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- #include <stdio.h>
- #include <stdlib.h>
- #define natural unsigned short // csf sa mai pierd timp
- unsigned v[8], nr;
- void Init(natural k) {
- v[k] = 0;
- }
- natural Succesor(natural k) {
- if (v[k] < 9) {
- v[k]++;
- if (v[k] == 2)v[k]++;
- return 1;
- }
- return 0;
- }
- natural Valid(natural k) {
- natural i;
- if (v[k] % 2 == 1) return 1;
- for (i = 1; i < k; i++)
- if (v[i] == v[k])
- return 0;
- return 1;
- }
- natural valid2() {
- natural nr = 0, i;
- for (i = 1; i <= 6; i++) {
- if (v[i] % 2 == 0) nr++;
- }
- if (nr != 3) return 0;
- return 1;
- }
- natural Solution(natural k) {
- return (k == 6) && valid2();
- }
- void Print() {
- natural i;
- printf("0721 ");
- for (i = 1; i <= 6; i++)
- printf("%d", v[i]);
- printf(";\n");
- }
- void Back() {
- natural k = 1, isS, isV;
- Init(k);
- while (k > 0) {
- isS = 0; isV = 0;
- if (k <= 6)
- do {
- isS = Succesor(k);
- if (isS) isV = Valid(k);
- } while (isS && !isV);
- if (isS)
- if (Solution(k))
- Print();
- else {
- k++;
- Init(k);
- }
- else
- k--;
- }
- }
- int main() {
- Back();
- system("pause");
- return 0;
- }
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