Submission #161397

#	Time	Username	Problem	Language	Result	Execution time	Memory
161397		georgerapeanu	Untitled (POI11_imp)	C++11	0 / 100	1092 ms	42616 KiB

Main

#include <cstdio>
#include <vector>
#include <algorithm>
#include <ctime>
#include <cstdlib>

using namespace std;

const int NMAX = 3000;

int n,m;
vector<int> graph[NMAX + 5];
int gr[NMAX + 5];
bool del[NMAX + 5];

int main(){

    scanf("%d %d",&n,&m);

    for(int i = 1;i <= m;i++){
        int x,y;
        scanf("%d %d",&x,&y);
        gr[x]++;
        gr[y]++;
        graph[x].push_back(y);
        graph[y].push_back(x);
    }

    vector<int> elim;

    for(int i = 1;i <= n;i++){
        if(gr[i] < 2 * n / 3 - 1){
            elim.push_back(i);
            del[i] = true;
        }
    }

    for(int i = 0;i < (int)elim.size();i++){
        for(auto it:graph[elim[i]]){
            gr[it]--;
            if(del[it] == false && gr[it] < 2 * n / 3 - 1){
                del[it] = true;
                elim.push_back(it);
            }
        }
    }

    vector<pair<int,int> > nodes;

    for(int i = 1;i <= n;i++){
        if(del[i] == false){
            nodes.push_back({gr[i],i});
        }
    }
    srand(time(NULL));

    random_shuffle(nodes.begin(),nodes.end());

    elim.clear();

    for(int i = 0;i < n / 3;i++){
        elim.push_back(nodes[i].second);
        del[nodes[i].second] = true;
    }

    for(int i = 0;i < (int)elim.size();i++){
        for(auto it:graph[elim[i]]){
            gr[it]--;
            if(del[it] == false && gr[it] < n / 3 - 1){
                del[it] = true;
                elim.push_back(it);
            }
        }
    }

    vector<int> ans;

    for(int i = 1;i <= n;i++){
        if(del[i] == false){
            ans.push_back(i);
        }
    }

    random_shuffle(ans.begin(),ans.end());

    ans.resize(n / 3);

    for(auto it:ans){
        printf("%d ",it);
    }
    
    return 0;
}

Compilation message (stderr)

imp.cpp: In function 'int main()':
imp.cpp:18:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d %d",&n,&m);
     ~~~~~^~~~~~~~~~~~~~~
imp.cpp:22:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d %d",&x,&y);
         ~~~~~^~~~~~~~~~~~~~~

• Subtask 1: 0 / 9
• Subtask 2: 0 / 9
• Subtask 3: 0 / 9
• Subtask 4: 0 / 9
• Subtask 5: 0 / 9
• Subtask 6: 0 / 9
• Subtask 7: 0 / 9
• Subtask 8: 0 / 9
• Subtask 9: 0 / 9
• Subtask 10: 0 / 9
• Subtask 11: 0 / 10