#include <stdio.h> /** * * 6 x x * x x x * ----------- * x x x * x x x x * x 5 x 5 * ------------ * x x 5 x 4 x * * */ int main(void) { printf("Hello World!\n"); //a1为奇数,(a1,b3其一为5) //b1=1,b2>1,b3>2 int step = 0; for (int a1 = 1; a1 <10 ; a1 += 2) { for (int a2 = 0; a2 <10 ; a2++) { for (int b2 = 1; b2 <10 ; b2++) { for (int b3 = 1; b3 <10 ; b3 += 2) { if(a1!=5&&b3!=5) continue; step++; int one = 600+a2*10+a1; int two = b2*one; int tree = b3*one; int sum = one+two*10+tree*100; // printf("[==]: 6%d%d x %d%d1 = %d\n",a2,a1,b3,b2,sum); if(tree/100%10 == 5 &&a2+a1*b2%10 == 4 &&sum/1000%10 == 5){ printf("6%d%d x %d%d1 = %d\n",a2,a1,b3,b2,sum); } } } } } printf("[over step]: %d\n",step); return 0; }