USACO Hamming Codes

Code

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/*
ID: wcr19961
PROG: hamming
LANG: C++11
*/
#include <cstdio>
#include <cstring>
#include <algorithm>
#include <cstdlib>
#include <string>
#include <vector>
using namespace std;
typedef long long LL;
const int maxn = 65;
int a[maxn];
int main() {
freopen("hamming.in", "r", stdin);
freopen("hamming.out", "w", stdout);
int n, b, d, p = 0, cnt = 0;
scanf("%d%d%d", &n, &b, &d);
putchar('0');
for (int i = 1; i < n; ++i) {
bool ok = false;
while (!ok) {
bool flag = true;
for (int j = 0; j < i; ++j) {
if (__builtin_popcount(p ^ a[j]) < d) {
flag = false;
break;
}
}
if (flag) {
ok = true;
break;
}
++p;
}
a[i] = p;
++cnt;
printf("%c%d", cnt % 10 ? ' ' : '\n', p++);
}
puts("");
return 0;
}

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