oj.uz

답안 #952014

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
952014 2024-03-23T03:45:27 Z vjudge1 Museum (CEOI17_museum) C++17
80 / 100
 3000 ms 757212 KB 
#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using pii = pair<int, int>;
const int N = 1e4 + 2;
int n, k, x;
int dp[N][N][2], son[N];
vector<pii> g[N];
void dfs(int u, int fa) {
	son[u] = 1;
	dp[u][1][0] = dp[u][1][1] = 0;
	for (pii f : g[u]) {
		int v = f.first, w = f.second;
		if (v == fa) continue;
		dfs(v, u);
		son[u] += son[v];
		for (int i = min(son[u], k); i >= 0; i--) {
			for (int j = 0; j <= min(son[v], i - 1); j++) {
				dp[u][i][0] = min(dp[u][i][0], dp[u][i - j][0] + dp[v][j][0] + w * 2);
				dp[u][i][1] = min(dp[u][i][1], dp[u][i - j][0] + dp[v][j][1] + w);
				dp[u][i][1] = min(dp[u][i][1], dp[u][i - j][1] + dp[v][j][0] + w * 2);
			}
		}
	}
}
int main() {
	scanf("%d%d%d", &n, &k, &x);
	for (int i = 1; i < n; i++) {
		int u, v, w;
		scanf("%d%d%d", &u, &v, &w);
		g[u].push_back({v, w});
		g[v].push_back({u, w});
	}
	for (int i = 1; i <= n; i++) {
		for (int j = 0; j <= k; j++) {
			dp[i][j][0] = dp[i][j][1] = 0x3f3f3f3f;
		}
	}
	dfs(x, -1);
	printf("%d\n", min(dp[x][k][0], dp[x][k][1]));
}

Compilation message

museum.cpp: In function 'int main()':
museum.cpp:27:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   27 |  scanf("%d%d%d", &n, &k, &x);
      |  ~~~~~^~~~~~~~~~~~~~~~~~~~~~
museum.cpp:30:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   30 |   scanf("%d%d%d", &u, &v, &w);
      |   ~~~~~^~~~~~~~~~~~~~~~~~~~~~

Subtask #1
20.0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 2648 KB Output is correct
2 Correct 1 ms 2652 KB Output is correct
3 Correct 1 ms 2652 KB Output is correct
4 Correct 1 ms 2652 KB Output is correct
5 Correct 1 ms 2648 KB Output is correct

Subtask #2
25.0 / 25.0

# 결과 실행 시간 메모리 Grader output
1 Correct 64 ms 261608 KB Output is correct
2 Correct 50 ms 263764 KB Output is correct
3 Correct 86 ms 265808 KB Output is correct
4 Correct 69 ms 269396 KB Output is correct
5 Correct 60 ms 273232 KB Output is correct

Subtask #3
35.0 / 35.0

# 결과 실행 시간 메모리 Grader output
1 Correct 64 ms 261608 KB Output is correct
2 Correct 50 ms 263764 KB Output is correct
3 Correct 86 ms 265808 KB Output is correct
4 Correct 69 ms 269396 KB Output is correct
5 Correct 60 ms 273232 KB Output is correct
6 Correct 47 ms 269396 KB Output is correct
7 Correct 83 ms 271440 KB Output is correct
8 Correct 50 ms 269396 KB Output is correct
9 Correct 48 ms 269396 KB Output is correct
10 Correct 48 ms 271440 KB Output is correct

Subtask #4
0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 2648 KB Output is correct
2 Correct 1 ms 2652 KB Output is correct
3 Correct 1 ms 2652 KB Output is correct
4 Correct 1 ms 2652 KB Output is correct
5 Correct 1 ms 2648 KB Output is correct
6 Correct 64 ms 261608 KB Output is correct
7 Correct 50 ms 263764 KB Output is correct
8 Correct 86 ms 265808 KB Output is correct
9 Correct 69 ms 269396 KB Output is correct
10 Correct 60 ms 273232 KB Output is correct
11 Correct 47 ms 269396 KB Output is correct
12 Correct 83 ms 271440 KB Output is correct
13 Correct 50 ms 269396 KB Output is correct
14 Correct 48 ms 269396 KB Output is correct
15 Correct 48 ms 271440 KB Output is correct
16 Correct 130 ms 318804 KB Output is correct
17 Correct 703 ms 539216 KB Output is correct
18 Correct 1876 ms 318968 KB Output is correct
19 Correct 125 ms 318756 KB Output is correct
20 Correct 108 ms 320636 KB Output is correct
21 Execution timed out 3059 ms 757212 KB Time limit exceeded
22 Halted 0 ms 0 KB -