poj 1063 Flip and Shift

#include<stdio.h>#include<math.h>int main(){    int d[30],n,c;    scanf("%d",&n);    while(n>0)    {        int ow=0,ew=0;        scanf("%d",&c);        for(int i=0;i<c;i++) scanf("%d",&d[i]);        if(c%2==1) printf("YESn");        else        { for(int i=0;i<c;i++) {     if(d[i]==0)     {         if(i%2==0)  ow++;         else  ew++;     } } if(abs(ow-ew)<2)     printf("YESn"); else     printf("NOn");        }        n--;    }    return 0;}