Language: C++

#include<bits/stdc++.h>
#define ll long long
using namespace std;
#define maxn 100010
#define mod 1000000007
int f[maxn];
int pe[maxn];
struct cv{
    int x,y;
}a[100010];
bool cmp(cv p,cv q){
    if(p.x!=q.x) return p.x<q.x;
    return p.y<q.y;
}
int fi(int x){
    if(f[x]==x) return x;
    f[x]=fi(f[x]);
    return f[x];
}
int c[maxn][3];
int main(){
    ll n,m,q;
    scanf("%lld%lld%lld",&n,&m,&q);
    int ff=1,x,y;
    for(int i=0;i<n;i++) f[i]=i;
    for(int i=0;i<q;i++){
        scanf("%d%d%d",&c[i][0],&c[i][1],&c[i][2]);
        if(c[i][2]==0){
            x=fi(c[i][0]);
            y=fi(c[i][1]);
            if(x!=y){
                f[x]=y;
            }
        }
    }
    ll cnt=0;
    for(int i=0;i<n;i++){
        if(f[i]==i) cnt++;
    }
    if(n-1+(cnt-1)*cnt/2<m){
        ff=0;
    }
    ll sum=0;
    for(int i=0;i<q&&ff;i++){
        if(c[i][2]==1){
            if(cnt==2){
                ff=0;
                break;
            }
            x=fi(c[i][0]);
            y=fi(c[i][1]);
            if(x==y){
                ff=0;
                break;
            }
            a[sum].x=min(x,y);
            a[sum].y=max(x,y);
            sum++;
        }
    }
    sort(a,a+sum,cmp);
    int su=1;
    for(int i=1;i<sum;i++){
        if(a[i]==a[i-1]){
            ;
        }
        else{
            a[su++]=a[i];
        }
    }
    sum=su;
    ll z=sum/2;
    if(sum%2) z++;
    // for(int i=0;i<sum;i++){
    //     x=fi(a[i].x),y=fi(a[i].y);
    //     if(pe[x]||pe[y]){
    //         ;
    //     }
    //     else{
    //         pe[x]=1,pe[y]=1;
    //         z++;
    //     }
    // }
    if(n-1+z>m){
        ff=0;
    }
    if(ff) printf("Yes\n");
    else printf("No\n");
    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:64:16: error: no match for 'operator==' (operand types are 'cv' and 'cv')
   64 |         if(a[i]==a[i-1]){
      |            ~~~~^~~~~~~~
      |               |       |
      |               cv      cv
In file included from /usr/include/c++/14/regex:68,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:181,
                 from a.cc:1:
/usr/include/c++/14/bits/regex.h:1103:5: note: candidate: 'template<class _BiIter> bool std::__cxx11::operator==(const sub_match<_BiIter>&, const sub_match<_BiIter>&)'
 1103 |     operator==(const sub_match<_BiIter>& __lhs, const sub_match<_BiIter>& __rhs)
      |     ^~~~~~~~
/usr/include/c++/14/bits/regex.h:1103:5: note:   template argument deduction/substitution failed:
a.cc:64:23: note:   'cv' is not derived from 'const std::__cxx11::sub_match<_BiIter>'
   64 |         if(a[i]==a[i-1]){
      |                       ^
/usr/include/c++/14/bits/regex.h:1199:5: note: candidate: 'template<class _Bi_iter, class _Ch_traits, class _Ch_alloc> bool std::__cxx11::operator==(__sub_match_string<_Bi_iter, _Ch_traits, _Ch_alloc>&, const sub_match<_BiIter>&)'
 1199 |     operator==(const __sub_match_string<_Bi_iter, _Ch_traits, _Ch_alloc>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/regex.h:1199:5: note:   template argument deduction/substitution failed:
a.cc:64:23: note:   'cv' is not derived from 'std::__cxx11::__sub_match_string<_Bi_iter, _Ch_traits, _Ch_alloc>'
   64 |         if(a[i]==a[i-1]){
      |                       ^
/usr/include/c++/14/bits/regex.h:1274:5: note: candidate: 'template<class _Bi_iter, class _Ch_traits, class _Ch_alloc> bool std::__cxx11::operator==(const sub_match<_BiIter>&, __sub_match_string<_Bi_iter, _Ch_traits, _Ch_alloc>&)'
 1274 |     operator==(const sub_match<_Bi_iter>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/regex.h:1274:5: note:   template argument deduction/substitution failed:
a.cc:64:23: note:   'cv' is not derived from 'const std::__cxx11::sub_match<_BiIter>'
   64 |         if(a[i]==a[i-1]){
      |                       ^
/usr/include/c++/14/bits/regex.h:1366:5: note: candidate: 'template<class _Bi_iter> bool std::__cxx11::operator==(const typename std::iterator_traits<_Iter>::value_type*, const sub_match<_BiIter>&)'
 1366 |     operator==(typename iterator_traits<_Bi_iter>::value_type const* __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/regex.h:1366:5: note:   template argument deduction/substitution failed:
a.cc:64:23: note:   'cv' is not derived from 'const std::__cxx11::sub_match<_BiIter>'
   64 |         if(a[i]==a[i-1]){
      |                       ^
/usr/include/c++/14/bits/regex.h:1441:5: note: candidate: 'template<class _Bi_iter> bool std::__cxx11::operator==(const sub_match<_BiIter>&, const typename std::iterator_traits<_Iter>::value_type*)'
 1441 |     operator==(const sub_match<_Bi_iter>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/regex.h:1441:5: note:   template argument deduction/substitution failed:
a.cc:64:23: note:   'cv' is not derived from 'const std::__cxx11::sub_match<_BiIter>'
   64 |         if(a[i]==a[i-1]){
      |                       ^
/usr/include/c++/14/bits/regex.h:1534:5: note: candidate: 'template<class _Bi_iter> bool std::__cxx11::operator==(const typename std::iterator_traits<_Iter>::value_type&, const sub_match<_BiIter>&)'
 1534 |     operator==(typename iterator_traits<_Bi_iter>::value_type const& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/regex.h:1534:5: note:   template argument deduction/substitution failed:
a.cc:64:23: note:   'cv' is not derived from 'const std::__cxx11::sub_match<_BiIter>'
   64 |         if(a[i]==a[i-1]){
      |                       ^
/usr/include/c++/14/bits/regex.h:1613:5: note: candidate: 'template<class _Bi_iter> bool std::__cxx11::operator==(const sub_match<_BiIter>&, const typename std::iterator_traits<_Iter>::value_type&)'
 1613 |     operator==(const sub_match<_Bi_iter>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/regex.h:1613:5: note:   template argument deduction/substitution failed:
a.cc:64:23: note:   'cv' is not derived from 'const std::__cxx11::sub_match<_BiIter>'
   64 |         if(a[i]==a[i-1]){
      |                       ^
/usr/include/c++/14/bits/regex.h:2186:5: note: candidate: 'template<class _Bi_iter, class _Alloc> bool std::__cxx11::operator==(const match_results<_BiIter, _Alloc>&, const match_results<_BiIter, _Alloc>&)'
 2186 |     operator==(const match_results<_Bi_iter, _Alloc>& __m1,
      |     ^~~~~~~~
/usr/include/c++/14/bits/regex.h:2186:5: note:   template argument deduction/substitution failed:
a.cc:64:23: note:   'cv' is not derived from 'const std::__cxx11::match_results<_BiIter, _Alloc>'
   64 |         if(a[i]==a[i-1]){
      |                       ^
In file included from /usr/include/c++/14/bits/stl_algobase.h:64,
                 from /usr/include/c++/14/algorithm:60,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:51:
/usr/include/c++/14/bits/stl_pair.h:1033:5: note: candidate: 'template<class _T1, class _T2> constexpr bool std::operator==(const pair<_T1, _T2>&, const pair<_T1, _T2>&)'
 1033 |     operator==(const pair<_T1, _T2>& __x, const pair<_T1, _T2>& __y)
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_pair.h:1033:5: note:   template argument deduction/substitution failed:
a.cc:64:23: note:   'cv' is not derived from 'const std::pair<_T1, _T2>'
   64 |         if(a[i]==a[i-1]){
      |                       ^
In file included from /usr/include/c++/14/bits/stl_algobase.h:67:
/usr/include/c++/14/bits/stl_iterator.h:441:5: note: candidate: 'template<class _Iterator> constexpr bool std::operator==(const reverse_iterator<_Iterator>&, const reverse_iterator<_Iterator>&)'
  441 |     operator==(const reverse_iterator<_Iterator>& __x,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:441:5: note:   template argument deduction/substitution failed:
a.cc:64:23: note:   'cv' is not derived from 'const std::reverse_iterator<_Iterator>'
   64 |         if(a[i]==a[i-1]){
      |                       ^
/usr/include/c++/14/bits/stl_iterator.h:486:5: note: candidate: 'template<class _IteratorL, class _IteratorR> constexpr bool std::operator==(const reverse_iterator<_Iterator>&, const reverse_iterator<_IteratorR>&)'
  486 |     operator==(const reverse_iterator<_IteratorL>& __x,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:486:5: note:   template argument deduction/substitution failed:
a.cc:64:23: note:   'cv' is not derived from 'const std::reverse_iterator<_Iterator>'
   64 |         if(a[i]==a[i-1]){
      |                       ^
/usr/include/c++/14/bits/stl_iterator.h:1667:5: note: candidate: 'template<class _IteratorL, class _IteratorR> constexpr bool std::operator==(const move_iterator<_IteratorL>&, const move_iterator<_IteratorR>&)'
 1667 |     operator==(const move_iterator<_IteratorL>& __x,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:1667:5: note:   template argument deduction/substitution failed:
a.cc:64:23: note:   'cv' is not derived from 'const std::move_iterator<_IteratorL>'
   64 |         if(a[i]==a[i-1]){
      |                       ^
/usr/include/c++/14/bits/stl_iterator.h:1737:5: note: candidate: 'template<class _Iterator> constexpr bool std::operator==(const move_iterator<_IteratorL>&, const move_iterator<_IteratorL>&)'
 1737 |     operator==(const move_iterator<_Iterator>& __x,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:1737:5: note:   template argument deduction/substitution failed:
a.cc:64:23: note:   'cv' is not derived from 'const std::move_iterator<_IteratorL>'
   64 |         if(a[i]==a[i-1]){
      |                       ^
In file included from /usr/include/c++/14/bits/char_traits.h:42,
                 from /usr/include/c++/14/string:42,
                 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/postypes.h:192:5: note: candidate: 'template<class _StateT> bool std::operator==(const fpos<_StateT>&, const fpos<_StateT>&)'
  192 |     operator==(const fpos<_StateT>& __lhs, const fpos<_StateT>& __rhs)
      |     ^~~~~~~~
/usr/include/c++/14/bits/postypes.h:192:5: note:   template argument deduction/substitution failed:
a.cc:64:23: note:   'cv' is not derived from 'const std::fpos<_StateT>'
   64 |         if(a[i]==a[i-1]){
      |                       ^
In file included from /usr/include/c++/14/string:43:
/usr/include/c++/14/bits/allocator.h:235:5: note: candidate: 'template<class _T1, class _T2> bool std::operator==(const allocator<_CharT>&, const allocator<_T2>&)'
  235 |     operator==(const allocator<_T1>&, const allocator<_T2>&)
      |     ^~~~~~~~
/usr/include/c++/14/bits/allocator.h:235:5: note:   template argument deduction/substitution failed:
a.cc:64:23: note:   'cv' is not derived from 'const std::allocator<_CharT>'
   64 |         if(a[i]==a[i-1]){
      |                       ^
In file included from /usr/include/c++/14/bits/basic_string.h:47,
                 from /usr/include/c++/14/string:54:
/usr/include/c++/14/string_view:629:5: note: candidate: 'template<class _CharT, class _Traits> constexpr bool std::operator==(basic_string_view<_CharT, _Traits>, __type_identity_t<basic_string_view<_CharT, _Traits> >)'
  629 |     operator==(basic_string_view<_CharT, _Traits> __x,
      |     ^~~~~~~~
/usr/include/c++/14/string_view:629:5: note:   template argument deduction/substitution failed:
a.cc:64:23: note:   'cv' is not derived from 'std::basic_string_view<_CharT, _Traits>'
   64 |         if(a[i]==a[i-1]){
      |                       ^
/usr/include/c++/14/string_view:637:5: note: candidate: 'template<class _CharT, class _Traits> constexpr bool std::operator==(basic_string_view<_CharT, _Traits>, basic_string_view<_CharT, _Traits>)'
  637 |     operator==(basic_string_view<_CharT, _Traits> __x,
      |     ^~~~~~~~
/usr/include/c++/14/string_view:637:5: note:   template argument deduction/substitution failed:
a.cc:64:23: note:   'cv' is not derived from 'std::basic_string_view<_CharT, _Traits>'
   64 |         if(a[i]==a[i-1]){
      |