Fazil's faculty gave him a string S consisting of only 1s and 0s and he need to find the number of substrings which start and end both in 1.In this problem, a substring is defined as a sequence of continuous characters S

 #include <stdio.h>

#include<string.h>

int main()

{

char string;

int string1,test;

scanf("%d",&test);

while(test--)

{

int sum=0,i;

    scanf("%d",&string1);

    char str[string1];

    scanf("%s",str);

    for(i=0;i<strlen(str);i++)

    if(str[i]=='1') sum++;

    int ans=sum*(sum+1)/2;

    printf("%d\n",ans);

}

scanf("%c",&string);

return 0;

}

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