Submission #14813

#	Time	Username	Problem	Language	Result	Execution time	Memory
14813		eaststar	Three Friends (BOI14_friends)	C++98	100 / 100	25 ms	3036 KiB

friends

#include <stdio.h>
#include <string.h>
char a[2000010];
int f(int s1,int e1,int s2,int e2){
    int cnt=0;
    while(s1<=e1){
        if(a[s1]==a[s2])++s1,++s2;
        else{
            if(cnt)return 0;
            ++s2,++cnt;
        }
    }
    return 1;
}
int main()
{
    int i,n,flag=0;
    scanf("%d",&n);
    if(n%2==0){
        puts("NOT POSSIBLE");
        return 0;
    }
    scanf("%s",a+1);
    if(!strncmp(a+n/2+2,a+1,n/2)){
        for(i=1;i<=n/2;++i)printf("%c",a[i]);
        return 0;
    }
    if(f(1,n/2,n/2+1,n))flag=1;
    if(f(n/2+2,n,1,n/2+1)){
        if(flag){
            puts("NOT UNIQUE");
            return 0;
        }
        flag=2;
    }
    if(!flag)puts("NOT POSSIBLE");
    if(flag==1)for(i=1;i<=n/2;++i)printf("%c",a[i]);
    if(flag==2)for(i=n/2+2;i<=n;++i)printf("%c",a[i]);
    return 0;
}

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