Cod

#include <fstream>
#include <vector>

using namespace std;
ifstream in("3cifre.in");
ofstream out("3cifre.out");
int n,cerinta,maxim=0,minim=1001,maxAp;
long long temp;
vector<int> frecv(1001);
vector<long long> start(1001);
vector<long long> sfarsit(1001);

void rezolva(long long val){
    int numar,cif;
    while(val!=0){
        numar = val%1000;
        if(numar>99){
            ++frecv[numar];
            if(start[numar]==0){start[numar] = temp;}
            sfarsit[numar] = temp;
            if(maxim<numar){maxim = numar;}
            if(minim>numar){minim = numar;}
            if(frecv[numar]>maxAp){maxAp = frecv[numar];}
        }
        val/=10;
    }
}
void citire(){
    in>>n>>cerinta;
    for(int i=0;i<n;++i){
        in>>temp;
        rezolva(temp);
    }
}
int main()
{
    citire();
    if(cerinta==1){
        out<<minim<<" "<<frecv[minim]<<" "<<start[minim]<<" "<<sfarsit[minim]<<'\n';
        out<<maxim<<" "<<frecv[maxim]<<" "<<start[maxim]<<" "<<sfarsit[maxim];
    }
    else{
        out<<maxAp<<'\n';
        for(int i=100;i<1000;++i){
            if(frecv[i]==maxAp){
                out<<i<<" ";
            }
        }
    }
    return 0;
}