Submission #472317

#	Time	Username	Problem	Language	Result	Execution time	Memory
472317		morasha3	Toll (BOI17_toll)	C++17	0 / 100	57 ms	4412 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;
     ll vis[50007];
    void dfs(ll idx,ll cnt,ll e)
    {
        vis[idx]=1;
        if(idx==e)
        {
            ans=min(cnt,ans);
            return;
        }
        for(int i=0;i<v[idx].size();i++)
        {
            if(vis[v[idx][i].first]==0)
                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;
     memset(vis,0,sizeof vis);
        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;
            if(b>a)
            {
                cout<<-1<<endl;
                continue;
            }
            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:17:22: 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]
   17 |         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