oj.uz

답안 #492807

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
492807 2021-12-09T02:47:17 Z ntabc05101 Museum (CEOI17_museum) C++14
80 / 100
 601 ms 1048580 KB 
#include<bits/stdc++.h>
using namespace std;

#define taskname ""

const long long inf = 1e18;
const int mxN = 10002;

int n, k, x;
vector< pair<int, int> > adj[mxN];
int sz[mxN];
long long dp[mxN][mxN][2];

void dfs(int u, int p = -1) {
	sz[u] = 1;
	for (int i = 2; i <= k; i++) {
		dp[u][i][0] = dp[u][i][1] = inf;
	}
	vector<long long> res(1, 0);
	for (auto &to: adj[u]) {
		if (to.first != p) {
			dfs(to.first, u);
			for (int i = min(sz[u] + sz[to.first], k); i > 1; i--) {
				for (int j = min(sz[to.first] , i - 1); j >= max(1, i - sz[u]); j--) {
					dp[u][i][1] = min({dp[u][i][1], dp[u][i - j][1] + dp[to.first][j][0] + (to.second << 1), dp[u][i - j][0] + dp[to.first][j][1] + to.second});
					dp[u][i][0] = min({dp[u][i][0], dp[u][i - j][0] + dp[to.first][j][0] + (to.second << 1)});
				}
			}
			sz[u] += sz[to.first];
		}
	}
}

int main() {
	if (fopen(taskname".inp", "r")) {
		freopen(taskname".inp", "r", stdin);
		freopen(taskname".out", "w", stdout);
	}
	else {
		if (fopen(taskname".in", "r")) {
			freopen(taskname".in", "r", stdin);
			freopen(taskname".out", "w", stdout);
		}
	}

	cin.tie(0)->sync_with_stdio(0);

	cin >> n >> k >> x; x--;
	for (int i = 0, x, y, w; i < n - 1; i++) {
		cin >> x >> y >> w; x--; y--;
		adj[x].push_back({y, w});
		adj[y].push_back({x, w});
	}

	dfs(x);

	cout << dp[x][k][1] << "\n";

	return 0;
}

Compilation message

museum.cpp: In function 'int main()':
museum.cpp:36:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   36 |   freopen(taskname".inp", "r", stdin);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
museum.cpp:37:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   37 |   freopen(taskname".out", "w", stdout);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
museum.cpp:41:11: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   41 |    freopen(taskname".in", "r", stdin);
      |    ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~
museum.cpp:42:11: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   42 |    freopen(taskname".out", "w", stdout);
      |    ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
20.0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 588 KB Output is correct
2 Correct 1 ms 588 KB Output is correct
3 Correct 1 ms 588 KB Output is correct
4 Correct 1 ms 564 KB Output is correct
5 Correct 1 ms 560 KB Output is correct

Subtask #2
25.0 / 25.0

# 결과 실행 시간 메모리 Grader output
1 Correct 34 ms 59460 KB Output is correct
2 Correct 33 ms 59404 KB Output is correct
3 Correct 35 ms 59916 KB Output is correct
4 Correct 43 ms 59332 KB Output is correct
5 Correct 36 ms 59072 KB Output is correct

Subtask #3
35.0 / 35.0

# 결과 실행 시간 메모리 Grader output
1 Correct 34 ms 59460 KB Output is correct
2 Correct 33 ms 59404 KB Output is correct
3 Correct 35 ms 59916 KB Output is correct
4 Correct 43 ms 59332 KB Output is correct
5 Correct 36 ms 59072 KB Output is correct
6 Correct 33 ms 59480 KB Output is correct
7 Correct 40 ms 59828 KB Output is correct
8 Correct 37 ms 59504 KB Output is correct
9 Correct 38 ms 59408 KB Output is correct
10 Correct 33 ms 59468 KB Output is correct

Subtask #4
0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 588 KB Output is correct
2 Correct 1 ms 588 KB Output is correct
3 Correct 1 ms 588 KB Output is correct
4 Correct 1 ms 564 KB Output is correct
5 Correct 1 ms 560 KB Output is correct
6 Correct 34 ms 59460 KB Output is correct
7 Correct 33 ms 59404 KB Output is correct
8 Correct 35 ms 59916 KB Output is correct
9 Correct 43 ms 59332 KB Output is correct
10 Correct 36 ms 59072 KB Output is correct
11 Correct 33 ms 59480 KB Output is correct
12 Correct 40 ms 59828 KB Output is correct
13 Correct 37 ms 59504 KB Output is correct
14 Correct 38 ms 59408 KB Output is correct
15 Correct 33 ms 59468 KB Output is correct
16 Correct 105 ms 200080 KB Output is correct
17 Correct 506 ms 825012 KB Output is correct
18 Correct 123 ms 200224 KB Output is correct
19 Correct 145 ms 200076 KB Output is correct
20 Correct 123 ms 200052 KB Output is correct
21 Runtime error 601 ms 1048580 KB Execution killed with signal 9
22 Halted 0 ms 0 KB -