Submission #89839

#	Time	Username	Problem	Language	Result	Execution time	Memory
89839		Vardanyan	Biochips (IZhO12_biochips)	C++17	0 / 100	2057 ms	404216 KiB

biochips

#pragma GCC optimize "-O3"
#include<bits/stdc++.h>
using namespace std;
const int N = 200*1000+5;
const int M = 505;
int dp[N][M];
int tin[N];
int tout[N];
int a[N];
int d[N];
vector<int> g[N];
int timer = 0;
void dfs(int v){
    tin[v] = ++timer;
    d[timer] = a[v];
    dp[timer][1] = a[v];
    for(int i = 0;i<g[v].size();i++){
        int to = g[v][i];
        dfs(to);
    }
    tout[tin[v]] = timer;
}
int main()
{
    int n,m;
    scanf("%d%d",&n,&m);
    int root;
    for(int i = 1;i<=n;i++){
        int x,y;
        scanf("%d%d",&x,&y);
        if(x == 0) root = i;
          if(x){
            g[x].push_back(i);
          }
        a[i] = y;
    }
    dfs(root);
    for(int j = 1;j<=m;j++){
        for(int i = timer;i>=1;i--){
            //cout<<d[i]<<endl;
         dp[i][j] = max(dp[i][j],dp[i+1][j]);
         if(tout[i]+1<=timer)   dp[i][j] = max(dp[i][j],dp[tout[i]+1][j-1]+d[i]);
        }
    }
    cout<<dp[1][m]<<endl;
    return 0;
}

Compilation message (stderr)

biochips.cpp: In function 'void dfs(int)':
biochips.cpp:17:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i = 0;i<g[v].size();i++){
                   ~^~~~~~~~~~~~
biochips.cpp: In function 'int main()':
biochips.cpp:26:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d%d",&n,&m);
     ~~~~~^~~~~~~~~~~~~~
biochips.cpp:30:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d%d",&x,&y);
         ~~~~~^~~~~~~~~~~~~~
biochips.cpp:37:8: warning: 'root' may be used uninitialized in this function [-Wmaybe-uninitialized]
     dfs(root);
     ~~~^~~~~~

• Subtask 1: 0 / 100