제출 #1246425

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1246425		CodeLakVN	Transport (COCI19_transport)	C++17	0 / 100	0 ms	0 KiB

Main

#include <bits/stdc++.h>
using namespace std;

#define task "main"
#define no "NO"
#define yes "YES"
#define F first
#define S second
#define vec vector
#define _mp make_pair
#define ii pair<int, int>
#define sz(x) (int)x.size()
#define all(x) x.begin(), x.end()
#define evoid(val) return void(std::cout << val)
#define FOR(i, a, b) for(int i = (a); i <= (b); ++i)
#define FOD(i, b, a) for(int i = (b); i >= (a); --i)

const int MAX_N = (int)1e5 + 5;

int numNode;
int a[MAX_N];
vector<ii> adj[MAX_N];

namespace sub1 {
    bool valid() {
        return numNode <= 5000;
    }

    int ans = 0;

    void dfs(int u, int p, long long sum) {
        sum += a[u];
        for (ii e : adj[u]) {
            int v = e.F, w = e.S;
            if (v == p) continue;
            if (sum < w) continue;
            ans++;
            dfs(v, u, sum - w);
        }
    }

    void solve() {
        FOR(u, 1, numNode) dfs(u, -1, 0);
        cout << ans << "\n";
    }
}

namespace sub2 {
    bool valid() {
        FOR(i, 1, numNode) if ((int)adj[i].size() > 2) return false;
        return true;
    }

    long long ans = 0;

    int d[MAX_N];

    void solve() {
        FOR(i, 1, numNode - 1) {
            for (ii e : adj[i]) if (e.F != i - 1) d[i + 1] = e.S;
        }
        int l = 1;
        long long sum = a[1];

        FOR(i, 2, numNode) {
            if (sum < d[i]) sum = 0, l = i;
            else {
                sum -= d[i];
                ans += (i - l);
            }
            sum += a[i];
        }

        cout << ans << "\n";
    }
}

void solve() {
    cin >> numNode;
    FOR(i, 1, numNode) cin >> a[i];
    FOR(i, 1, numNode - 1) {
        int u, v, w;
        cin >> u >> v >> w;
        adj[u].push_back({v, w});
        adj[v].push_back({u, w});
    }

    if (sub1::valid()) sub1::solve();
}

int32_t main() {
    if (fopen(task".inp", "r")) {
        freopen(task".inp", "r", stdin);
        freopen(task".out", "w", stdout);
    }
    ios_base::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);

    bool multitest = 0;
    int numTest = 1;
    if (multitest) cin >> numTest;

    while (numTest--) {
        solve();
    }

    return 0;
}

/* Lak lu theo dieu nhac!!!! */

컴파일 시 표준 에러 (stderr) 메시지

Main.cpp: In function 'int32_t main()':
Main.cpp:93:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   93 |         freopen(task".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:94:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   94 |         freopen(task".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 100