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Last active January 11, 2021 18:41
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FDCAJHxIBCFEH=FBAECIIJEGIH
// https://twitter.com/miharasan/status/1348654370921934849?s=20
#include <stdio.h>
long v[] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 };
long val(char alpha) {
return v[alpha - 'A'];
}
long vals(char *text) {
long res = 0;
for (int i = 0; text[i] != '\0'; ++i) {
res = res * 10 + val(text[i]);
}
return res;
}
void iterate(int o) {
if (o == 0) {
long v1 = vals("FDCAJH");
long v2 = vals("IBCFEH");
long v3 = vals("FBAECIIJEGIH");
if (v1 * v2 == v3) {
printf("%ld*%ld=%ld\n", v1, v2, v3);
}
} else {
long ov = v[o - 1];
for (int i = 0; i < o; ++i) {
long nv = v[i];
v[i] = ov;
v[o - 1] = nv;
iterate(o - 1);
v[i] = nv;
v[o - 1] = ov;
}
}
}
int main(void) {
iterate(10);
return 0;
}
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