<_BiIter>&, const typename std::iterator_traits<_Iter>::value_type*)
     operator<(const sub_match<_Bi_iter>& __lhs,
     ^~~~~~~~
/usr/include/c++/7/bits/regex.h:1272:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/bits/stl_algobase.h:71:0,
                 from /usr/include/c++/7/bits/specfun.h:45,
                 from /usr/include/c++/7/cmath:1914,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:41,
                 from fortune_telling2.cpp:17:
/usr/include/c++/7/bits/predefined_ops.h:90:22: note:   mismatched types 'const std::__cxx11::sub_match<_BiIter>' and 'const int'
       { return __val < *__it; }
                ~~~~~~^~~~~~~
In file included from /usr/include/c++/7/regex:62:0,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:110,
                 from fortune_telling2.cpp:17:
/usr/include/c++/7/bits/regex.h:1198:5: note: candidate: template<class _Bi_iter> bool std::__cxx11::operator<(const typename std::iterator_traits<_Iter>::value_type*, const std::__cxx11::sub_match<_BiIter>&)
     operator<(typename iterator_traits<_Bi_iter>::value_type const* __lhs,
     ^~~~~~~~
/usr/include/c++/7/bits/regex.h:1198:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/bits/stl_algobase.h:71:0,
                 from /usr/include/c++/7/bits/specfun.h:45,
                 from /usr/include/c++/7/cmath:1914,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:41,
                 from fortune_telling2.cpp:17:
/usr/include/c++/7/bits/predefined_ops.h:90:22: note:   'std::pair<int, int>' is not derived from 'const std::__cxx11::sub_match<_BiIter>'
       { return __val < *__it; }
                ~~~~~~^~~~~~~
In file included from /usr/include/c++/7/regex:62:0,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:110,
                 from fortune_telling2.cpp:17:
/usr/include/c++/7/bits/regex.h:1121:5: note: candidate: template<class _Bi_iter, class _Ch_traits, class _Ch_alloc> bool std::__cxx11::operator<(const std::__cxx11::sub_match<_BiIter>&, std::__cxx11::__sub_match_string<_Bi_iter, _Ch_traits, _Ch_alloc>&)
     operator<(const sub_match<_Bi_iter>& __lhs,
     ^~~~~~~~
/usr/include/c++/7/bits/regex.h:1121:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/bits/stl_algobase.h:71:0,
                 from /usr/include/c++/7/bits/specfun.h:45,
                 from /usr/include/c++/7/cmath:1914,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:41,
                 from fortune_telling2.cpp:17:
/usr/include/c++/7/bits/predefined_ops.h:90:22: note:   mismatched types 'const std::__cxx11::sub_match<_BiIter>' and 'const int'
       { return __val < *__it; }
                ~~~~~~^~~~~~~
In file included from /usr/include/c++/7/regex:62:0,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:110,
                 from fortune_telling2.cpp:17:
/usr/include/c++/7/bits/regex.h:1041:5: note: candidate: template<class _Bi_iter, class _Ch_traits, class _Ch_alloc> bool std::__cxx11::operator<(std::__cxx11::__sub_match_string<_Bi_iter, _Ch_traits, _Ch_alloc>&, const std::__cxx11::sub_match<_BiIter>&)
     operator<(const __sub_match_string<_Bi_iter, _Ch_traits, _Ch_alloc>& __lhs,
     ^~~~~~~~
/usr/include/c++/7/bits/regex.h:1041:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/bits/stl_algobase.h:71:0,
                 from /usr/include/c++/7/bits/specfun.h:45,
                 from /usr/include/c++/7/cmath:1914,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:41,
                 from fortune_telling2.cpp:17:
/usr/include/c++/7/bits/predefined_ops.h:90:22: note:   mismatched types 'std::__cxx11::__sub_match_string<_Bi_iter, _Ch_traits, _Ch_alloc>' and 'const int'
       { return __val < *__it; }
                ~~~~~~^~~~~~~
In file included from /usr/include/c++/7/regex:62:0,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:110,
                 from fortune_telling2.cpp:17:
/usr/include/c++/7/bits/regex.h:962:5: note: candidate: template<class _BiIter> bool std::__cxx11::operator<(const std::__cxx11::sub_match<_BiIter>&, const std::__cxx11::sub_match<_BiIter>&)
     operator<(const sub_match<_BiIter>& __lhs, const sub_match<_BiIter>& __rhs)
     ^~~~~~~~
/usr/include/c++/7/bits/regex.h:962:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/bits/stl_algobase.h:71:0,
                 from /usr/include/c++/7/bits/specfun.h:45,
                 from /usr/include/c++/7/cmath:1914,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:41,
                 from fortune_telling2.cpp:17:
/usr/include/c++/7/bits/predefined_ops.h:90:22: note:   mismatched types 'const std::__cxx11::sub_match<_BiIter>' and 'const int'
       { return __val < *__it; }
                ~~~~~~^~~~~~~
In file included from /usr/include/c++/7/future:39:0,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:105,
                 from fortune_telling2.cpp:17:
/usr/include/c++/7/thread:281:3: note: candidate: bool std::operator<(std::thread::id, std::thread::id)
   operator<(thread::id __x, thread::id __y) noexcept
   ^~~~~~~~
/usr/include/c++/7/thread:281:3: note:   no known conversion for argument 1 from 'const int' to 'std::thread::id'
In file included from /usr/include/c++/7/forward_list:38:0,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:104,
                 from fortune_telling2.cpp:17:
/usr/include/c++/7/bits/forward_list.h:1391:5: note: candidate: template<class _Tp, class _Alloc> bool std::operator<(const std::forward_list<_Tp, _Alloc>&, const std::forward_list<_Tp, _Alloc>&)
     operator<(const forward_list<_Tp, _Alloc>& __lx,
     ^~~~~~~~
/usr/include/c++/7/bits/forward_list.h:1391:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/bits/stl_algobase.h:71:0,
                 from /usr/include/c++/7/bits/specfun.h:45,
                 from /usr/include/c++/7/cmath:1914,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:41,
                 from fortune_telling2.cpp:17:
/usr/include/c++/7/bits/predefined_ops.h:90:22: note:   mismatched types 'const std::forward_list<_Tp, _Alloc>' and 'const int'
       { return __val < *__it; }
                ~~~~~~^~~~~~~
In file included from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:95:0,
                 from fortune_telling2.cpp:17:
/usr/include/c++/7/valarray:1186:1: note: candidate: template<class _Tp> std::_Expr<std::_BinClos<std::__less, std::_Constant, std::_ValArray, _Tp, _Tp>, typename std::__fun<std::__less, _Tp>::result_type> std::operator<(const _Tp&, const std::valarray<_Tp>&)
 _DEFINE_BINARY_OPERATOR(<, __less)
 ^
/usr/include/c++/7/valarray:1186:1: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/bits/stl_algobase.h:71:0,
                 from /usr/include/c++/7/bits/specfun.h:45,
                 from /usr/include/c++/7/cmath:1914,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:41,
                 from fortune_telling2.cpp:17:
/usr/include/c++/7/bits/predefined_ops.h:90:22: note:   'std::pair<int, int>' is not derived from 'const std::valarray<_Tp>'
       { return __val < *__it; }
                ~~~~~~^~~~~~~
In file included from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:95:0,
                 from fortune_telling2.cpp:17:
/usr/include/c++/7/valarray:1186:1: note: candidate: template<class _Tp> std::_Expr<std::_BinClos<std::__less, std::_ValArray, std::_Constant, _Tp, _Tp>, typename std::__fun<std::__less, _Tp>::result_type> std::operator<(const std::valarray<_Tp>&, const _Tp&)
 _DEFINE_BINARY_OPERATOR(<, __less)
 ^
/usr/include/c++/7/valarray:1186:1: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/bits/stl_algobase.h:71:0,
                 from /usr/include/c++/7/bits/specfun.h:45,
                 from /usr/include/c++/7/cmath:1914,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:41,
                 from fortune_telling2.cpp:17:
/usr/include/c++/7/bits/predefined_ops.h:90:22: note:   mismatched types 'const std::valarray<_Tp>' and 'const int'
       { return __val < *__it; }
                ~~~~~~^~~~~~~
In file included from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:95:0,
                 from fortune_telling2.cpp:17:
/usr/include/c++/7/valarray:1186:1: note: candidate: template<class _Tp> std::_Expr<std::_BinClos<std::__less, std::_ValArray, std::_ValArray, _Tp, _Tp>, typename std::__fun<std::__less, _Tp>::result_type> std::operator<(const std::valarray<_Tp>&, const std::valarray<_Tp>&)
 _DEFINE_BINARY_OPERATOR(<, __less)
 ^
/usr/include/c++/7/valarray:1186:1: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/bits/stl_algobase.h:71:0,
                 from /usr/include/c++/7/bits/specfun.h:45,
                 from /usr/include/c++/7/cmath:1914,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:41,
                 from fortune_telling2.cpp:17:
/usr/include/c++/7/bits/predefined_ops.h:90:22: note:   mismatched types 'const std::valarray<_Tp>' and 'const int'
       { return __val < *__it; }
                ~~~~~~^~~~~~~
In file included from /usr/include/c++/7/valarray:592:0,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:95,
                 from fortune_telling2.cpp:17:
/usr/include/c++/7/bits/valarray_after.h:416:5: note: candidate: template<class _Dom> std::_Expr<std::_BinClos<std::__less, std::_ValArray, std::_Expr, typename _Dom::value_type, _Dom>, typename std::__fun<std::__less, typename _Dom1::value_type>::result_type> std::operator<(const std::valarray<typename _Dom::value_type>&, const std::_Expr<_Dom1, typename _Dom1::value_type>&)
     _DEFINE_EXPR_BINARY_OPERATOR(<, __less)
     ^
/usr/include/c++/7/bits/valarray_after.h:416:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/bits/stl_algobase.h:71:0,
                 from /usr/include/c++/7/bits/specfun.h:45,
                 from /usr/include/c++/7/cmath:1914,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:41,
                 from fortune_telling2.cpp:17:
/usr/include/c++/7/bits/predefined_ops.h:90:22: note:   'std::pair<int, int>' is not derived from 'const std::_Expr<_Dom1, typename _Dom1::value_type>'
       { return __val < *__it; }
                ~~~~~~^~~~~~~
In file included from /usr/include/c++/7/valarray:592:0,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:95,
                 from fortune_telling2.cpp:17:
/usr/include/c++/7/bits/valarray_after.h:416:5: note: candidate: template<class _Dom> std::_Expr<std::_BinClos<std::__less, std::_Expr, std::_ValArray, _Dom, typename _Dom::value_type>, typename std::__fun<std::__less, typename _Dom1::value_type>::result_type> std::operator<(const std::_Expr<_Dom1, typename _Dom1::value_type>&, const std::valarray<typename _Dom::value_type>&)
     _DEFINE_EXPR_BINARY_OPERATOR(<, __less)
     ^
/usr/include/c++/7/bits/valarray_after.h:416:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/bits/stl_algobase.h:71:0,
                 from /usr/include/c++/7/bits/specfun.h:45,
                 from /usr/include/c++/7/cmath:1914,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:41,
                 from fortune_telling2.cpp:17:
/usr/include/c++/7/bits/predefined_ops.h:90:22: note:   mismatched types 'const std::_Expr<_Dom1, typename _Dom1::value_type>' and 'const int'
       { return __val < *__it; }
                ~~~~~~^~~~~~~
In file included fro