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Submission #260869

# Submission time Handle Problem Language Result Execution time Memory
260869 2020-08-11T06:21:30 Z emanIaicepsa Circle selection (APIO18_circle_selection) C++14
0 / 100
 7 ms 5248 KB 
#include<bits/stdc++.h>
using namespace std;
#define ll long long
#define pii pair<ll,ll>
#define vi vector<int>
#define pb emplace_back
#define fi first
#define se second
#define all(n) (n).begin(),(n).end()
#define mem(n,m) memset(n,m,sizeof(n))
#define IOS ios::sync_with_stdio(0), cin.tie(0)
#define dbg(...) cerr<<#__VA_ARGS__<<" = ";_do(__VA_ARGS__);
template<typename A> void _do(A x){cerr<<x<<'\n';}
template<typename A,typename ...B> void _do(A x,B ...y){cerr<<x<<", ";_do(y...);}

ll n,m;
vi E[100005];
ll siz[100005], ans=0;

void dfs(int x,int p){
    siz[x] = 1;
    for(auto i:E[x]){
        if(i==p) continue;
        dfs(i,x);
        siz[x] += siz[i];
    }
}

void dfs2(int x,int p){
    for(auto i:E[x]){
        if(i==p) continue;
        dfs2(i,x);
        ans += siz[i] * (siz[x]-siz[i]-1);
    }
    ans += (siz[x]-1) * (n-siz[x]) * 2;
}

signed main(){
	IOS;
    cin>>n>>m;
    for(int i=1,a,b;i<=m;i++){
        cin>>a>>b;
        E[a].pb(b);
        E[b].pb(a);
    }

    dfs(1,0);
    dfs2(1,0);

    cout<<ans<<'\n';

}

Subtask #1
0 / 7.0

# Verdict Execution time Memory Grader output
1 Runtime error 6 ms 5248 KB Execution killed with signal 11 (could be triggered by violating memory limits)
2 Halted 0 ms 0 KB -

Subtask #2
0 / 12.0

# Verdict Execution time Memory Grader output
1 Incorrect 2 ms 2688 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
0 / 15.0

# Verdict Execution time Memory Grader output
1 Runtime error 7 ms 5248 KB Execution killed with signal 11 (could be triggered by violating memory limits)
2 Halted 0 ms 0 KB -

Subtask #4
0 / 23.0

# Verdict Execution time Memory Grader output
1 Incorrect 2 ms 2688 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #5
0 / 30.0

# Verdict Execution time Memory Grader output
1 Runtime error 6 ms 5248 KB Execution killed with signal 11 (could be triggered by violating memory limits)
2 Halted 0 ms 0 KB -

Subtask #6
0 / 13.0

# Verdict Execution time Memory Grader output
1 Runtime error 6 ms 5248 KB Execution killed with signal 11 (could be triggered by violating memory limits)
2 Halted 0 ms 0 KB -