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Submission #31928

# Submission time Handle Problem Language Result Execution time Memory
31928 2017-09-16T08:42:40 Z kazel Biochips (IZhO12_biochips) C++14
100 / 100
 259 ms 400728 KB 
#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

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
100.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 399672 KB Output is correct
2 Correct 0 ms 399672 KB Output is correct
3 Correct 3 ms 399672 KB Output is correct
4 Correct 9 ms 399804 KB Output is correct
5 Correct 13 ms 399804 KB Output is correct
6 Correct 6 ms 399804 KB Output is correct
7 Correct 163 ms 400728 KB Output is correct
8 Correct 156 ms 400728 KB Output is correct
9 Correct 159 ms 400728 KB Output is correct
10 Correct 259 ms 400728 KB Output is correct