#define L 12
#define N 924 /* N = choose(L, L / 2) */
static int cnt[1 << L], bb[N], n;
void init() {
int b;
cnt[0] = 0;
for (b = 1; b < 1 << L; b++)
if ((cnt[b] = cnt[b & b - 1] + 1) == L / 2)
bb[n++] = b;
}
int encode(int n, int x, int y) {
int l;
init();
for (l = 0; l < L; l++)
if ((bb[x] & 1 << l) == 0 && (bb[y] & 1 << l) != 0)
return l + 1;
return 0;
}
#define L 12
#define N 924 /* N = choose(L, L / 2) */
static int cnt[1 << L], bb[N], n;
void init() {
int b;
cnt[0] = 0;
for (b = 1; b < 1 << L; b++)
if ((cnt[b] = cnt[b & b - 1] + 1) == L / 2)
bb[n++] = b;
}
int decode(int n, int x, int y) {
x--, y--;
return (bb[x] & 1 << y) == 0;
}
Compilation message
encoder.c: In function 'init':
encoder.c:11:27: warning: suggest parentheses around '-' in operand of '&' [-Wparentheses]
11 | if ((cnt[b] = cnt[b & b - 1] + 1) == L / 2)
| ~~^~~
decoder.c: In function 'init':
decoder.c:11:27: warning: suggest parentheses around '-' in operand of '&' [-Wparentheses]
11 | if ((cnt[b] = cnt[b & b - 1] + 1) == L / 2)
| ~~^~~
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Incorrect |
74 ms |
23904 KB |
잘못된 접근입니다. |
2 |
Incorrect |
75 ms |
23924 KB |
잘못된 접근입니다. |