getting WA in wtch

Please tell me the problem bcoz program is doing what was asked in problem.

#include <stdio.h>

int main(void) {
int T,N,u=0,j,k;
scanf("%d",&T);
for(j=0;j<T;j++)
{
scanf("%d",&N);
int s[N];
for(k=0;k<N;k++)
scanf("%d",&s[k]);
for(k=0;k<N;k++)
{if(k==0&&s[k+1]==0&&s[k]==0)
{u+=1;s[k]=1;}
else if(k>0&&k<N-1)
{if(s[k-1]==0&&s[k+1]==0&&s[k]==0)
{u+=1;s[k]=1;
}}
else if(k==N-1)
if(s[k-1]==0&&s[k]==0)
{u+=1;s[k]=1;}
}
printf("%d \n",u);u=0;
}
return 0;
}

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