Submission #711342

#	Time	Username	Problem	Language	Result	Execution time	Memory
711342		PoonYaPat	Three Friends (BOI14_friends)	C++14	0 / 100	29 ms	5432 KiB

friends

#include <bits/stdc++.h>
using namespace std;

string s;
int cnt,skip,st,ed;

int main() {
    ios_base::sync_with_stdio(0); cin.tie(0);
    int n; cin>>n;
    cin>>s;

    if (s.size()%2==0) {
        cout<<"NOT POSSIBLE";
        return 0;
    }

    //consider insert letter in the middle
    bool ok=true;
    for (int i=0; i<s.size()/2; ++i) {
        if (s[i]!=s[i+s.size()/2+1]) ok=false;
    }
    if (ok) ++cnt, skip=s.size()/2;

    //consider insert letter on the left string
    for (int i=0; i<=s.size()/2; ++i) {
        if (s[i]!=s[i+s.size()/2+1] || i==s.size()/2) {
            ed=i;
            break;
        }
    }
    for (int i=s.size()/2; i>=0; --i) {
        if (s[i]!=s[i+s.size()/2] || i==0) {
            st=i;
            break;
        }
    }
    if (st<ed) {
        cout<<"NOT UNIQUE";
        return 0;
    } else if (st==ed) {
        ++cnt;
        skip=st;
    }

    //consider insert letter on the right string
    for (int i=s.size()/2; i<s.size(); ++i) {
        if (s[i]!=s[i-s.size()/2] || i==s.size()-1) {
            ed=i;
            break;
        }
    }
    for (int i=s.size()-1; i>=s.size()/2; --i) {
        if (s[i]!=s[i-s.size()/2-1] || i==s.size()/2) {
            st=i;
            break;
        }
    }
    if (st<ed) {
        cout<<"NOT UNIQUE";
        return 0;
    } else if (st==ed) {
        ++cnt;
        skip=st;
    }

    if (cnt==0) cout<<"NOT POSSIBLE";
    else if (cnt>1) cout<<"NOT UNIQUE";
    else {
        int k=0,idx=0;
        while (k<s.size()/2) {
            if (skip!=idx) cout<<s[idx], ++k;
            ++idx;
        }
    }
}

Compilation message (stderr)

friends.cpp: In function 'int main()':
friends.cpp:19:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   19 |     for (int i=0; i<s.size()/2; ++i) {
      |                   ~^~~~~~~~~~~
friends.cpp:25:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   25 |     for (int i=0; i<=s.size()/2; ++i) {
      |                   ~^~~~~~~~~~~~
friends.cpp:26:41: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   26 |         if (s[i]!=s[i+s.size()/2+1] || i==s.size()/2) {
      |                                        ~^~~~~~~~~~~~
friends.cpp:46:29: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   46 |     for (int i=s.size()/2; i<s.size(); ++i) {
      |                            ~^~~~~~~~~
friends.cpp:47:39: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   47 |         if (s[i]!=s[i-s.size()/2] || i==s.size()-1) {
      |                                      ~^~~~~~~~~~~~
friends.cpp:52:29: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   52 |     for (int i=s.size()-1; i>=s.size()/2; --i) {
      |                            ~^~~~~~~~~~~~
friends.cpp:53:41: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   53 |         if (s[i]!=s[i-s.size()/2-1] || i==s.size()/2) {
      |                                        ~^~~~~~~~~~~~
friends.cpp:70:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   70 |         while (k<s.size()/2) {
      |                ~^~~~~~~~~~~

• Subtask 1: 0 / 35
• Subtask 2: 0 / 65