oj.uz

Submission #43260

# Submission time Handle Problem Language Result Execution time Memory
43260 2018-03-11T21:28:04 Z smu201111192 우호 조약 체결 (JOI14_friends) C++14
0 / 100
 54 ms 11228 KB 
#include <iostream>
#include <cstdio>
#include <cassert>
#include <bitset>
#include <string>
#include <sstream>
#include <algorithm>
#include <set>
#include <numeric>
#include <cmath>
#include <map>
#include <vector>
#include <queue>
#include <stack>
#include <cstring>
#include <queue>
#include <numeric>
#include <iomanip>
#define ll long long
using namespace std;
const int MAXN = 400001;
int n,m,vis[MAXN],parent[MAXN],sz[MAXN];
vector<int> adj[MAXN];
int find(int u) { return u == parent[u] ? u : parent[u] = find(parent[u]); }
void mrg(int u,int v){
    u = find(u) , v = find(v);
    if(u == v)return;
    parent[u] = v;
    sz[v] += sz[u];
}
void dfs(int here,int root){
    vis[here] = 1;
    for(auto x:adj[here]){
        if(vis[x]) mrg(root,x);
        else{
            mrg(root,x);
            dfs(x,root);
        }
    }
}
int main(){
    ios::sync_with_stdio(false); cin.tie(0);
    cin >> n >> m;
    for(int i = 1; i <= n; i++){
        parent[i] = i;
        sz[i] = 1;
    }
    for(int i = 1; i <= m; i++){
        int u,v; cin >> u >> v;
        adj[u].push_back(v);
    }
    for(int i = 1; i <= n; i++){
        if(adj[i].size() >= 2 && !vis[i]){
            dfs(i,adj[i].front());
        }
    }
    long long ans = 0;
    for(int i = 1; i <= n; i++)if(i == find(i)) ans += 1LL * sz[i] * (sz[i] - 1);
    for(int i = 1; i <= n; i++){
        for(auto x:adj[i]){
            if(find(i) != find(x)) ans++;
            else ans--;
        }
    }
    cout<<ans;
    return 0;
}

Subtask #1
0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 8 ms 9720 KB Output is correct
2 Correct 10 ms 9720 KB Output is correct
3 Correct 8 ms 9748 KB Output is correct
4 Incorrect 9 ms 9932 KB Output isn't correct
5 Halted 0 ms 0 KB -

Subtask #2
0 / 30.0

# Verdict Execution time Memory Grader output
1 Incorrect 10 ms 10132 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
0 / 65.0

# Verdict Execution time Memory Grader output
1 Incorrect 54 ms 11228 KB Output isn't correct
2 Halted 0 ms 0 KB -