Language: C++

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
int main(){
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	ll n, m, l;
	cin >> n >> m >> l;
	vector <pair <ll, ll> > adjList[n];
	for(ll i = 0; i < m; i++){
		ll a, b, c;
		cin >> a >> b >> c;
		a--; b--;
		if(c <= l){
			adjList[a].push_back(make_pair(b, c));
			adjList[b].push_back(make_pair(a, c));
		}
	}
	ll q;
	cin >> q;
	for(ll i = 0; i < q; i++){
		ll x, y;
		cin >> x >> y;
		x--; y--;
		pair <ll, ll> dist[n];
		fill(dist, dist + n, make_pair(1000000000, 1000000000));
		priority_queue<tuple<ll, ll, ll>, vector <tuple<ll, ll, ll> >, greater <tuple<ll, ll, ll> > > pq;
		pq.emplace(0, 0, x);
		dist[x] = make_pair(0, 0);
		while(!pq.empty()){
			ll f, d, u;
			tie(f, d, u) = pq.top();
			//cout << f << ' ' << d << ' ' << u << '\n';
			pq.pop();
			if(dist[u].first < f || (dist[u].first == f && dist[u].second < d)) continue;
			for(ll i = 0; i < adjList[u].size(); i++){
				ll v = adjList[u][i].first;
				ll w = adjList[u][i].second;
				if(dist[u].second + w > l){
					if(dist[u].first + 1 < dist[v].first || (dist[u].first == dist[v].first && w < dist[v].second)){
						dist[v].first = dist[u].first + 1;
						dist[v].second = w;
						pq.emplace(dist[v].first, dist[v].second, v);
					}
				}else{
					if(dist[u].first < dist[v].first || (dist[u].first == dist[v].first && dist[u].second + w < dist[v].second)){
						dist[v].first = dist[u].first;
						dist[v].second = dist[u].second + w;
						pq.emplace(dist[v].first, dist[v].second, v);
					}
				}
			}
		}
		if(dist[y] == make_pair(1000000000, 1000000000)){
			cout << "-1\n";
		}else{
			cout << dist[y].first << '\n';
		}
	}
}

Compiler output:
a.cc: In function 'int main()':
a.cc:54:28: error: no match for 'operator==' (operand types are 'std::pair<long long int, long long int>' and 'std::pair<int, int>')
   54 |                 if(dist[y] == make_pair(1000000000, 1000000000)){
      |                    ~~~~~~~ ^~ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
      |                          |             |
      |                          |             pair<int,int>
      |                          pair<long long int,long long int>
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:54:63: note:   'std::pair<long long int, long long int>' is not derived from 'const std::__cxx11::sub_match<_BiIter>'
   54 |                 if(dist[y] == make_pair(1000000000, 1000000000)){
      |                                                               ^
/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:54:63: note:   'std::pair<long long int, long long int>' is not derived from 'std::__cxx11::__sub_match_string<_Bi_iter, _Ch_traits, _Ch_alloc>'
   54 |                 if(dist[y] == make_pair(1000000000, 1000000000)){
      |                                                               ^
/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:54:63: note:   'std::pair<long long int, long long int>' is not derived from 'const std::__cxx11::sub_match<_BiIter>'
   54 |                 if(dist[y] == make_pair(1000000000, 1000000000)){
      |                                                               ^
/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:54:63: note:   'std::pair<int, int>' is not derived from 'const std::__cxx11::sub_match<_BiIter>'
   54 |                 if(dist[y] == make_pair(1000000000, 1000000000)){
      |                                                               ^
/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:54:63: note:   'std::pair<long long int, long long int>' is not derived from 'const std::__cxx11::sub_match<_BiIter>'
   54 |                 if(dist[y] == make_pair(1000000000, 1000000000)){
      |                                                               ^
/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:54:63: note:   'std::pair<int, int>' is not derived from 'const std::__cxx11::sub_match<_BiIter>'
   54 |                 if(dist[y] == make_pair(1000000000, 1000000000)){
      |                                                               ^
/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:54:63: note:   'std::pair<long long int, long long int>' is not derived from 'const std::__cxx11::sub_match<_BiIter>'
   54 |                 if(dist[y] == make_pair(1000000000, 1000000000)){
      |                                                               ^
/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:54:63: note:   'std::pair<long long int, long long int>' is not derived from 'const std::__cxx11::match_results<_BiIter, _Alloc>'
   54 |                 if(dist[y] == make_pair(1000000000, 1000000000)){
      |                                                               ^
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:54:63: note:   deduced conflicting types for parameter '_T1' ('long long int' and 'int')
   54 |                 if(dist[y] == make_pair(1000000000, 1000000000)){
      |                                                               ^
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:54:63: note:   'std::pair<long long int, long long int>' is not derived from 'const std::reverse_iterator<_Iterator>'
   54 |                 if(dist[y] == make_pair(1000000000, 1000000000)){
      |                                                               ^
/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:54:63: note:   'std::pair<long long int, long long int>' is not derived from 'const std::reverse_iterator<_Iterator>'
   54 |                 if(dist[y] == make_pair(1000000000, 1000000000)){
      |                                                               ^
/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:54:63: note:   'std::pair<long long int, long long int>' is not derived from 'const std::move_iterator<_IteratorL>'
   54 |                 if(dist[y] == make_pair(1000000000, 1000000000)){
      |                                                               ^
/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:54:63: note:   'std::pair<long long int, long long int>' is not derived from 'const std::move_iterator<_IteratorL>'
   54 |                 if(dist[y] == make_pair(1000000000, 1000000000)){
      |                                                               ^
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:54:63: note:   'std::pair<long long int, long long int>' is not derived from 'const std::fpos<_StateT>'
   54 |                 if(dist[y] == make_pair(100000