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Submission #309856

# Submission time Handle Problem Language Result Execution time Memory
309856 2020-10-04T17:44:14 Z peuch Chase (CEOI17_chase) C++17
0 / 100
 4000 ms 53968 KB 
#include<bits/stdc++.h>
using namespace std;

const int MAXN = 1e5 + 10;
const int MAXB = 110;

int n, b;
int val[MAXN], sum[MAXN], pai[MAXN];
int dp[MAXN][MAXB];

vector<int> ar[MAXN];

void calcDP(int cur);

int main(){
	scanf("%d %d", &n, &b);
	for(int i = 1; i <= n; i++)
		scanf("%d", &val[i]);
	
	for(int i = 1; i < n; i++){
		int a, b;
		scanf("%d %d", &a, &b);
		ar[a].push_back(b);
		ar[b].push_back(a);
		sum[a] += val[b];
		sum[b] += val[a];
	}
	int ans = 0;
	for(int i = 1; i <= n; i++){
		pai[i] = 0;
		calcDP(i);
		ans = max(ans, dp[i][b]);
	}
	printf("%d\n", ans);
}

void calcDP(int cur){
	for(int j = 0; j <= b; j++)
		dp[cur][j] = 0;
	for(int i = 0; i < ar[cur].size(); i++){
		int viz = ar[cur][i];
		if(viz == pai[cur]) continue;
		pai[viz] = cur;
		calcDP(viz);
	}
	for(int i = 0; i < ar[cur].size(); i++){
		int viz = ar[cur][i];
		if(viz == pai[cur]) continue;
		dp[cur][0] = max(dp[cur][0], dp[viz][0]);
		for(int j = 1; j <= b; j++){
			dp[cur][j] = max(dp[cur][j], dp[viz][j - 1] + sum[cur] - val[pai[cur]]);
			dp[cur][j] = max(dp[cur][j], dp[viz][j]);
		}
	}
}

/*
12 2
2 3 3 8 1 5 6 7 8 3 5 4
2 1
2 7
3 4
4 7
7 6
5 6
6 8
6 9
7 10
10 11
10 12

10 1
1 2 3 4 5 6 7 8 9 9
1 2
2 3
3 4
4 5
5 6
6 7
7 8
8 9
8 10
*/

Compilation message

chase.cpp: In function 'void calcDP(int)':
chase.cpp:40:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   40 |  for(int i = 0; i < ar[cur].size(); i++){
      |                 ~~^~~~~~~~~~~~~~~~
chase.cpp:46:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   46 |  for(int i = 0; i < ar[cur].size(); i++){
      |                 ~~^~~~~~~~~~~~~~~~
chase.cpp: In function 'int main()':
chase.cpp:16:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   16 |  scanf("%d %d", &n, &b);
      |  ~~~~~^~~~~~~~~~~~~~~~~
chase.cpp:18:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   18 |   scanf("%d", &val[i]);
      |   ~~~~~^~~~~~~~~~~~~~~
chase.cpp:22:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   22 |   scanf("%d %d", &a, &b);
      |   ~~~~~^~~~~~~~~~~~~~~~~

Subtask #1
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 Incorrect 2 ms 2688 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #2
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 Incorrect 2 ms 2688 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #3
0 / 30.0

# Verdict Execution time Memory Grader output
1 Execution timed out 4081 ms 53968 KB Time limit exceeded
2 Halted 0 ms 0 KB -

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 Incorrect 2 ms 2688 KB Output isn't correct
4 Halted 0 ms 0 KB -