Submission #154440

#	Time	Username	Problem	Language	Result	Execution time	Memory
154440		brcode	Three Friends (BOI14_friends)	C++14	100 / 100	142 ms	9164 KiB

friends

#include <iostream>

using namespace std;
string res;
string res2;
bool ans1 = true;
bool ans2 = true;
int main(){
    int n;
    cin>>n;
    string s;
    cin>>s;

    int mid = (s.length()+1)/2;
    int sz = (s.length()-1)/2;
    s='#'+s;
    int temp = mid+1;
    bool ok = false;
    int j = 1;
    int cnt = 1;
    while(cnt<=sz){

        if(s[j]!=s[temp]){
            if(ok){
                ans1= false;
                break;
            }else{
                ok = true;
                j++;
            }
        }else{
            temp++;
            j++;
            cnt++;
        }

    }
    ok = false;
    temp= mid;
    j=1;
    cnt = 1;
    while(cnt<=sz){
      //      cout<<s[j]<<" "<<s[temp]<<endl;
        if(s[j]!=s[temp]){
            if(ok){
                ans2 = false;
                break;
            }else{
                ok = true;
                temp++;
            }
        }else{
            temp++;
            j++;
            cnt++;
        }

    }

 //   cout<<ans1<<" "<<ans2<<endl;
    if((!ans1 && !ans2)||s.length()%2 == 1){
        cout<<"NOT POSSIBLE"<<endl;
    }else if(!ans2){

        for(int i=mid+1;i<s.length();i++){
            res+=s[i];
        }
        cout<<res<<endl;
    }else if(!ans1){
        for(int i=1;i<=sz;i++){
            res+=s[i];
        }
        cout<<res<<endl;
    }else{
            // cout<<res<<" "<<res2<<endl;
            res="";
            res2="";
         for(int i=mid+1;i<s.length();i++){
              //  cout<<s[i]<<endl;
            res+=s[i];
        }
         for(int i=1;i<=sz;i++){

            res2+=s[i];

        }

        if(res == res2){
            cout<<res<<endl;
        }else{

            cout<<"NOT UNIQUE"<<endl;
        }
    }
}

Compilation message (stderr)

friends.cpp: In function 'int main()':
friends.cpp:65:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for(int i=mid+1;i<s.length();i++){
                         ~^~~~~~~~~~~
friends.cpp:78:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
          for(int i=mid+1;i<s.length();i++){
                          ~^~~~~~~~~~~

• Subtask 1: 35 / 35
• Subtask 2: 65 / 65