Submission #85202

#	Time	Username	Problem	Language	Result	Execution time	Memory
85202		zoooma13	Biochips (IZhO12_biochips)	C++14	0 / 100	2060 ms	4892 KiB

biochips

#pragma GCC optimize("Ofast")

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

#define MAX_N 10004
#define MAX_M 102
#define INF 0x3f3f3f3f

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

int dp[MAX_M][MAX_N];
int Solve(int v ,int m)
{
    if(Adj[v].empty())
        return (m == 1 ? Mem[v] : -INF);
    if(~dp[m][v])
        return dp[m][v];

    int dp_new[m+1] ,dp_all[m+1] = {0};
    for(int i : Adj[v])
    {
        memset(dp_new ,-INF ,sizeof dp_new);

        for(int j=1; j<=m; j++)
        for(int h=0; h<=m-j; h++)
            dp_new[j+h] = max(dp_new[j+h] ,dp_all[h] + Solve(i ,j));

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

    return dp[m][v] = (m == 1 ? max(dp_all[m] ,Mem[v]) : dp_all[m]);
}

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

    int root;
    for(int i=0; i<N; i++)
    {
        scanf("%d%d",&A,&B);

        Mem[i+1] = B;
        if(A == 0)
            root = i+1;
        else
            Adj[A].push_back(i+1);
    }

    memset(dp ,-1 ,sizeof dp);
    printf("%d\n",Solve(root ,M));
}

Compilation message (stderr)

biochips.cpp: In function 'int main()':
biochips.cpp:41:10: 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:46:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d%d",&A,&B);
         ~~~~~^~~~~~~~~~~~~~
biochips.cpp:56:11: warning: 'root' may be used uninitialized in this function [-Wmaybe-uninitialized]
     printf("%d\n",Solve(root ,M));
     ~~~~~~^~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 100