#include <stdio.h> int ComFather (int x, int y){ if (x == 1 || y == 1){ return 1; } while (x != y){ if (x > y){ x = x / 2; }else{ y = y / 2; } } return x; } int main () { int x, y; while (scanf("%d%d", &x, &y) != EOF){ printf("%d\n", ComFather(x, y)); } return 0;...