Submission #85248

#	Time	Username	Problem	Language	Result	Execution time	Memory
85248		zoooma13	Biochips (IZhO12_biochips)	C++14	0 / 100	2094 ms	183576 KiB

biochips

#include <bits/stdc++.h>
using namespace std;

#define MAX_N 200005
#define MAX_M 502
#define INF 0x3f3f3f3f

int N ,M;
int A ,B;
int Mem[MAX_N];
vector <int> Adj[MAX_N];

int dp[MAX_M][MAX_N];
void Solve(int v)
{
    int dp_new[M+1] ,dp_all[M+1] = {0};
    for(int i : Adj[v])
    {
        Solve(i);

        memset(dp_new ,-INF ,sizeof dp_new);
        for(int j=1; j<=M; j++)
        for(int k=0; k<=M-j; k++)
            dp_new[j+k] = max(dp_new[j+k] ,dp_all[k] + dp[j][i]);

        for(int k=0; k<=M; k++)
            dp_all[k] = max(dp_all[k] ,dp_new[k]);
    }

    for(int l=0; l<=M; l++)
        dp[l][v] = dp_all[l];
    dp[1][v] = max(dp[1][v] ,Mem[v]);
}

int main()
{
    scanf("%d%d",&N,&M); assert(N < MAX_N && M < MAX_M);

    int root;
    for(int i=1; i<=N; i++)
    {
        scanf("%d%d",&A,&B);

        Mem[i] = B;
        if(A == 0)
            root = i;
        else
            Adj[A].push_back(i);
    }

    Solve(root);
    printf("%d\n",dp[M][root]);
}

Compilation message (stderr)

biochips.cpp: In function 'int main()':
biochips.cpp:37:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d%d",&N,&M); assert(N < MAX_N && M < MAX_M);
     ~~~~~^~~~~~~~~~~~~~
biochips.cpp:42:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d%d",&A,&B);
         ~~~~~^~~~~~~~~~~~~~
biochips.cpp:52:11: warning: 'root' may be used uninitialized in this function [-Wmaybe-uninitialized]
     printf("%d\n",dp[M][root]);
     ~~~~~~^~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 100