提出 #62768293

ソースコード 拡げる

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#include <bits/stdc++.h>
using namespace std;
#define ull unsigned long long
#define ll long long
#define pii array<int,2>
#define endl "\n"
void solve() {
    int n,m;
    cin >> n >> m;
    int ans = 0;
    set<pii> edge;
    for (int i = 0; i < m; i++) {
        int u,v;
        cin >> u >> v;
        if (u > v) swap(u,v);
        if (u == v || edge.count({u,v})) ans++;
        else edge.insert({u,v});
    }
    cout << ans << endl;
 
 
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#include <bits/stdc++.h>
using namespace std;

#define ull unsigned long long
#define ll long long
#define pii array<int,2>
#define endl "\n"

void solve() {
    int n,m;
    cin >> n >> m;
    int ans = 0;
    set<pii> edge;
    for (int i = 0; i < m; i++) {
        int u,v;
        cin >> u >> v;
        if (u > v) swap(u,v);
        if (u == v || edge.count({u,v})) ans++;
        else edge.insert({u,v});
    }
    cout << ans << endl;
}

signed main() {
    ios::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    int t = 1;
    for (int i = 0; i < t; i++) {
        solve();
    }
    return 0;
}

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ジャッジ結果