Submission #874095

#	Time	Username	Problem	Language	Result	Execution time	Memory
874095		YongXin	Friend (IOI14_friend)	C++14	11 / 100	1098 ms	29116 KiB

friend

#include <bits/stdc++.h>
using namespace std;
int N,Confidence[100000];
vector<int>adj[100000];
int dp(bool cant[],int i){
    if(i==N)return 0;
    if(cant[i])return dp(cant,i+1);
    bool choose[N];
    for(int j=0;j<N;++j)choose[j]=cant[j];
    for(int j=0;j<adj[i].size();++j)choose[adj[i][j]]=true;
    return max(dp(choose,i+1)+Confidence[i],dp(cant,i+1));
}
int findSample(int n,int confidence[],int host[],int protocol[]){
    ios_base::sync_with_stdio(false);cin.tie(NULL);
    N=n+1;
    for(int i=0;i<N;++i)Confidence[i]=confidence[i];
    for(int i=1;i<N;++i){
        if(protocol[i]!=1){
            adj[i].push_back(host[i]);
            adj[host[i]].push_back(i);
        }
        if(protocol[i]!=0)for(int j=0;j<adj[host[i]].size();++j){
            adj[i].push_back(adj[host[i]][j]);
            adj[adj[host[i]][j]].push_back(i);
        }
    }
    bool cant[N];
    memset(cant,0,N);
    return dp(cant,0);
}

Compilation message (stderr)

friend.cpp: In function 'int dp(bool*, int)':
friend.cpp:10:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   10 |     for(int j=0;j<adj[i].size();++j)choose[adj[i][j]]=true;
      |                 ~^~~~~~~~~~~~~~
friend.cpp: In function 'int findSample(int, int*, int*, int*)':
friend.cpp:22:40: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   22 |         if(protocol[i]!=0)for(int j=0;j<adj[host[i]].size();++j){
      |                                       ~^~~~~~~~~~~~~~~~~~~~

• Subtask 1: 11 / 11
• Subtask 2: 0 / 8
• Subtask 3: 0 / 8
• Subtask 4: 0 / 19
• Subtask 5: 0 / 23
• Subtask 6: 0 / 31