Submission #1703109


Source Code Expand

#include <bits/stdc++.h>
#define REP(i,a,b) for(int i=(a);i<(b);i++)
#define RREP(i,a,b) for(int i=(a);i>=(b);i--)
typedef long long ll; typedef long double ld;
using namespace std;
const int INF=1e9, MOD=1e9+7, around[]={0,1,1,-1,0,-1,1,0,0};
const ld PI=abs(acos(-1));
int c=0;
string s;
	
int main(){
	cin >> s;
	int r=s.size()-1, l=0;
	while(1){
		if(s[l]!=s[r]){
			if(s[l]=='x') l++;
			else if(s[r]=='x') r--;
			else{
				cout << -1 << endl;
				return 0;
			}
		}else{
			l++;
			r--;
		}
		
		if(r<=l) break;
	}

	r=s.size()-1, l=0;
	while(1){
		if(s[l]!=s[r]){
			if(s[l]=='x') c++,l++;
			else if(s[r]=='x') c++,r--;
		}else{
			l++;
			r--;
		}
		
		if(r<=l) break;
	}
	
	cout << c << endl;
	return 0;
}

Submission Info

Submission Time
Task C - Inserting 'x'
User ecasdqina
Language C++14 (GCC 5.4.1)
Score 400
Code Size 762 Byte
Status AC
Exec Time 5 ms
Memory 512 KB

Judge Result

Set Name Sample All
Score / Max Score 0 / 0 400 / 400
Status
AC × 4
AC × 33
Set Name Test Cases
Sample 0_00.txt, 0_01.txt, 0_02.txt, 0_03.txt
All 0_00.txt, 0_01.txt, 0_02.txt, 0_03.txt, 1_00.txt, 1_01.txt, 1_02.txt, 1_03.txt, 1_04.txt, 1_05.txt, 1_06.txt, 1_07.txt, 1_08.txt, 1_09.txt, 1_10.txt, 1_11.txt, 1_12.txt, 1_13.txt, 1_14.txt, 1_15.txt, 1_16.txt, 1_17.txt, 1_18.txt, 1_19.txt, 1_20.txt, 1_21.txt, 1_22.txt, 1_23.txt, 1_24.txt, 1_25.txt, 1_26.txt, 1_27.txt, 1_28.txt
Case Name Status Exec Time Memory
0_00.txt AC 1 ms 256 KB
0_01.txt AC 1 ms 256 KB
0_02.txt AC 1 ms 256 KB
0_03.txt AC 1 ms 256 KB
1_00.txt AC 1 ms 256 KB
1_01.txt AC 1 ms 256 KB
1_02.txt AC 1 ms 256 KB
1_03.txt AC 1 ms 256 KB
1_04.txt AC 1 ms 256 KB
1_05.txt AC 1 ms 256 KB
1_06.txt AC 4 ms 512 KB
1_07.txt AC 4 ms 512 KB
1_08.txt AC 4 ms 512 KB
1_09.txt AC 4 ms 512 KB
1_10.txt AC 5 ms 512 KB
1_11.txt AC 4 ms 512 KB
1_12.txt AC 4 ms 512 KB
1_13.txt AC 4 ms 512 KB
1_14.txt AC 4 ms 512 KB
1_15.txt AC 4 ms 512 KB
1_16.txt AC 4 ms 512 KB
1_17.txt AC 4 ms 512 KB
1_18.txt AC 4 ms 512 KB
1_19.txt AC 4 ms 512 KB
1_20.txt AC 4 ms 512 KB
1_21.txt AC 5 ms 512 KB
1_22.txt AC 4 ms 512 KB
1_23.txt AC 5 ms 512 KB
1_24.txt AC 4 ms 512 KB
1_25.txt AC 5 ms 512 KB
1_26.txt AC 4 ms 512 KB
1_27.txt AC 4 ms 512 KB
1_28.txt AC 4 ms 512 KB