Submission #393245

#	Time	Username	Problem	Language	Result	Execution time	Memory
393245		parsabahrami	Duathlon (APIO18_duathlon)	C++17	0 / 100	59 ms	9208 KiB

count_triplets

/* There's someone in my head but it's not me */ 
#include <bits/stdc++.h>
 
using namespace std;

typedef long long int ll;
typedef pair<int, int> pii;

#define SZ(x)                       (int) x.size()
#define F                           first
#define S                           second

const int N = 1e5 + 10, MOD = 1e9 + 7;
int s, n, m, M[N]; vector<int> adj[N];

void DFS(int v) {
    s++;
    M[v] = 1;
    for (int u : adj[v]) 
        if (!M[u]) DFS(u);
}

int main() {
    scanf("%d%d", &n, &m);
    for (int i = 1; i <= m; i++) {
        int u, v; scanf("%d%d", &u, &v);
        adj[u].push_back(v);
        adj[v].push_back(u);
    }
    ll ret = 0;
    for (int i = 1; i <= n; i++) {
        if (M[i]) continue;
        s = 0; 
        DFS(i);
        ret += s * (s - 1) * (s - 2);
    }
    printf("%lld\n", ret);
    return 0;
}

Compilation message (stderr)

count_triplets.cpp: In function 'int main()':
count_triplets.cpp:24:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   24 |     scanf("%d%d", &n, &m);
      |     ~~~~~^~~~~~~~~~~~~~~~
count_triplets.cpp:26:24: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   26 |         int u, v; scanf("%d%d", &u, &v);
      |                   ~~~~~^~~~~~~~~~~~~~~~

• Subtask 1: 0 / 5
• Subtask 2: 0 / 11
• Subtask 3: 0 / 8
• Subtask 4: 0 / 10
• Subtask 5: 0 / 13
• Subtask 6: 0 / 15
• Subtask 7: 0 / 20
• Subtask 8: 0 / 8
• Subtask 9: 0 / 10