제출 #489907

#	제출 시각UTC-0	아이디	문제	언어	결과	실행 시간	메모리
489907	2021-11-25 03:58:49	SirCovidThe19th	Pipes (BOI13_pipes)	C++17	100 / 100	399 ms	54872 KiB

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#include <bits/stdc++.h>
using namespace std;
#define FOR(i, x, y) for (int i = x; i < y; i++)
#define pii pair<int, int>
#define f first
#define s second
const int mN = 1e5 + 5, mM = 5e5 + 5;
int n, m, cnt, st; long long A[mN], ans[mM], altSm; bool vis[mN]; set<pii> adj[mN]; 
void compressLeaves(){
    queue<int> q; 
    FOR(i, 0, n) if (adj[i].size() == 1) q.push(i);
    while (!q.empty()){
        int cur = q.front(); q.pop();
        if (adj[cur].empty()) continue;
        pii nxt = *adj[cur].begin(); 
        ans[nxt.s] = A[cur] * 2; A[nxt.f] -= A[cur];
        adj[cur].clear(); adj[nxt.f].erase({cur, nxt.s}); 
        if (adj[nxt.f].size() == 1) q.push(nxt.f);
    }
}
void dfs(int cur, bool parity){
    altSm += !parity ? A[cur] : -A[cur]; vis[cur] = 1;
    for (pii nxt : adj[cur]) if (!vis[nxt.f]){
        dfs(nxt.f, !parity);
    }
 
 
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• Subtask 1: 30 / 30
• Subtask 2: 70 / 70