51Nod 1347 旋转字符串
2017-11-28 21:31
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#include<iostream>
#include<queue>
#include<vector>
#include<stack>
#include<algorithm>
#include<cmath>
#include<set>
using namespace std;
const long long INF=1e18;
int main(){
string str;
while(cin>>str){
if(str.size()%2==1){
printf("NO\n");
continue;
}
int mid=str.size()/2;
int flag=0;
for(int i=0;i<mid;i++){
if(str[i]!=str[mid+i]) flag=1;
}
if(flag) printf("NO\n");
else printf("YES\n");
}
return 0;
}
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