#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
const int mx = 200005;
int dt[mx], ft[mx], clk;
int ord[mx], num;
int n, m;
int mem[mx];
int dp[mx][505];
vector<int> Child[mx];
void dfs(int x){
dt[x] = ++clk;
for(int &u : Child[x]){
dfs(u);
}
ft[x] = ++clk;
ord[num++] = x;
}
int main(){
ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0);
cin >> n >> m;
int rt;
for(int i=1,p;i<=n;i++){
cin >> p >> mem[i];
if(p) Child[p].push_back(i);
else rt = i;
}
dfs(rt);
for(int i=0;i<n;i++){
int u = ord[i];
int l = dt[u], r = ft[u];
for(int j = 1; j <= m; j++) dp[r][j] = max( dp[r-1][j], dp[r][j] );
for(int j = 1; j <= m && j <= l; j++) dp[r][j] = max( dp[l-1][j-1] + mem[u], dp[r][j]);
}
int ans = 0;
for(int i=1;i<=clk;i++) ans = max(dp[i][m], ans);
cout << ans << endl;
/*
for(int i=1;i<=clk;i++){
printf("Clock = %d : ",i);
for(int j=0;j<=m;j++){
printf("%d ",dp[i][j]);
}
puts("");
}
*/
}
Compilation message
biochips.cpp: In function 'int main()':
biochips.cpp:36:12: warning: 'rt' may be used uninitialized in this function [-Wmaybe-uninitialized]
dfs(rt);
^
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
0 ms |
404532 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
