Language: C++

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>

using namespace std;
using namespace __gnu_pbds;

#define fi first
#define se second
#define mp make_pair
#define pb push_back
#define fbo find_by_order
#define ook order_of_key

typedef long long ll;
typedef pair<int,int> ii;
typedef vector<int> vi;
typedef long double ld;
typedef tree<int, null_type, less<int>, rb_tree_tag, tree_order_statistics_node_update> pbds;
typedef set<int>::iterator sit;
typedef map<int,int>::iterator mit;
typedef vector<int>::iterator vit;

// template from zscoder
ll n,m;
vector< ii > graph(200002);
ll ans[200002];

void dfs(int u)
{
    for(ii x: graph[u])
    {
        int v = x.fi;  int w = x.se;
        if(ans[v] < (-10e17))
        {
            ans[v] = ans[u] + w;
            dfs(v);
        }
        else
        {
            if(ans[v]!=(ans[u]+w))
            {
                cout << "No" << endl;
                exit();
            }
        }
    }
}

int main()
{
    ios_base::sync_with_stdio(0); cin.tie(0);
    //freopen("input.txt","r",stdin); freopen("output.txt","w",stdout);
    cin >> n >> m;
    int l,r,d;
    for(int i = 0 ; i < m; i++)
    {
        cin >> l >> r >> d;
        l--; r--;
        graph[l].pb(mp(r,d));
        graph[r].pb(mp(l,d));
    }
    memset(ans,ll(-10e18),sizeof(ans));
    for(int i=0;i<n;i++)
	{
		if(ans[i]<-ll(1e17))
		{
			ans[i]=0;
			dfs(i);
		}
	}
    cout << "Yes" << endl;
}


Compiler output:
a.cc: In function 'void dfs(int)':
a.cc:31:22: error: no matching function for call to 'begin(std::pair<int, int>&)'
   31 |     for(ii x: graph[u])
      |                      ^
In file included from /usr/include/c++/14/bits/algorithmfwd.h:39,
                 from /usr/include/c++/14/bits/stl_algo.h:59,
                 from /usr/include/c++/14/algorithm:61,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:51,
                 from a.cc:1:
/usr/include/c++/14/initializer_list:88:5: note: candidate: 'template<class _Tp> constexpr const _Tp* std::begin(initializer_list<_Tp>)'
   88 |     begin(initializer_list<_Tp> __ils) noexcept
      |     ^~~~~
/usr/include/c++/14/initializer_list:88:5: note:   template argument deduction/substitution failed:
a.cc:31:22: note:   'std::pair<int, int>' is not derived from 'std::initializer_list<_Tp>'
   31 |     for(ii x: graph[u])
      |                      ^
In file included from /usr/include/c++/14/string:53,
                 from /usr/include/c++/14/bitset:52,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:52:
/usr/include/c++/14/bits/range_access.h:52:5: note: candidate: 'template<class _Container> constexpr decltype (__cont.begin()) std::begin(_Container&)'
   52 |     begin(_Container& __cont) -> decltype(__cont.begin())
      |     ^~~~~
/usr/include/c++/14/bits/range_access.h:52:5: note:   template argument deduction/substitution failed:
/usr/include/c++/14/bits/range_access.h: In substitution of 'template<class _Container> constexpr decltype (__cont.begin()) std::begin(_Container&) [with _Container = std::pair<int, int>]':
a.cc:31:22:   required from here
   31 |     for(ii x: graph[u])
      |                      ^
/usr/include/c++/14/bits/range_access.h:52:50: error: 'struct std::pair<int, int>' has no member named 'begin'
   52 |     begin(_Container& __cont) -> decltype(__cont.begin())
      |                                           ~~~~~~~^~~~~
/usr/include/c++/14/bits/range_access.h:63:5: note: candidate: 'template<class _Container> constexpr decltype (__cont.begin()) std::begin(const _Container&)'
   63 |     begin(const _Container& __cont) -> decltype(__cont.begin())
      |     ^~~~~
/usr/include/c++/14/bits/range_access.h:63:5: note:   template argument deduction/substitution failed:
/usr/include/c++/14/bits/range_access.h: In substitution of 'template<class _Container> constexpr decltype (__cont.begin()) std::begin(const _Container&) [with _Container = std::pair<int, int>]':
a.cc:31:22:   required from here
   31 |     for(ii x: graph[u])
      |                      ^
/usr/include/c++/14/bits/range_access.h:63:56: error: 'const struct std::pair<int, int>' has no member named 'begin'
   63 |     begin(const _Container& __cont) -> decltype(__cont.begin())
      |                                                 ~~~~~~~^~~~~
/usr/include/c++/14/bits/range_access.h:95:5: note: candidate: 'template<class _Tp, long unsigned int _Nm> constexpr _Tp* std::begin(_Tp (&)[_Nm])'
   95 |     begin(_Tp (&__arr)[_Nm]) noexcept
      |     ^~~~~
/usr/include/c++/14/bits/range_access.h:95:5: note:   template argument deduction/substitution failed:
a.cc:31:22: note:   mismatched types '_Tp [_Nm]' and 'std::pair<int, int>'
   31 |     for(ii x: graph[u])
      |                      ^
In file included from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:166:
/usr/include/c++/14/valarray:1227:5: note: candidate: 'template<class _Tp> _Tp* std::begin(valarray<_Tp>&)'
 1227 |     begin(valarray<_Tp>& __va) noexcept
      |     ^~~~~
/usr/include/c++/14/valarray:1227:5: note:   template argument deduction/substitution failed:
a.cc:31:22: note:   'std::pair<int, int>' is not derived from 'std::valarray<_Tp>'
   31 |     for(ii x: graph[u])
      |                      ^
/usr/include/c++/14/valarray:1238:5: note: candidate: 'template<class _Tp> const _Tp* std::begin(const valarray<_Tp>&)'
 1238 |     begin(const valarray<_Tp>& __va) noexcept
      |     ^~~~~
/usr/include/c++/14/valarray:1238:5: note:   template argument deduction/substitution failed:
a.cc:31:22: note:   'std::pair<int, int>' is not derived from 'const std::valarray<_Tp>'
   31 |     for(ii x: graph[u])
      |                      ^
a.cc:31:22: error: no matching function for call to 'end(std::pair<int, int>&)'
/usr/include/c++/14/initializer_list:99:5: note: candidate: 'template<class _Tp> constexpr const _Tp* std::end(initializer_list<_Tp>)'
   99 |     end(initializer_list<_Tp> __ils) noexcept
      |     ^~~
/usr/include/c++/14/initializer_list:99:5: note:   template argument deduction/substitution failed:
a.cc:31:22: note:   'std::pair<int, int>' is not derived from 'std::initializer_list<_Tp>'
   31 |     for(ii x: graph[u])
      |                      ^
/usr/include/c++/14/bits/range_access.h:74:5: note: candidate: 'template<class _Container> constexpr decltype (__cont.end()) std::end(_Container&)'
   74 |     end(_Container& __cont) -> decltype(__cont.end())
      |     ^~~
/usr/include/c++/14/bits/range_access.h:74:5: note:   template argument deduction/substitution failed:
/usr/include/c++/14/bits/range_access.h: In substitution of 'template<class _Container> constexpr decltype (__cont.end()) std::end(_Container&) [with _Container = std::pair<int, int>]':
a.cc:31:22:   required from here
   31 |     for(ii x: graph[u])
      |                      ^
/usr/include/c++/14/bits/range_access.h:74:48: error: 'struct std::pair<int, int>' has no member named 'end'
   74 |     end(_Container& __cont) -> decltype(__cont.end())
      |                                         ~~~~~~~^~~
/usr/include/c++/14/bits/range_access.h:85:5: note: candidate: 'template<class _Container> constexpr decltype (__cont.end()) std::end(const _Container&)'
   85 |     end(const _Container& __cont) -> decltype(__cont.end())
      |     ^~~
/usr/include/c++/14/bits/range_access.h:85:5: note:   template argument deduction/substitution failed:
/usr/include/c++/14/bits/range_access.h: In substitution of 'template<class _Container> constexpr decltype (__cont.end()) std::end(const _Container&) [with _Container = std::pair<int, int>]':
a.cc:31:22:   required from here
   31 |     for(ii x: graph[u])
      |                      ^
/usr/include/c++/14/bits/range_access.h:85:54: error: 'const struct std::pair<int, int>' has no member named 'end'
   85 |     end(const _Container& __cont) -> decltype(__cont.end())
      |                                               ~~~~~~~^~~
/usr/include/c++/14/bits/range_access.h:106:5: note: candidate: 'template<class _Tp, long unsigned int _Nm> constexpr _Tp* std::end(_Tp (&)[_Nm])'
  106 |     end(_Tp (&__arr)[_Nm]) noexcept
      |     ^~~
/usr/include/c++/14/bits/range_access.h:106:5: note:   template argument deduction/substitution failed:
a.cc:31:22: note:   mismatched types '_Tp [_Nm]' and 'std::pair<int, int>'
   31 |     for(ii x: graph[u])
      |                      ^
/usr/include/c++/14/valarray:1249:5: note: candidate: 'template<class _Tp> _Tp* std::end(valarray<_Tp>&)'
 1249 |     end(valarray<_Tp>& __va) noexcept
      |     ^~~
/usr/include/c++/14/valarray:1249:5: note:   template argument deduction/substitution failed:
a.cc:31:22: note:   'std::pair<int, int>' is not derived from 'std::valarray<_Tp>'
   31 |     for(ii x: graph[u])
      |                      ^
/usr/include/c++/14/valarray:1265:5: note: candidate: 'template<class _Tp> const _Tp* std::end(const valarray<_Tp>&)'
 1265 |     end(const valarray<_Tp>& __va) noexcept
      |     ^~~
/usr/include/c++/14/valarray:1265:5: note:   template argument deduction/substitution failed:
a.cc:31:22: note:   'std::pair<int, int>' is not derived from 'const std::valarray<_Tp>'
   31 |     for(ii x: graph[u])
      |                      ^
a.cc:44:21: error: too few arguments to function 'void exit(int)'
   44 |                 exit();
      |                 ~~~~^~
In file included from /usr/include/c++/14/cstdlib:79,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:42:
/usr/include/stdlib.h:756:13: note: declared here
  756 | extern void exit (int __status) __THROW __attribute__ ((__noreturn__));
      |             ^~~~
a.cc: In function 'int main()':
a.cc:11:12: error: '__gnu_cxx::__alloc_traits<std::allocator<std::pair<int, int> >, std::pair<int, int> >::value_type' {aka 'struct std::pair<int, int>'} has no member named 'push_back'
   11 | #define pb push_back
      |            ^~~~~~~~~
a.cc:60:18: note: in expansion of macro 'pb'
   60 |         graph[l].pb(mp(r,d));
      |                  ^~
a.cc:11:12: error: '__gnu_cxx::__alloc_traits<std::allocator<std::pair<int, int> >, std::pair<int, int> >::value_type' {aka 'struct std::pair<int, int>'} has no member named 'push_back'
   11 | #define pb push_back
      |            ^~~~~~~~~
a.cc:61:18: note: in expansion of macro 'pb'
   61 |         graph[r].pb(mp(l,d));
      |                  ^~