mirror of
https://github.com/amadvance/snapraid.git
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98 lines
2.7 KiB
C
98 lines
2.7 KiB
C
/*
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* Copyright (C) 2013 Andrea Mazzoleni
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <stdio.h>
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unsigned combo(unsigned mask, unsigned pick, unsigned from, unsigned to, unsigned* map)
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{
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unsigned i;
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unsigned count;
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if (pick == 0) {
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map[0] = mask;
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return 1;
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}
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count = 0;
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for(i=from;i<=to;++i)
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count += combo(mask | (1 << i), pick - 1, i + 1, to, map + count);
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return count;
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}
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void print_combo(unsigned n)
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{
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unsigned map[10000];
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unsigned count;
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unsigned i, j, k;
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printf("/**\n");
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printf(" * Combinations of %u elements.\n", n);
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printf(" * Ends is marked with first element as -1.\n");
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printf(" */\n");
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printf("static int combo[][32][8] = {\n"); /* fixed value 32/8, change them if changing maximum n */
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for(i=1;i<=n;++i) {
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count = combo(0, i, 0, n - 1, map);
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printf("\t/* combinations of %u of %u elements */\n", i, n);
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printf("\t{\n");
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for(j=0;j<count;++j) {
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unsigned mask = map[j];
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printf("\t\t{ ");
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for(k=0;mask;++k) {
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if (mask & 1) {
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printf("%u", k);
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mask >>= 1;
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if (mask)
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printf(", ");
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} else {
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mask >>= 1;
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}
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}
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printf(" },\n");
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}
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printf("\t\t{ -1 }\n");
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printf("\t},\n");
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}
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printf("};\n\n");
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}
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int main(void)
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{
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printf("/*\n");
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printf(" * Copyright (C) 2013 Andrea Mazzoleni\n");
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printf(" *\n");
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printf(" * This program is free software: you can redistribute it and/or modify\n");
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printf(" * it under the terms of the GNU General Public License as published by\n");
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printf(" * the Free Software Foundation, either version 2 of the License, or\n");
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printf(" * (at your option) any later version.\n");
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printf(" *\n");
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printf(" * This program is distributed in the hope that it will be useful,\n");
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printf(" * but WITHOUT ANY WARRANTY; without even the implied warranty of\n");
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printf(" * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the\n");
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printf(" * GNU General Public License for more details.\n");
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printf(" *\n");
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printf(" * You should have received a copy of the GNU General Public License\n");
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printf(" * along with this program. If not, see <http://www.gnu.org/licenses/>.\n");
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printf(" */\n");
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printf("\n");
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print_combo(6);
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return 0;
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}
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