oj.uz

Submission #311610

# Submission time Handle Problem Language Result Execution time Memory
311610 2020-10-10T18:53:48 Z bigg Chase (CEOI17_chase) C++14
70 / 100
 315 ms 99544 KB 
#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
const int MAXN = 1e5 + 10;
const int MAXK = 110;
ll dp[MAXN][MAXK];
ll s[MAXN], a[MAXN];
int crum;
vector<int> grafo[MAXN];
void dfs(int x, int p){
	for(int i = 0; i <= crum; i++) dp[x][i] = 0;
	for(int i = 0; i < grafo[x].size(); i++){
		int viz = grafo[x][i];
		if(viz == p) continue;
		dfs(viz, x);

		for(int k = 1; k <= crum; k++){
			dp[x][k] = max(dp[viz][k], dp[x][k]);
			dp[x][k] = max(dp[x][k], dp[viz][k-1] + s[x] - a[p]); 
		}
	}
}
int n;
int main(){
	scanf("%d %d", &n, &crum);
	if(crum == 0){
		printf("0\n" );
		return 0;
	}
	for(int i = 1; i <= n; i++) scanf("%lld", &a[i]);
	for(int i = 1; i < n; i++){
		int u, v;
		scanf("%d %d", &u, &v);
		grafo[u].push_back(v);
		grafo[v].push_back(u);
		s[u] += a[v];
		s[v] += a[u];
	}
	ll ans = 0;
	if(n <= 1000){
		for(int i = 1; i <= n; i++){
			dfs(i, 0);
			ans = max(ans, dp[i][crum]);
		}
	}else{
		dfs(1,0);
		ans = dp[1][crum];
	}
	printf("%lld\n",ans );
}

Compilation message

chase.cpp: In function 'void dfs(int, int)':
chase.cpp:12:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   12 |  for(int i = 0; i < grafo[x].size(); i++){
      |                 ~~^~~~~~~~~~~~~~~~~
chase.cpp: In function 'int main()':
chase.cpp:25:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   25 |  scanf("%d %d", &n, &crum);
      |  ~~~~~^~~~~~~~~~~~~~~~~~~~
chase.cpp:30:35: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   30 |  for(int i = 1; i <= n; i++) scanf("%lld", &a[i]);
      |                              ~~~~~^~~~~~~~~~~~~~~
chase.cpp:33:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   33 |   scanf("%d %d", &u, &v);
      |   ~~~~~^~~~~~~~~~~~~~~~~

Subtask #1
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 2688 KB Output is correct
2 Correct 2 ms 2688 KB Output is correct
3 Correct 2 ms 2688 KB Output is correct
4 Correct 2 ms 2688 KB Output is correct
5 Correct 2 ms 2688 KB Output is correct
6 Correct 2 ms 2688 KB Output is correct

Subtask #2
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 2688 KB Output is correct
2 Correct 2 ms 2688 KB Output is correct
3 Correct 2 ms 2688 KB Output is correct
4 Correct 2 ms 2688 KB Output is correct
5 Correct 2 ms 2688 KB Output is correct
6 Correct 2 ms 2688 KB Output is correct
7 Correct 295 ms 3584 KB Output is correct
8 Correct 38 ms 3584 KB Output is correct
9 Correct 25 ms 3584 KB Output is correct
10 Correct 315 ms 3584 KB Output is correct
11 Correct 130 ms 3584 KB Output is correct
12 Correct 74 ms 3584 KB Output is correct

Subtask #3
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 182 ms 99544 KB Output is correct
2 Correct 176 ms 99448 KB Output is correct
3 Correct 122 ms 95984 KB Output is correct
4 Correct 139 ms 95608 KB Output is correct
5 Correct 191 ms 95680 KB Output is correct
6 Correct 190 ms 95736 KB Output is correct
7 Correct 190 ms 95608 KB Output is correct

Subtask #4
0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 2688 KB Output is correct
2 Correct 2 ms 2688 KB Output is correct
3 Correct 2 ms 2688 KB Output is correct
4 Correct 2 ms 2688 KB Output is correct
5 Correct 2 ms 2688 KB Output is correct
6 Correct 2 ms 2688 KB Output is correct
7 Correct 295 ms 3584 KB Output is correct
8 Correct 38 ms 3584 KB Output is correct
9 Correct 25 ms 3584 KB Output is correct
10 Correct 315 ms 3584 KB Output is correct
11 Correct 130 ms 3584 KB Output is correct
12 Correct 74 ms 3584 KB Output is correct
13 Correct 182 ms 99544 KB Output is correct
14 Correct 176 ms 99448 KB Output is correct
15 Correct 122 ms 95984 KB Output is correct
16 Correct 139 ms 95608 KB Output is correct
17 Correct 191 ms 95680 KB Output is correct
18 Correct 190 ms 95736 KB Output is correct
19 Correct 190 ms 95608 KB Output is correct
20 Incorrect 238 ms 95736 KB Output isn't correct
21 Halted 0 ms 0 KB -