提出 #30082435

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ソースコード 拡げる

// #include <atcoder/all>
// using namespace atcoder;
// using mint = modint998244353;
// using mint = modint1000000007;
#include <bits/stdc++.h>
#define all(v) (v).begin(), (v).end()
#define rall(v) (v).rbegin(), (v).rend()
#define rep(i,n) for (int i = 0; i < (n); ++i)
#define rep2(i,k,n) for (int i = (k); i < (n); ++i)
using namespace std;
using ll = long long;
// using P = pair<ll,ll>;
using P = pair<int,int>;
using vint = vector<int>;
using vll = vector<ll>;
using vvint = vector<vector<int>>;
using vvll = vector<vector<ll>>;

const ll INF = (ll)2e18+9;
// const int INF = (int)2e9+7;
// const ll MOD = (ll)1e9+9;
template<typename T>
void chmin(T &a, T b) { a = min(a, b); }
template<typename T>
void chmax(T &a, T b) { a = max(a, b); }

template<typename T>
void print(vector<T> v) {
    int n = v.size();
    rep(i,n) {
        if (i == 0) cout << v[i];
        else cout << ' ' << v[i];
    }
    cout << endl;
}

struct Path {
    ll from, to, cost;
};

void solve() {
    int n, m;
    cin >> n >> m;
    vvll dist(n, vll(n, INF));

    vector<Path> paths;
    rep(i,m) {
        ll a, b, c;
        cin >> a >> b >> c;
        a--, b--;
        dist[a][b] = dist[b][a] = c;
        paths.push_back({a, b, c});
    }

    rep(k,n) rep(i,n) rep(j,n) chmin(dist[i][j], dist[i][k] + dist[k][j]);

    ll ans = 0;
    for (auto [from, to, cost] : paths) {
        int unused = 0;
        rep(i,n) {
            if (dist[from][i] + dist[i][to] <= cost) {
                unused = 1;
            }
        }
        ans += unused;
    }

    cout << ans << endl;
}

int main() {
    solve();
    return 0;
}

提出情報

ジャッジ結果