Submission #472224

#	Time	Username	Problem	Language	Result	Execution time	Memory
472224		morasha3	Toll (BOI17_toll)	C++17	0 / 100	3095 ms	5648 KiB

toll

#include<bits/stdc++.h>
typedef long long ll;
const ll mod = (ll) 1e9 + 7;
const ll mx = (ll) 1e5 +7;
using namespace std;
vector<vector<pair<ll,ll>>>v(50007);
ll k,n,q,m,ans=0;

void dfs(ll idx,ll cnt,ll e)
{
    if(idx==e)
    {
        ans=min(cnt,ans);
        return;
    }
    for(int i=0;i<v[idx].size();i++)
    {

            dfs(v[idx][i].first,cnt+v[idx][i].second,e);

    }
}

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);

    cin>>k>>n>>m>>q;

    for(int i=0;i<m;i++)
    {
        ll a,b,c;
        cin>>a>>b>>c;
        v[a].push_back({b,c});
    }
    for(int i=0;i<q;i++)
    {


        ll a,b;
        ans=INT_MAX;
        cin>>a>>b;
        dfs(a,0,b);
        if(ans==INT_MAX)ans=-1;
        cout<<ans<<endl;
    }
}

Compilation message (stderr)

toll.cpp: In function 'void dfs(ll, ll, ll)':
toll.cpp:16:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   16 |     for(int i=0;i<v[idx].size();i++)
      |                 ~^~~~~~~~~~~~~~

• Subtask 1: 0 / 7
• Subtask 2: 0 / 10
• Subtask 3: 0 / 8
• Subtask 4: 0 / 31
• Subtask 5: 0 / 44