Submission #31928

#	Time	Username	Problem	Language	Result	Execution time	Memory
31928		kazel	Biochips (IZhO12_biochips)	C++14	100 / 100	259 ms	400728 KiB

biochips

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

int val[200001], m, t;
vector<int> g[200001];
int dp[200001][501], par[200001];

void dfs(int c)
{
    par[c] = t;
    for(int e : g[c]) dfs(e);
    for(int i=1;i<=m;i++)
        dp[t+1][i] = max(dp[t][i],dp[par[c]][i-1]+val[c]);
    t++;
}

int main()
{
    int n, r;
    scanf("%d%d",&n,&m);
    for(int i=1;i<=n;i++)
    {
        int p;
        scanf("%d%d",&p,val+i);
        if(!p) r = i;
        else g[p].push_back(i);
    }
    for(int i=1;i<=m;i++) dp[0][i] = -1e9;
    dfs(r);
    printf("%d\n",dp[n][m]);
}

Compilation message (stderr)

biochips.cpp: In function 'int main()':
biochips.cpp:20:24: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d%d",&n,&m);
                        ^
biochips.cpp:24:31: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d%d",&p,val+i);
                               ^
biochips.cpp:29:11: warning: 'r' may be used uninitialized in this function [-Wmaybe-uninitialized]
     dfs(r);
           ^

• Subtask 1: 100 / 100