#include <stdio.h> #include <string.h> char a[1000000], b[1000000]; int main() { int n; scanf("%d",&n); while (n --) { scanf("%s %s",a, b); int la = strlen(a); int lb = strlen(b); int sum = 0; for (int i = 0; i < la; i ++) { for (int j = 0; j < lb; j ++) { sum += (a[i] - '0') * (b[j] - '0'); } } printf("%d\n",sum); } return 0; }