Submission #44756

#	Time	Username	Problem	Language	Result	Execution time	Memory
44756		PowerOfNinjaGo	Factories (JOI14_factories)	C++17	Compilation error	0 ms	0 KiB

factories

//Power Of Ninja Go
#include <bits/stdc++.h>
#ifdef atom
    #include "grader.cpp"
#else
    #include "factories.h"
#endif
using namespace std;
typedef long long ll; typedef pair<int, int> ii; typedef vector<int> vi; typedef vector< ii > vii;
#define X first
#define Y second
#define pb push_back
#define mp make_pair
const int maxn = 5e5+5;
vii adj[maxn];
int dp[22][maxn];
int h[maxn];
ll sweep[maxn];
int cnt[maxn];
bool use[maxn];
int tim = 1;
int zil[maxn];
ll red[4*maxn], blue[4*maxn];
int n;
ll query(ll *st, int i, int j, int p = 1, int L = 1, int R = n)
{
    if(i> R || j< L) return 4e18;
    if(i<= L && R<= j) return st[p];
    ll x = query(st, i, j, 2*p, L, (L+R)/2);
    ll y = query(st, i, j, 2*p+1, (L+R)/2+1, R);
    return min(x, y);
}
void build(ll *st, vector<pair<int, int> > &vec, int p = 1, int L = 1, int R = n)
{
    if(L == R)
    {
        st[p] = sweep[vec[L].Y];
        return;
    }
    build(st, vec, 2*p, L, (L+R)/2);
    build(st, vec, 2*p+1, (L+R)/2+1, R);
    st[p] = min(st[2*p], st[2*p+1]);
}
void trv(int u, int p)
{
    cnt[u] = 1;
    zil[u] = tim;
    tim++;
    for(auto edge : adj[u])
    {
        int v = edge.X, w = edge.Y;
        if(v != p)
        {
            h[v] = h[u]+1;
            dp[0][v] = u;
            sweep[v] = sweep[u]+w;
            trv(v, u);
            cnt[u] += cnt[v];
        }
    }
}
bool cmp(int u, int v)
{
    return zil[u]< zil[v];
}
int LCA(int u, int v)
{
    if(h[u]< h[v]) swap(u, v);
    //printf("%d %d\n", u, v);
    for(int i = 20; i>= 0; i--)
    {
        int x = dp[i][u];
        if(h[x]>= h[v]) u = x;
    }
    if(u == v) return u;
    //printf("%d\n", h[7]);
    //printf("now %d %d\n", u, v);
    for(int i = 20; i>= 0; i--)
    {
        int x = dp[i][u], y = dp[i][v];
        if(x == y) continue;
        u = x; v = y;
    }
    return dp[0][u];
}
ll dist(int u, int v)
{
    int x = LCA(u, v);
    return sweep[u]+sweep[v]-2LL*sweep[x];
}
void Init(int N, int A[], int B[], int D[])
{
    n = N;
    for(int i = 0; i< N-1; i++)
    {
        int u, v; u = A[i]+1; v = B[i]+1;
        int w = D[i];
        adj[u].pb(ii(v, w));
        adj[v].pb(ii(u, w));
    }
    h[1] = 1; trv(1, 0);
    for(int i = 1; i<= 20; i++)
        for(int j = 1; j<= N; j++)
            dp[i][j] = dp[i-1][dp[i-1][j]];
}
long long Query(int S, int X[], int T, int Y[])
{
    vector<int> all;
    vector< ii >  b, r;
    b.pb(ii(-1e9, 0));
    r.pb(ii(-1e9, 0));
    for(int i = 0; i< S; i++) X[i]++;
    for(int i = 0; i< T; i++) Y[i]++;
    for(int i = 0; i< S; i++) all.pb(X[i]), r.pb(mp(zil[X[i]], X[i]));
    for(int i = 0; i< T; i++) all.pb(Y[i]), b.pb(mp(zil[Y[i]], X[i]));
    sort(r.begin(), r.end()); sort(b.begin(), b.end());
    build(red, r, 1, 1, S); build(blue, b, 1, 1, T);
    sort(all.begin(), all.end(), cmp);
    //for(auto x : all) printf("%d ", x);
    //printf("\n");
    vector<int> matt; matt = all;
    for(int i = 1; i< (int) all.size(); i++)
    {
        int x = LCA(all[i], all[i-1]);
        if(x == all[i] or x == all[i-1]) continue;
        matt.pb(x);
    }
    ll best = 4e18;
    for(auto top : matt)
    {
        int lend = zil[top], rend = zil[top]+cnt[top]-1;
        int x1 = lower_bound(r.begin(), r.end(), mp(lend, (ll)-4e18))-r.begin();
        int y1 = upper_bound(r.begin(), r.end(), mp(rend, (ll)4e18))-r.begin()-1;
        int x2 = lower_bound(b.begin(), b.end(), mp(lend, (ll)-4e18))-b.begin();
        int y2 = upper_bound(b.begin(), b.end(), mp(rend, (ll)4e18))-b.begin()-1;
        ll bestred = query(red, x1, y1, 1, 1, S);
        ll bestblue = query(blue, x2, y2, 1, 1, T);
        best = min(best, bestred+bestblue-2*sweep[top]);
    }
    return best;
}

Compilation message (stderr)

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 factories.cpp:2:
/usr/include/c++/7/bits/predefined_ops.h: In instantiation of 'bool __gnu_cxx::__ops::_Iter_less_val::operator()(_Iterator, _Value&) const [with _Iterator = __gnu_cxx::__normal_iterator<std::pair<int, int>*, std::vector<std::pair<int, int> > >; _Value = const std::pair<int, long long int>]':
/usr/include/c++/7/bits/stl_algobase.h:959:14:   required from '_ForwardIterator std::__lower_bound(_ForwardIterator, _ForwardIterator, const _Tp&, _Compare) [with _ForwardIterator = __gnu_cxx::__normal_iterator<std::pair<int, int>*, std::vector<std::pair<int, int> > >; _Tp = std::pair<int, long long int>; _Compare = __gnu_cxx::__ops::_Iter_less_val]'
/usr/include/c++/7/bits/stl_algobase.h:993:32:   required from '_ForwardIterator std::lower_bound(_ForwardIterator, _ForwardIterator, const _Tp&) [with _ForwardIterator = __gnu_cxx::__normal_iterator<std::pair<int, int>*, std::vector<std::pair<int, int> > >; _Tp = std::pair<int, long long int>]'
factories.cpp:132:69:   required from here
/usr/include/c++/7/bits/predefined_ops.h:65:22: error: no match for 'operator<' (operand types are 'std::pair<int, int>' and 'const std::pair<int, long long int>')
       { return *__it < __val; }
                ~~~~~~^~~~~~~
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 factories.cpp:2:
/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 factories.cpp:2:
/usr/include/c++/7/bits/predefined_ops.h:65:22: note:   'std::pair<int, int>' is not derived from 'const __gnu_cxx::__normal_iterator<_IteratorL, _Container>'
       { return *__it < __val; }
                ~~~~~~^~~~~~~
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 factories.cpp:2:
/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 factories.cpp:2:
/usr/include/c++/7/bits/predefined_ops.h:65:22: note:   'std::pair<int, int>' is not derived from 'const __gnu_cxx::__normal_iterator<_Iterator, _Container>'
       { return *__it < __val; }
                ~~~~~~^~~~~~~
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 factories.cpp:2:
/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 factories.cpp:2:
/usr/include/c++/7/bits/predefined_ops.h:65:22: note:   'std::pair<int, int>' is not derived from 'const std::__cxx11::sub_match<_BiIter>'
       { return *__it < __val; }
                ~~~~~~^~~~~~~
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 factories.cpp:2:
/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 factories.cpp:2:
/usr/include/c++/7/bits/predefined_ops.h:65:22: note:   'const std::pair<int, long long int>' is not derived from 'const std::__cxx11::sub_match<_BiIter>'
       { return *__it < __val; }
                ~~~~~~^~~~~~~
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 factories.cpp:2:
/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 factories.cpp:2:
/usr/include/c++/7/bits/predefined_ops.h:65:22: note:   'std::pair<int, int>' is not derived from 'const std::__cxx11::sub_match<_BiIter>'
       { return *__it < __val; }
                ~~~~~~^~~~~~~
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 factories.cpp:2:
/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 factories.cpp:2:
/usr/include/c++/7/bits/predefined_ops.h:65:22: note:   'const std::pair<int, long long int>' is not derived from 'const std::__cxx11::sub_match<_BiIter>'
       { return *__it < __val; }
                ~~~~~~^~~~~~~
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 factories.cpp:2:
/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 factories.cpp:2:
/usr/include/c++/7/bits/predefined_ops.h:65:22: note:   'std::pair<int, int>' is not derived from 'const std::__cxx11::sub_match<_BiIter>'
       { return *__it < __val; }
                ~~~~~~^~~~~~~
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 factories.cpp:2:
/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 factories.cpp:2:
/usr/include/c++/7/bits/predefined_ops.h:65:22: note:   'std::pair<int, int>' is not derived from 'std::__cxx11::__sub_match_string<_Bi_iter, _Ch_traits, _Ch_alloc>'
       { return *__it < __val; }
                ~~~~~~^~~~~~~
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 factories.cpp:2:
/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 factories.cpp:2:
/usr/include/c++/7/bits/predefined_ops.h:65:22: note:   'std::pair<int, int>' is not derived from 'const std::__cxx11::sub_match<_BiIter>'
       { return *__it < __val; }
                ~~~~~~^~~~~~~
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 factories.cpp:2:
/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 'std::pair<int, 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 factories.cpp:2:
/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 factories.cpp:2:
/usr/include/c++/7/bits/predefined_ops.h:65:22: note:   'std::pair<int, int>' is not derived from 'const std::forward_list<_Tp, _Alloc>'
       { return *__it < __val; }
                ~~~~~~^~~~~~~
In file included from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:95:0,
                 from factories.cpp:2:
/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 factories.cpp:2:
/usr/include/c++/7/bits/predefined_ops.h:65:22: note:   'const std::pair<int, long long int>' is not derived from 'const std::valarray<_Tp>'
       { return *__it < __val; }
                ~~~~~~^~~~~~~
In file included from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:95:0,
                 from factories.cpp:2:
/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 factories.cpp:2:
/usr/include/c++/7/bits/predefined_ops.h:65:22: note:   'std::pair<int, int>' is not derived from 'const std::valarray<_Tp>'
       { return *__it < __val; }
                ~~~~~~^~~~~~~
In file included from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:95:0,
                 from factories.cpp:2:
/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 factories.cpp:2:
/usr/include/c++/7/bits/predefined_ops.h:65:22: note:   'std::pair<int, int>' is not derived from 'const std::valarray<_Tp>'
       { return *__it < __val; }
                ~~~~~~^~~~~~~
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 factories.cpp:2:
/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 factories.cpp:2:
/usr/include/c++/7/bits/predefined_ops.h:65:22: note:   'const std::pair<int, long long int>' is not derived from 'const std::_Expr<_Dom1, typename _Dom1::value_type>'
       { return *__it < __val; }
                ~~~~~~^~~~~~~
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 factories.cpp:2:
/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 factories.cpp:2:
/usr/include/c++/7/bits/predefined_ops.h:65:22: note:   'std::pair<int, int>' is not derived from 'const std::_Expr<_Dom1, typename _Dom1::value_type>'
       { return *__it < __val; }
                ~~~~~~^~~~~~~
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 factories.cpp:2:
/usr/include/c++/7/bits/valarray_after.h:416:5: note: candidate: template<class _Dom> std::_Expr<std::_BinClos<std::__less, std::_Constant, std::_Expr, typename _Dom::value_type, _Dom>, typename std::__fun<std::__less, typename _Dom1::value_type>::result_type> std::operator<(const 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 argume