oj.uz

답안 #120429

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
120429 2019-06-24T12:51:24 Z popovicirobert Dynamite (POI11_dyn) C++14
100 / 100
 2009 ms 35832 KB 
#include <bits/stdc++.h>
#define ll long long
#define ull unsigned long long
#define lsb(x) (x & (-x)) 

using namespace std;

const int INF = 1e9;
const int MAXN = (int) 3e5;

vector <int> g[MAXN + 1];
int dyn[MAXN + 1];
int dp1[MAXN + 1]; // cel mai departat TNT neexplodat
int dp2[MAXN + 1]; // cel mai apropiat nod selectat
int cnt;

void dfs(int nod, int par, int len) {
	dp1[nod] = (dyn[nod] ? 0 : -INF);
	dp2[nod] = -INF;
	for(auto it : g[nod]) {
		if(it != par) {
			dfs(it, nod, len);
			dp1[nod] = max(dp1[nod], dp1[it] + 1);
			dp2[nod] = max(dp2[nod], dp2[it] - 1);
		}
	}

	if(dp1[nod] <= dp2[nod]) dp1[nod] = -INF;
	if(dp1[nod] >= len) {
		dp1[nod] = -INF;
		cnt++;
		dp2[nod] = len;
	}
}

int main() {
	//ifstream cin("A.in");
	//ofstream cout("A.out");
	int i, n, m;
	ios::sync_with_stdio(false);
	cin.tie(0), cout.tie(0);
	
	cin >> n >> m;

	for(i = 1; i <= n; i++) {
		cin >> dyn[i];
	}

	for(i = 1; i < n; i++) {
		int x, y;
		cin >> x >> y;
		g[x].push_back(y);
		g[y].push_back(x);
	}

	int res = -1;
	for(int step = 1 << 18; step; step >>= 1) {
		cnt = 0;
		dfs(1, 0, res + step);
		cnt += (dp1[1] >= 0);
		if(cnt > m) {
			res += step;
		}
	}

	cout << res + 1;

	return 0;
}

Subtask #1
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 8 ms 7424 KB Output is correct
2 Correct 8 ms 7424 KB Output is correct
3 Correct 8 ms 7424 KB Output is correct
4 Correct 7 ms 7424 KB Output is correct

Subtask #2
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 8 ms 7344 KB Output is correct
2 Correct 8 ms 7424 KB Output is correct
3 Correct 8 ms 7424 KB Output is correct

Subtask #3
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 8 ms 7424 KB Output is correct
2 Correct 8 ms 7424 KB Output is correct

Subtask #4
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 8 ms 7424 KB Output is correct
2 Correct 8 ms 7424 KB Output is correct

Subtask #5
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 16 ms 8064 KB Output is correct
2 Correct 43 ms 8696 KB Output is correct
3 Correct 45 ms 9088 KB Output is correct
4 Correct 61 ms 10800 KB Output is correct

Subtask #6
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 55 ms 10492 KB Output is correct
2 Correct 95 ms 11648 KB Output is correct
3 Correct 376 ms 11924 KB Output is correct
4 Correct 277 ms 14840 KB Output is correct

Subtask #7
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 280 ms 13304 KB Output is correct
2 Correct 258 ms 13432 KB Output is correct
3 Correct 522 ms 13048 KB Output is correct
4 Correct 605 ms 18376 KB Output is correct

Subtask #8
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 902 ms 19276 KB Output is correct
2 Correct 1136 ms 21520 KB Output is correct
3 Correct 1667 ms 29360 KB Output is correct
4 Correct 1585 ms 29360 KB Output is correct

Subtask #9
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1953 ms 27468 KB Output is correct
2 Correct 1454 ms 25764 KB Output is correct
3 Correct 2005 ms 30328 KB Output is correct

Subtask #10
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1759 ms 33756 KB Output is correct
2 Correct 1345 ms 25744 KB Output is correct
3 Correct 2009 ms 35832 KB Output is correct
4 Correct 620 ms 26056 KB Output is correct