mixed.c

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#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <math.h>

int main(void)
{
    for (int m = 1230; m < 9876; ++m)
        {
            int m1=m / 1000;
            int m2=m / 100 % 10;
            int m3=m / 10 % 10;
            int m4=m % 10;
            if (m1*m2*m3==0)
                continue;
            int bits1=0;
            if((bits1 >>m1) % 2 == 0){
                bits1 += 1<<m1;
            }
            else
                continue;
            if((bits1 >>m2) % 2 == 0){
                bits1 += 1<<m2;
            }
            else
                continue;
            if((bits1 >>m3) % 2 == 0){
                bits1 += 1<<m3;
            }
            else
                continue;
            if((bits1 >>m4) % 2 == 0){
                bits1 += 1<<m4;
            }
            else
                continue;
            int n= m % 100;
            int n1= m3;
            int n2= m4;
            for (int p1 = 12300; p1 < 99877 ; ++p1)
                {
                    if (p1!=(m*m4))
                        continue;
                    int p11=p1 /10000;
                    int p12=p1 /1000 %10;
                    int p13=p1 /100 %10;
                    int p14=p1 /10 %10;
                    int p15=p1 %10;
                    if (p11==0)
                        continue;
                    if (p12==0)
                        continue;
                    if (p13!=m1)
                        continue;
                    if (p14!=p15)
                        continue;
                    int bits2=bits1;
                    if((bits2 >>p14) % 2 == 0){
                        bits2 += 1<<p14;
                    }
                    else
                        continue;
                    for (int p2 = 10234; p2 < 98765;++p2)
                        {
                            if (p2!=(m*n1))
                                continue;
                            int p21=p2 /10000;
                            int p22=p2 /1000 %10;
                            int p23=p2 /100 %10;
                            int p24=p2 /10 %10;
                            int p25=p2 %10;
                            if (p21!=m2)
                                continue;
                            if (p25==0)
                                continue;
                            int bits3=bits2;
                            if((bits3 >>p22) % 2 == 0){
                                bits3 += 1<<p22;
                            }
                            else
                                continue;
                            if((bits3 >>p23) % 2 == 0){
                                bits3 += 1<<p23;
                            }
                            else
                                continue;
                            if((bits3 >>p24) % 2 == 0){
                                bits3 += 1<<p24;
                            }
                            else
                                continue;
                            for(int result=123456; result <987654; ++result)
                                {
                                    if (result!=p1+(p2*10))
                                        continue;
                                    int r1= result / 100000;
                                    int r2= result / 10000 % 10;
                                    int r3= result / 1000 % 10;
                                    int r4= result / 100 % 10;
                                    int r5= result / 10 % 10;
                                    int r6= result %10;
                                    if (r1*r2*r3*r4*r5*r6==0)
                                        continue;
                                    printf("%d x %d = %d, with %d,%d as partial products, is a solution.\n",m,n,result,p1,p2);
                                }
                            
                        }
                }
        }
}