Submission #13346

#	Time	Username	Problem	Language	Result	Execution time	Memory
13346		woqja125	Three Friends (BOI14_friends)	C++98	100 / 100	26 ms	3036 KiB

friends

#include<stdio.h>
char s[2000010];
int main()
{
    int n, n2, cnt = 0, i;
    scanf("%d%s", &n, s);
    if(n%2 == 0)
    {
        printf("NOT POSSIBLE\n");
        return 0;
    }
    n2 = n/2;
    int ch = 0;
    for(i=n2+1; i<n; i++)
    {
        if(ch == 0 && s[i-n2-1] == s[i]) continue;
        else if(ch == 0 && s[i-n2] == s[i]) ch++;
        else if (ch == 0) break;
        else if (ch == 1 && s[i-n2] != s[i]) break;
    }
    if(i==n) cnt++;
    ch = 0;
    for(i=0; i<n2; i++)
    {
        if(ch == 0 && s[i+n2] == s[i]) continue;
        else if(ch == 0 && s[i+n2+1] == s[i]) ch++;
        else if(ch == 0) break;
        else if(ch == 1 && s[i+n2+1] != s[i]) break;
    }
    if(i==n2)
    {
        if(cnt == 0)
        {
            for(i=0; i<n2; i++) printf("%c", s[i]);
        }
        else
        {
            for(i=0; i<n2; i++) if(s[i] != s[i+n2+1]) break;
            if(i==n2) for(i=0; i<n2; i++) printf("%c", s[i]);
            else printf("NOT UNIQUE\n");
        }
    }
    else if(cnt == 1)
    {
        for(i=n2+1; i<n; i++)printf("%c", s[i]);
    }
    else printf("NOT POSSIBLE\n");
 
    return 0;
}

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