Submission #337254

#	Time	Username	Problem	Language	Result	Execution time	Memory
337254		impri	Bridges (APIO19_bridges)	C++14	13 / 100	3093 ms	9264 KiB

bridges

#include<bits/stdc++.h>
using namespace std;
vector<pair<int,int> >graph[50001];
int ds[100001];
int visited[100001];
void dfs(int w,int cur){
visited[cur]=1;
for(int i=0;i<graph[cur].size();i++){
    if(!visited[graph[cur][i].first] && ds[graph[cur][i].second]>=w){
        dfs(w,graph[cur][i].first);
    }
}

}
int main(){
int n,m;
cin >> n >> m;
for(int i=1;i<=m;i++){
    int u,v,d;
    cin >> u >> v >> d;
    graph[u].push_back({v,i});
    graph[v].push_back({u,i});
    ds[i]=d;
}
int q;
cin >> q;
for(int i=1;i<=q;i++){
    int t,a,b;
    cin >> t >> a >> b;
    if(t==1){
        ds[a]=b;
    }
    else{
        memset(visited,0,sizeof(visited));
        dfs(b,a);
        int res=0;
        for(int j=1;j<=n;j++){
            if(visited[j])res++;
        }
        cout << res << '\n';
    }
}
}

Compilation message (stderr)

bridges.cpp: In function 'void dfs(int, int)':
bridges.cpp:8:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
    8 | for(int i=0;i<graph[cur].size();i++){
      |             ~^~~~~~~~~~~~~~~~~~

• Subtask 1: 13 / 13
• Subtask 2: 0 / 16
• Subtask 3: 0 / 17
• Subtask 4: 0 / 14
• Subtask 5: 0 / 13
• Subtask 6: 0 / 27