oj.uz

답안 #36362

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
36362 2017-12-08T05:12:20 Z cheater2k Fireworks (APIO16_fireworks) C++14
7 / 100
 6 ms 18580 KB 
#include <bits/stdc++.h>
using namespace std;
 
const int N = 300010;
const long long inf = 1e18;
 
int n, m;
vector< pair<int,int> > G[N];
long long dp[N], tmp[N], dist[N];
int tin[N], tout[N], TIME;
 
// leaf: n + 1 -> n + m
 
bool inside(int fixed, int u) {
	return (tin[fixed] >= tin[u] && tin[fixed] <= tout[u]);
}
 
void dfs(int u) {
	tin[u] = ++TIME;
	for (auto e : G[u]) {
		int v = e.second, c = e.first;
		dist[v] = dist[u] + c;
		dfs(v);
	}
	tout[u] = TIME;
}
 
void solve(int u) {
	for (auto e : G[u]) {
		int v = e.second, c = e.first;
		solve(v);
	}
 
	for (int fixed = n + 1; fixed <= n + m; ++fixed) tmp[fixed] = dp[fixed];
	for (int fixed = n + 1; fixed <= n + m; ++fixed) {
		if (!inside(fixed, u)) continue;
		int pos = 0;
		for (auto e : G[u]) {
			int v = e.second;
			if (inside(fixed, v)) pos = v;
		}
		for (auto e : G[u]) {
			int v = e.second;
			if (pos == v) continue;
			long long mn = inf;
			for (int leaf = n + 1; leaf <= n + m; ++leaf) {
				if (!inside(leaf, v)) continue;
				long long cur = dp[leaf] + abs(dist[leaf] - dist[fixed]);
				mn = min(mn, cur);
			}
			tmp[fixed] += mn;
		}
	}
	for (int fixed = n + 1; fixed <= n + m; ++fixed) {
		if (inside(fixed, u)) dp[fixed] = tmp[fixed];
	}
}
 
int main() {
	ios_base::sync_with_stdio(false); cin.tie(0);
	cin >> n >> m;
	int nNode = n + m;
	for (int i = 2; i <= nNode; ++i) {
		int p, c; cin >> p >> c;
		G[p].push_back(make_pair(c, i));
	}
	dfs(1);
	solve(1);
	long long ans = inf;
	for (int fixed = n + 1; fixed <= n + m; ++fixed) {
		ans = min(ans, dp[fixed]);
	}
	cout << ans << endl;
}

Compilation message

fireworks.cpp: In function 'void solve(int)':
fireworks.cpp:30:21: warning: unused variable 'c' [-Wunused-variable]
   int v = e.second, c = e.first;
                     ^

Subtask #1
7.0 / 7.0

# 결과 실행 시간 메모리 Grader output
1 Correct 6 ms 18580 KB Output is correct
2 Correct 0 ms 18580 KB Output is correct
3 Correct 6 ms 18580 KB Output is correct
4 Correct 0 ms 18580 KB Output is correct
5 Correct 6 ms 18580 KB Output is correct
6 Correct 6 ms 18580 KB Output is correct
7 Correct 0 ms 18580 KB Output is correct
8 Correct 6 ms 18580 KB Output is correct
9 Correct 0 ms 18580 KB Output is correct
10 Correct 0 ms 18580 KB Output is correct

Subtask #2
0 / 19.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 3 ms 18580 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
0 / 29.0

# 결과 실행 시간 메모리 Grader output
1 Correct 6 ms 18580 KB Output is correct
2 Correct 0 ms 18580 KB Output is correct
3 Correct 6 ms 18580 KB Output is correct
4 Correct 0 ms 18580 KB Output is correct
5 Correct 6 ms 18580 KB Output is correct
6 Correct 6 ms 18580 KB Output is correct
7 Correct 0 ms 18580 KB Output is correct
8 Correct 6 ms 18580 KB Output is correct
9 Correct 0 ms 18580 KB Output is correct
10 Correct 0 ms 18580 KB Output is correct
11 Incorrect 3 ms 18580 KB Output isn't correct
12 Halted 0 ms 0 KB -

Subtask #4
0 / 45.0

# 결과 실행 시간 메모리 Grader output
1 Correct 6 ms 18580 KB Output is correct
2 Correct 0 ms 18580 KB Output is correct
3 Correct 6 ms 18580 KB Output is correct
4 Correct 0 ms 18580 KB Output is correct
5 Correct 6 ms 18580 KB Output is correct
6 Correct 6 ms 18580 KB Output is correct
7 Correct 0 ms 18580 KB Output is correct
8 Correct 6 ms 18580 KB Output is correct
9 Correct 0 ms 18580 KB Output is correct
10 Correct 0 ms 18580 KB Output is correct
11 Incorrect 3 ms 18580 KB Output isn't correct
12 Halted 0 ms 0 KB -