Submission #472350

#	Time	Username	Problem	Language	Result	Execution time	Memory
472350		morasha3	Toll (BOI17_toll)	C++17	0 / 100	60 ms	7004 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],dis[50007];
void dfs(ll idx,ll cnt)
{
    vis[idx]=1;
    if(dis[idx]!=-1)
    dis[idx]=min(dis[idx],cnt);
    else dis[idx]=cnt;
    for(int i=0; i<v[idx].size(); i++)
    {
        if(dis[v[idx][i].first]!=-1)
        dis[v[idx][i].first]=min(dis[v[idx][i].first],cnt+v[idx][i].second);
        else dis[v[idx][i].first]=cnt+v[idx][i].second;
        if(vis[v[idx][i].first]==0)
            dfs(v[idx][i].first,cnt+v[idx][i].second);

    }
}

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});
    }
    memset(dis,-1,sizeof dis);
    dfs(0,0);

    for(int i=0; i<q; i++)
    {


        ll a,b;
        ans=INT_MAX;
        cin>>a>>b;
    if(dis[b]==-1)ans=-1;
    else ans=dis[b];
        cout<<ans<<endl;
    }
}

Compilation message (stderr)

toll.cpp: In function 'void dfs(ll, ll)':
toll.cpp:15:19: 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]
   15 |     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