Language: C++

#include <bits/stdc++.h>
#pragma GCC optimize("O3")
#define REP(i,n) for(int i=0;i<n;i++)
#define REPP(i,n) for(int i=1;i<=n;i++)
#define ALL(obj) (obj).begin(), (obj).end()
#define EPS (1e-9)
#define INF (1e17)
#define PI (acos(-1))
//const double PI = acos(-1);
//const double EPS = 1e-15;
//long long INF=(long long)1E17;
#define i_7 (long long)(1e9+7)
//#define i_7 998'244'353
long mod(long a){
    long long c=a%i_7;
    if(c>=0)return c;
    return c+i_7;
}
using namespace std;

bool prime_(int n){
  if(n==1){
    return false;
  }else if(n==2){
    return true;
  }else{
    for(int i=2;i<=sqrt(n);i++){
      if(n%i==0){
        return false;
      }
    }
    return true;
  }
}

long long gcd_(long long a, long long b){
  if(a<b){
    swap(a,b);
  }
  if(a%b==0){
    return b;
  }else{
    return gcd_(b,a%b);
  }
}
 
long long lcm_(long long x, long long y){
  return (x/gcd_(x,y))*y;
}

vector<int> G[300];

int main(){
  
  int n,m;
  long long l;
  cin>>n>>m>>l;
  
  int a,b;
  long long c;
  //long long w[n][n];
  vector<vector<long long>> dist(n, vector<long long>(n, INF));
  REP(i,n){
    dist[i][i] = 0;
  }
  REP(i,m){
    cin>>a>>b>>c;
    a--;b--;
    if(c>=l)continue;
    //G[a].push_back(b);
    //G[b].push_back(a);
    //w[a][b] = w[b][a] = c;
    dist[a][b] = dist[b][a] = c;
  }
  
  REP(k,n){
    REP(i,n){
      REP(j,n){
        if(dist[i][j] > dist[i][k] + dist[k][j]){
          dist[i][j] = dist[i][k] + dist[k][j];
        }
      }
    }
  }
  /*
  vector<vector<int>> next_(n, vector<int>(n, -1));
  REP(i,n){
    REP(j,n){
      for(int k:G[i]){
        if(dist[i][k] + dist[k][j] == dist[i][j]){
          next_[i][j] = k;
        }
      }
    }
  }
  */
  
  vector<vector<long long>> dist2(n, vector<long long>(n, INF));
  REP(i,n){
    dist2[i][i] = 0;
  }
  REP(i,n){
    REP(j,n){
      if(dist[i][j] < l){
        dist2[i][j] = 1;
      }
    }
  }
  
  REP(k,n){
    REP(i,n){
      REP(j,n){
        if(dist2[i][j] > dist2[i][k] + dist2[k][j]){
          dist2[i][j] = dist2[i][k] + dist2[k][j];
        }
      }
    }
  }
  
  int q;
  cin>>q;
  int s,t;
  REP(i,q){
    cin>>s>>t;
    s--;t--;
    if(dist[s][t] == INF){
      cout<<-1<<endl;
      continue;
    }

    long long res;
    /*
    int now = s;
    long long cap = l;
    while(now != t){
      int n = next_[now][t];
      if(w[now][n]>=cap){
        res++;
        cap = l;
        cap -= w[now][n];
      }else{
        cap -= w[now][n];
      }
      now = n;
    }
    */
    
    res = dist2[s][t];
    res = max(0,res-1);
    cout<<res<<endl;
  }
  
  return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:149:14: error: no matching function for call to 'max(int, long long int)'
  149 |     res = max(0,res-1);
      |           ~~~^~~~~~~~~
In file included from /usr/include/c++/14/algorithm:60,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:51,
                 from a.cc:1:
/usr/include/c++/14/bits/stl_algobase.h:257:5: note: candidate: 'template<class _Tp> constexpr const _Tp& std::max(const _Tp&, const _Tp&)'
  257 |     max(const _Tp& __a, const _Tp& __b)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:257:5: note:   template argument deduction/substitution failed:
a.cc:149:14: note:   deduced conflicting types for parameter 'const _Tp' ('int' and 'long long int')
  149 |     res = max(0,res-1);
      |           ~~~^~~~~~~~~
/usr/include/c++/14/bits/stl_algobase.h:303:5: note: candidate: 'template<class _Tp, class _Compare> constexpr const _Tp& std::max(const _Tp&, const _Tp&, _Compare)'
  303 |     max(const _Tp& __a, const _Tp& __b, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:303:5: note:   candidate expects 3 arguments, 2 provided
In file included from /usr/include/c++/14/algorithm:61:
/usr/include/c++/14/bits/stl_algo.h:5706:5: note: candidate: 'template<class _Tp> constexpr _Tp std::max(initializer_list<_Tp>)'
 5706 |     max(initializer_list<_Tp> __l)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5706:5: note:   candidate expects 1 argument, 2 provided
/usr/include/c++/14/bits/stl_algo.h:5716:5: note: candidate: 'template<class _Tp, class _Compare> constexpr _Tp std::max(initializer_list<_Tp>, _Compare)'
 5716 |     max(initializer_list<_Tp> __l, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5716:5: note:   template argument deduction/substitution failed:
a.cc:149:14: note:   mismatched types 'std::initializer_list<_Tp>' and 'int'
  149 |     res = max(0,res-1);
      |           ~~~^~~~~~~~~