Submission #337669

#	Time	Username	Problem	Language	Result	Execution time	Memory
337669		Sho10	Three Friends (BOI14_friends)	C++14	100 / 100	13 ms	8208 KiB

friends

#include <bits/stdc++.h> //Andrei Alexandru a.k.a Sho10
#define ll long long
#define double long double
#pragma GCC optimize("O3")
#pragma GCC optimize("Ofast")
#define all(a) (a).begin(), (a).end()
#define f first
#define s second
#define pb push_back
#define mp make_pair
#define pi pair
#define rc(s) return cout<<s,0
#define endl '\n'
#define mod 1000000007
#define PI 3.14159265359
#define MAXN 100005
#define INF 1000000005
#define LINF 1000000000000000005ll
#define CODE_START  ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0);
using namespace std;
ll n;
string s;
vector<string>ans;
void calc(string a,string b){
ll cnt[3];
cnt[0]=cnt[1]=cnt[2]=0;
while(cnt[0]<a.size()&&cnt[1]<b.size()){
    if(a[cnt[0]]==b[cnt[1]]){
        cnt[0]++;
        cnt[1]++;
    }else {
    cnt[2]++;
    cnt[1]++;
    }
}
if(cnt[2]>1){
    return;
}
if(ans.empty()){
    ans.pb(a);
    return;
}
if(ans[0]!=a){
    ans.pb(a);
    return;
}
}
int32_t main(){
CODE_START;
cin>>n;
cin>>s;
if(n%2==0){
    cout<<"NOT POSSIBLE"<<endl;
    return 0;
}
n/=2;
calc(s.substr(0,n),s.substr(n,n+1));
calc(s.substr(n+1,n),s.substr(0,n+1));
if(ans.empty()){
    cout<<"NOT POSSIBLE"<<endl;
}else if(ans.size()==1){
cout<<ans[0]<<endl;
}else {
cout<<"NOT UNIQUE"<<endl;
}
}

Compilation message (stderr)

friends.cpp: In function 'void calc(std::string, std::string)':
friends.cpp:27:13: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   27 | while(cnt[0]<a.size()&&cnt[1]<b.size()){
      |       ~~~~~~^~~~~~~~~
friends.cpp:27:30: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   27 | while(cnt[0]<a.size()&&cnt[1]<b.size()){
      |                        ~~~~~~^~~~~~~~~

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