#include <bits/stdc++.h>
#define z exit(0)
using namespace std;
const int N = 2e5 + 5, inf = 2e8;
vector<int> g[N];
int x[N], tin[N], tout[N], timer = 1, V[N], dp[N][501], mx[501][N];
void dfs(int u){
tin[u] = timer++;
for(int v: g[u]) dfs(v);
tout[u] = timer++;
}
bool cmp(int i, int j){ return tout[i] < tout[j]; }
signed main(){
int n, m, r = 0; scanf("%d %d", &n, &m);
for(int v = 0, u; v<n; ++v){
scanf("%d %d", &u, x+v); --u;
if(u != -1) g[u].push_back(v);
else r = v;
V[v] = v;
fill(dp[v], dp[v]+m+1, -inf);
}
dfs(r);
sort(V, V+n, cmp);
mx[0][0] = dp[0][0] = 0;
mx[1][0] = dp[0][1] = x[V[0]];
int ans = dp[0][m];
for(int i = 1; i<n; ++i){
int low = 0, high = i-1, idx = -1;
while(low <= high){
int mid = low + ((high-low)>>1);
if(tout[V[mid]] < tin[V[i]]) low = mid+1, idx = mid;
else high = mid-1;
}
for(int k = 0; k<=m; ++k){
dp[i][k] = max(dp[i][k], dp[i-1][k]);
if(idx != -1) dp[i][k] = max(dp[i][k], mx[k-1][idx] + x[V[i]]);
mx[k][i] = dp[i][k];
}
ans = max(ans, dp[i][m]);
for(int k = 0; k<=m; ++k) mx[k][i] = max(mx[k][i], mx[k][i-1]);
}
assert(ans == mx[m][n-1]);
printf("%d", mx[m][n-1]);
}
Compilation message
biochips.cpp: In function 'int main()':
biochips.cpp:14:24: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
14 | int n, m, r = 0; scanf("%d %d", &n, &m);
| ~~~~~^~~~~~~~~~~~~~~~~
biochips.cpp:16:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
16 | scanf("%d %d", &u, x+v); --u;
| ~~~~~^~~~~~~~~~~~~~~~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
2 ms |
5212 KB |
Output is correct |
| 2 |
Incorrect |
2 ms |
4956 KB |
Output isn't correct |
| 3 |
Incorrect |
2 ms |
5468 KB |
Output isn't correct |
| 4 |
Incorrect |
14 ms |
25176 KB |
Output isn't correct |
| 5 |
Incorrect |
18 ms |
28448 KB |
Output isn't correct |
| 6 |
Incorrect |
20 ms |
29528 KB |
Output isn't correct |
| 7 |
Incorrect |
348 ms |
474140 KB |
Output isn't correct |
| 8 |
Incorrect |
362 ms |
474140 KB |
Output isn't correct |
| 9 |
Runtime error |
365 ms |
524288 KB |
Execution killed with signal 9 |
| 10 |
Runtime error |
364 ms |
524288 KB |
Execution killed with signal 9 |
