답안 #296821

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
296821	2020-09-10T23:12:40 Z	fivefourthreeone	City Mapping (NOI18_citymapping)	C++17	컴파일 오류	0 ms	0 KB

citymapping

#include "citymapping.h"
    //#pragma GCC target ("avx2")
    #pragma GCC optimization ("O3")
    #pragma GCC optimization ("unroll-loops")
    #include <bits/stdc++.h>
    #define owo(i,a, b) for(auto i=(a);i<(b); ++i)
    #define uwu(i,a, b) for(auto i=(a)-1; i>=(b); --i)
    #define senpai push_back
    #define ttgl pair<int, int>
    #define ayaya cout<<"ayaya~"<<endl
    using namespace std;
    /*#include <ext/pb_ds/assoc_container.hpp>
    #include <ext/pb_ds/tree_policy.hpp>
    using namespace __gnu_pbds;
    #define ordered_set tree<ttgl, null_type,less<ttgl>, rb_tree_tag,tree_order_statistics_node_update>*/
     
    using ll = long long;
    using ld = long double;
    const ll MOD = 1000000007;
    const ll root = 62;
    ll gcd(ll a,ll b){return b?gcd(b,a%b):a;}
    ll binpow(ll a,ll b){ll res=1;while(b){if(b&1)res=(res*a)%MOD;a=(a*a)%MOD;b>>=1;}return res;}
    ll modInv(ll a){return binpow(a, MOD-2);}
    const double PI = acos(-1);
    const double eps = 1e-6;
    const int INF = 0x3f3f3f3f;
    const int NINF = 0xc0c0c0c0;
    const ll INFLL = 0x3f3f3f3f3f3f3f3f;
    const ll NINFLL = 0xc0c0c0c0c0c0c0c0;
    const int mxN = 1001;
    ll dist[mxN][mxN];
    int sz[mxN];
    int par[mxN];
    int rt;
    vector<pair<int, ll>> adj[mxN];
    //ll get_distance(int a, int b) {return 0;}
    ll qd(int a, int b) {
        if(a==b)return 0;
        if(dist[a][b])return dist[a][b];
        return dist[a][b] = dist[b][a] = get_distance(a, b);
    }
    int find(int u) {
        if(adj[u].size()==0)return u;
        int mx = 0;
        int cc = 0;
        for(auto v: adj[u]) {
            if(sz[v.first] > mx) {
                mx = sz[v.first];
                cc = v.first;
            }
        }
        return find(cc);
    }
    int solve(int u, int res, ll w) {
        if(adj[u].size()==0)return u;
        int bot = find(u);
        int nxt = bot;
      	int bdd = nxt;
        ll path = qd(res, nxt);
        while(qd(u, bot) + w  < qd(u, nxt)*2 + path) {
          	bdd = nxt;
            nxt = par[nxt];
        }
        if(adj[nxt].size()<=1)return nxt;
      	if(adj[nxt][0]==bdd)swap(adj[nxt][0], adj[nxt][1]);
        return solve(adj[nxt][0].first, res, w - qd(u, adj[nxt][0].first));
    }
    int n;
    void find_roads(int N, int Q, int* a, int* b, int* w) {
        n = N;
        int mxd = 0;
        owo(i, 1, n+1) {
            if(qd(i, 1) > mxd) {
                mxd = qd(i, 1);
                rt = i;
            }
        }
        sz[rt] = 1;
        vector<pair<ll, int>> all;
        owo(i, 1, n+1) {
            if(i^rt) {
                all.senpai({qd(i, rt), i});
            }
        }
        sort(all.begin(), all.end());
        for(auto p: all) {
            par[p.second] = solve(rt, p.second, p.first);
            adj[par[p.second]].senpai({p.second, p.first - qd(par[p.second], rt)});
            int up = p.second;
            while(up) {
                sz[p.second]++;
                sort(adj[up].begin(), adj[up].end(), [&](pair<int, ll> a, pair<int, ll> b) {
                    return sz[a.first] < sz[b.second];
                });
                dist[up][p.second] = dist[p.second][up] = qd(rt, p.second) - qd(rt, up);
                up = par[up];
            }
        }
        int cnt = 0;
        owo(i, 1, n+1) {
            for(auto p: adj[i]) {
                a[cnt] = i;
                b[cnt] = p.first;
                w[cnt++] = p.second;
            }
        }
    }
    /*int main() {
        //freopen("file.in", "r", stdin);
        //freopen("file.out", "w", stdout);
        mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());
        cin.tie(0)->sync_with_stdio(0);
        return 0;
    }*/

Compilation message

citymapping.cpp:3: warning: ignoring #pragma GCC optimization [-Wunknown-pragmas]
    3 |     #pragma GCC optimization ("O3")
      | 
citymapping.cpp:4: warning: ignoring #pragma GCC optimization [-Wunknown-pragmas]
    4 |     #pragma GCC optimization ("unroll-loops")
      | 
citymapping.cpp: In function 'int solve(int, int, ll)':
citymapping.cpp:65:22: error: no match for 'operator==' (operand types are '__gnu_cxx::__alloc_traits<std::allocator<std::pair<int, long long int> >, std::pair<int, long long int> >::value_type' {aka 'std::pair<int, long long int>'} and 'int')
   65 |        if(adj[nxt][0]==bdd)swap(adj[nxt][0], adj[nxt][1]);
In file included from /usr/include/c++/9/regex:62,
                 from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:110,
                 from citymapping.cpp:5:
/usr/include/c++/9/bits/regex.h:1026:5: note: candidate: 'template<class _BiIter> bool std::__cxx11::operator==(const std::__cxx11::sub_match<_BiIter>&, const std::__cxx11::sub_match<_BiIter>&)'
 1026 |     operator==(const sub_match<_BiIter>& __lhs, const sub_match<_BiIter>& __rhs)
      |     ^~~~~~~~
/usr/include/c++/9/bits/regex.h:1026:5: note:   template argument deduction/substitution failed:
citymapping.cpp:65:24: note:   '__gnu_cxx::__alloc_traits<std::allocator<std::pair<int, long long int> >, std::pair<int, long long int> >::value_type' {aka 'std::pair<int, long long int>'} is not derived from 'const std::__cxx11::sub_match<_BiIter>'
   65 |        if(adj[nxt][0]==bdd)swap(adj[nxt][0], adj[nxt][1]);
      |                        ^~~
In file included from /usr/include/c++/9/regex:62,
                 from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:110,
                 from citymapping.cpp:5:
/usr/include/c++/9/bits/regex.h:1099:5: 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>&)'
 1099 |     operator==(const __sub_match_string<_Bi_iter, _Ch_traits, _Ch_alloc>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/9/bits/regex.h:1099:5: note:   template argument deduction/substitution failed:
citymapping.cpp:65:24: note:   '__gnu_cxx::__alloc_traits<std::allocator<std::pair<int, long long int> >, std::pair<int, long long int> >::value_type' {aka 'std::pair<int, long long int>'} is not derived from 'std::__cxx11::__sub_match_string<_Bi_iter, _Ch_traits, _Ch_alloc>'
   65 |        if(adj[nxt][0]==bdd)swap(adj[nxt][0], adj[nxt][1]);
      |                        ^~~
In file included from /usr/include/c++/9/regex:62,
                 from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:110,
                 from citymapping.cpp:5:
/usr/include/c++/9/bits/regex.h:1173:5: 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>&)'
 1173 |     operator==(const sub_match<_Bi_iter>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/9/bits/regex.h:1173:5: note:   template argument deduction/substitution failed:
citymapping.cpp:65:24: note:   '__gnu_cxx::__alloc_traits<std::allocator<std::pair<int, long long int> >, std::pair<int, long long int> >::value_type' {aka 'std::pair<int, long long int>'} is not derived from 'const std::__cxx11::sub_match<_BiIter>'
   65 |        if(adj[nxt][0]==bdd)swap(adj[nxt][0], adj[nxt][1]);
      |                        ^~~
In file included from /usr/include/c++/9/regex:62,
                 from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:110,
                 from citymapping.cpp:5:
/usr/include/c++/9/bits/regex.h:1247:5: note: candidate: 'template<class _Bi_iter> bool std::__cxx11::operator==(const typename std::iterator_traits<_Iter>::value_type*, const std::__cxx11::sub_match<_BiIter>&)'
 1247 |     operator==(typename iterator_traits<_Bi_iter>::value_type const* __lhs,
      |     ^~~~~~~~
/usr/include/c++/9/bits/regex.h:1247:5: note:   template argument deduction/substitution failed:
citymapping.cpp:65:24: note:   mismatched types 'const std::__cxx11::sub_match<_BiIter>' and 'int'
   65 |        if(adj[nxt][0]==bdd)swap(adj[nxt][0], adj[nxt][1]);
      |                        ^~~
In file included from /usr/include/c++/9/regex:62,
                 from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:110,
                 from citymapping.cpp:5:
/usr/include/c++/9/bits/regex.h:1321:5: note: candidate: 'template<class _Bi_iter> bool std::__cxx11::operator==(const std::__cxx11::sub_match<_BiIter>&, const typename std::iterator_traits<_Iter>::value_type*)'
 1321 |     operator==(const sub_match<_Bi_iter>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/9/bits/regex.h:1321:5: note:   template argument deduction/substitution failed:
citymapping.cpp:65:24: note:   '__gnu_cxx::__alloc_traits<std::allocator<std::pair<int, long long int> >, std::pair<int, long long int> >::value_type' {aka 'std::pair<int, long long int>'} is not derived from 'const std::__cxx11::sub_match<_BiIter>'
   65 |        if(adj[nxt][0]==bdd)swap(adj[nxt][0], adj[nxt][1]);
      |                        ^~~
In file included from /usr/include/c++/9/regex:62,
                 from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:110,
                 from citymapping.cpp:5:
/usr/include/c++/9/bits/regex.h:1395:5: note: candidate: 'template<class _Bi_iter> bool std::__cxx11::operator==(const typename std::iterator_traits<_Iter>::value_type&, const std::__cxx11::sub_match<_BiIter>&)'
 1395 |     operator==(typename iterator_traits<_Bi_iter>::value_type const& __lhs,
      |     ^~~~~~~~
/usr/include/c++/9/bits/regex.h:1395:5: note:   template argument deduction/substitution failed:
citymapping.cpp:65:24: note:   mismatched types 'const std::__cxx11::sub_match<_BiIter>' and 'int'
   65 |        if(adj[nxt][0]==bdd)swap(adj[nxt][0], adj[nxt][1]);
      |                        ^~~
In file included from /usr/include/c++/9/regex:62,
                 from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:110,
                 from citymapping.cpp:5:
/usr/include/c++/9/bits/regex.h:1473:5: note: candidate: 'template<class _Bi_iter> bool std::__cxx11::operator==(const std::__cxx11::sub_match<_BiIter>&, const typename std::iterator_traits<_Iter>::value_type&)'
 1473 |     operator==(const sub_match<_Bi_iter>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/9/bits/regex.h:1473:5: note:   template argument deduction/substitution failed:
citymapping.cpp:65:24: note:   '__gnu_cxx::__alloc_traits<std::allocator<std::pair<int, long long int> >, std::pair<int, long long int> >::value_type' {aka 'std::pair<int, long long int>'} is not derived from 'const std::__cxx11::sub_match<_BiIter>'
   65 |        if(adj[nxt][0]==bdd)swap(adj[nxt][0], adj[nxt][1]);
      |                        ^~~
In file included from /usr/include/c++/9/regex:62,
                 from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:110,
                 from citymapping.cpp:5:
/usr/include/c++/9/bits/regex.h:1991:5: note: candidate: 'template<class _Bi_iter, class _Alloc> bool std::__cxx11::operator==(const std::__cxx11::match_results<_BiIter, _Alloc>&, const std::__cxx11::match_results<_BiIter, _Alloc>&)'
 1991 |     operator==(const match_results<_Bi_iter, _Alloc>& __m1,
      |     ^~~~~~~~
/usr/include/c++/9/bits/regex.h:1991:5: note:   template argument deduction/substitution failed:
citymapping.cpp:65:24: note:   '__gnu_cxx::__alloc_traits<std::allocator<std::pair<int, long long int> >, std::pair<int, long long int> >::value_type' {aka 'std::pair<int, long long int>'} is not derived from 'const std::__cxx11::match_results<_BiIter, _Alloc>'
   65 |        if(adj[nxt][0]==bdd)swap(adj[nxt][0], adj[nxt][1]);
      |                        ^~~
In file included from /usr/include/c++/9/bits/stl_algobase.h:64,
                 from /usr/include/c++/9/bits/specfun.h:45,
                 from /usr/include/c++/9/cmath:1927,
                 from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:41,
                 from citymapping.cpp:5:
/usr/include/c++/9/bits/stl_pair.h:448:5: note: candidate: 'template<class _T1, class _T2> constexpr bool std::operator==(const std::pair<_T1, _T2>&, const std::pair<_T1, _T2>&)'
  448 |     operator==(const pair<_T1, _T2>& __x, const pair<_T1, _T2>& __y)
      |     ^~~~~~~~
/usr/include/c++/9/bits/stl_pair.h:448:5: note:   template argument deduction/substitution failed:
citymapping.cpp:65:24: note:   mismatched types 'const std::pair<_T1, _T2>' and 'int'
   65 |        if(adj[nxt][0]==bdd)swap(adj[nxt][0], adj[nxt][1]);
      |                        ^~~
In file included from /usr/include/c++/9/bits/stl_algobase.h:67,
                 from /usr/include/c++/9/bits/specfun.h:45,
                 from /usr/include/c++/9/cmath:1927,
                 from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:41,
                 from citymapping.cpp:5:
/usr/include/c++/9/bits/stl_iterator.h:325:5: note: candidate: 'template<class _Iterator> constexpr bool std::operator==(const std::reverse_iterator<_Iterator>&, const std::reverse_iterator<_Iterator>&)'
  325 |     operator==(const reverse_iterator<_Iterator>& __x,
      |     ^~~~~~~~
/usr/include/c++/9/bits/stl_iterator.h:325:5: note:   template argument deduction/substitution failed:
citymapping.cpp:65:24: note:   '__gnu_cxx::__alloc_traits<std::allocator<std::pair<int, long long int> >, std::pair<int, long long int> >::value_type' {aka 'std::pair<int, long long int>'} is not derived from 'const std::reverse_iterator<_Iterator>'
   65 |        if(adj[nxt][0]==bdd)swap(adj[nxt][0], adj[nxt][1]);
      |                        ^~~
In file included from /usr/include/c++/9/bits/stl_algobase.h:67,
                 from /usr/include/c++/9/bits/specfun.h:45,
                 from /usr/include/c++/9/cmath:1927,
                 from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:41,
                 from citymapping.cpp:5:
/usr/include/c++/9/bits/stl_iterator.h:363:5: note: candidate: 'template<class _IteratorL, class _IteratorR> constexpr bool std::operator==(const std::reverse_iterator<_Iterator>&, const std::reverse_iterator<_IteratorR>&)'
  363 |     operator==(const reverse_iterator<_IteratorL>& __x,
      |     ^~~~~~~~
/usr/include/c++/9/bits/stl_iterator.h:363:5: note:   template argument deduction/substitution failed:
citymapping.cpp:65:24: note:   '__gnu_cxx::__alloc_traits<std::allocator<std::pair<int, long long int> >, std::pair<int, long long int> >::value_type' {aka 'std::pair<int, long long int>'} is not derived from 'const std::reverse_iterator<_Iterator>'
   65 |        if(adj[nxt][0]==bdd)swap(adj[nxt][0], adj[nxt][1]);
      |                        ^~~
In file included from /usr/include/c++/9/bits/stl_algobase.h:67,
                 from /usr/include/c++/9/bits/specfun.h:45,
                 from /usr/include/c++/9/cmath:1927,
                 from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:41,
                 from citymapping.cpp:5:
/usr/include/c++/9/bits/stl_iterator.h:1139:5: note: candidate: 'template<class _IteratorL, class _IteratorR> constexpr bool std::operator==(const std::move_iterator<_IteratorL>&, const std::move_iterator<_IteratorR>&)'
 1139 |     operator==(const move_iterator<_IteratorL>& __x,
      |     ^~~~~~~~
/usr/include/c++/9/bits/stl_iterator.h:1139:5: note:   template argument deduction/substitution failed:
citymapping.cpp:65:24: note:   '__gnu_cxx::__alloc_traits<std::allocator<std::pair<int, long long int> >, std::pair<int, long long int> >::value_type' {aka 'std::pair<int, long long int>'} is not derived from 'const std::move_iterator<_IteratorL>'
   65 |        if(adj[nxt][0]==bdd)swap(adj[nxt][0], adj[nxt][1]);
      |                        ^~~
In file included from /usr/include/c++/9/bits/stl_algobase.h:67,
                 from /usr/include/c++/9/bits/specfun.h:45,
                 from /usr/include/c++/9/cmath:1927,
                 from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:41,
                 from citymapping.cpp:5:
/usr/include/c++/9/bits/stl_iterator.h:1145:5: note: candidate: 'template<class _Iterator> constexpr bool std::operator==(const std::move_iterator<_IteratorL>&, const std::move_iterator<_IteratorL>&)'
 1145 |     operator==(const move_iterator<_Iterator>& __x,
      |     ^~~~~~~~
/usr/include/c++/9/bits/stl_iterator.h:1145:5: note:   template argument deduction/substitution failed:
citymapping.cpp:65:24: note:   '__gnu_cxx::__alloc_traits<std::allocator<std::pair<int, long long int> >, std::pair<int, long long int> >::value_type' {aka 'std::pair<int, long long int>'} is not derived from 'const std::move_iterator<_IteratorL>'
   65 |        if(adj[nxt][0]==bdd)swap(adj[nxt][0], adj[nxt][1]);
      |                        ^~~
In file included from /usr/include/c++/9/iosfwd:40,
                 from /usr/include/c++/9/ios:38,
                 from /usr/include/c++/9/istream:38,
                 from /usr/include/c++/9/sstream:38,
                 from /usr/include/c++/9/complex:45,
                 from /usr/include/c++/9/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:54,
                 from citymapping.cpp:5:
/usr/include/c++/9/bits/postypes.h:222:5: note: candidate: 'template<class _StateT> bool std::operator==(const std::fpos<_StateT>&, const std::fpos<_StateT>&)'
  222 |     operator==(const fpos<_StateT>& __lhs, const fpos<_StateT>& __rhs)
      |     ^~~~~~~~
/usr/include/c++/9/bits/postypes.h:222:5: note:   template argument deduction/substitution failed:
citymapping.cpp:65:24: note:   '__gnu_cxx::__alloc_traits<std::allocator<std::pair<int, long long int> >, std::pair<int, long long int> >::value_type' {aka 'std::pair<int, long long int>'} is not derived from 'const std::fpos<_StateT>'
   65 |        if(adj[nxt][0]==bdd)swap(adj[nxt][0], adj[nxt][1]);
      |                        ^~~
In file included from /usr/include/c++/9/string:41,
                 from /usr/include/c++/9/bits/locale_classes.h:40,
                 from /usr/include/c++/9/bits/ios_base.h:41,
                 from /usr/include/c++/9/ios:42,
                 from /usr/include/c++/9/istream:38,
                 from /usr/include/c++/9/sstream:38,
                 from /usr/include/c++/9/complex:45,
                 from /usr/include/c++/9/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:54,
                 from citymapping.cpp:5:
/usr/include/c++/9/bits/allocator.h:168:5: note: candidate: 'template<class _T1, class _T2> bool std::operator==(const std::allocator<_CharT>&, const std::allocator<_T2>&)'
  168 |     operator==(const allocator<_T1>&, const allocator<_T2>&)
      |     ^~~~~~~~
/usr/include/c++/9/bits/allocator.h:168:5: note:   template argument deduction/substitution failed:
citymapping.cpp:65:24: note:   '__gnu_cxx::__alloc_traits<std::allocator<std::pair<int, long long int> >, std::pair<int, long long int> >::value_type' {aka 'std::pair<int, long long int>'} is not derived from 'const std::allocator<_CharT>'
   65 |        if(adj[nxt][0]==bdd)swap(adj[nxt][0], adj[nxt][1]);
      |                        ^~~
In file included from /usr/include/c++/9/bits/basic_string.h:48,
                 from /usr/include/c++/9/string:55,
                 from /usr/include/c++/9/bits/locale_classes.h:40,
                 from /usr/include/c++/9/bits/ios_base.h:41,
                 from /usr/include/c++/9/ios:42,
                 from /usr/include/c++/9/istream:38,
                 from /usr/include/c++/9/sstream:38,
                 from /usr/include/c++/9/complex:45,
                 from /usr/include/c++/9/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:54,
                 from citymapping.cpp:5:
/usr/include/c++/9/string_view:473:5: note: candidate: 'template<class _CharT, class _Traits> constexpr bool std::operator==(std::basic_string_view<_CharT, _Traits>, std::basic_string_view<_CharT, _Traits>)'
  473 |     operator==(basic_string_view<_CharT, _Traits> __x,
      |     ^~~~~~~~
/usr/include/c++/9/string_view:473:5: note:   template argument deduction/substitution failed:
citymapping.cpp:65:24: note:   'std::pair<int, long long int>' is not derived from 'std::basic_string_view<_CharT, _Traits>'
   65 |        if(adj[nxt][0]==bdd)swap(adj[nxt][0], adj[nxt][1]);
      |                        ^~~
In file included from /usr/include/c++/9/bits/basic_string.h:48,
                 from /usr/include/c++/9/string:55,
                 from /usr/include/c++/9/bits/locale_classes.h:40,
                 from /usr/include/c++/9/bits/ios_base.h:41,
                 from /usr/include/c++/9/ios:42,
                 from /usr/include/c++/9/istream:38,
                 from /usr/include/c++/9/sstream:38,
                 from /usr/include/c++/9/complex:45,
                 from /usr/include/c++/9/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:54,
                 from citymapping.cpp:5:
/usr/include/c++/9/string_view:479:5: note: candidate: 'template<class _CharT, class _Traits> constexpr bool std::operator==(std::basic_string_view<_CharT, _Traits>, std::__detail::__idt<std::basic_string_view<_CharT, _Traits> >)'
  479 |     operator==(basic_string_view<_CharT, _Traits> __x,
      |     ^~~~~~~~
/usr/include/c++/9/string_view:479:5: note:   template argument deduction/substitution failed:
citymapping.cpp:65:24: note:   'std::pair<int, long long int>' is not derived from 'std::basic_string_view<_CharT, _Traits>'
   65 |        if(adj[nxt][0]==bdd)swap(adj[nxt][0], adj[nxt][1]);
      |                        ^~~
In file included from /usr/include/c++/9/bits/basic_string.h:48,
                 from /usr/include/c++/9/string:55,
                 from /usr/include/c++/9/bits/locale_classes.h:40,
                 from /usr/include/c++/9/bits/ios_base.h:41,
                 from /usr/include/c++/9/ios:42,
                 from /usr/include/c++/9/istream:38,
                 from /usr/include/c++/9/sstream:38,
                 from /usr/include/c++/9/complex:45,
                 from /usr/include/c++/9/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:54,
                 from citymapping.cpp:5:
/usr/include/c++/9/string_view:485:5: note: candidate: 'template<class _CharT, class _Traits> constexpr bool std::operator==(std::__detail::__idt<std::basic_string_view<_CharT, _Traits> >, std::basic_string_view<_CharT, _Traits>)'
  485 |     operator==(__detail::__idt<basic_string_view<_CharT, _Traits>> __x,
      |     ^~~~~~~~
/usr/include/c++/9/string_view:485:5: note:   template argument deduction/substitution failed:
citymapping.cpp:65:24: note:   mismatched types 'std::basic_string_view<_CharT, _Traits>' and 'int'
   65 |        if(adj[nxt][0]==bdd)swap(adj[nxt][0], adj[nxt][1]);
      |                        ^~~
In file included from /u