mirror of
https://git.sb/baoshuo/OI-codes.git
synced 2024-11-27 14:36:27 +00:00
D - Jzzhu and Numbers
https://codeforces.com/contest/449/submission/184326882
This commit is contained in:
parent
a273b46d34
commit
088387d5e4
52
Codeforces/449/449.cpp
Normal file
52
Codeforces/449/449.cpp
Normal file
@ -0,0 +1,52 @@
|
||||
#include <iostream>
|
||||
|
||||
using std::cin;
|
||||
using std::cout;
|
||||
const char endl = '\n';
|
||||
|
||||
const int mod = 1e9 + 7;
|
||||
|
||||
int n, s[1 << 20], ans;
|
||||
|
||||
int binpow(int a, int b) {
|
||||
int res = 1;
|
||||
|
||||
while (b) {
|
||||
if (b & 1) res = static_cast<long long>(res) * a % mod;
|
||||
a = static_cast<long long>(a) * a % mod;
|
||||
b >>= 1;
|
||||
}
|
||||
|
||||
return res;
|
||||
}
|
||||
|
||||
int main() {
|
||||
std::ios::sync_with_stdio(false);
|
||||
cin.tie(nullptr);
|
||||
|
||||
cin >> n;
|
||||
|
||||
for (int i = 1, x; i <= n; i++) {
|
||||
cin >> x;
|
||||
|
||||
s[(1 << 20) - 1 - x]++;
|
||||
}
|
||||
|
||||
for (int i = 0; i < 20; i++) {
|
||||
for (int j = 0; j < 1 << 20; j++) {
|
||||
if (j & (1 << i)) {
|
||||
s[j] += s[j ^ (1 << i)];
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
ans = binpow(2, n);
|
||||
|
||||
for (int i = 0; i < (1 << 20) - 1; i++) {
|
||||
ans = (static_cast<long long>(ans) + (__builtin_popcount(i) % 2 ? -1 : 1) * binpow(2, s[i])) % mod;
|
||||
}
|
||||
|
||||
cout << (ans + mod) % mod << endl;
|
||||
|
||||
return 0;
|
||||
}
|
Loading…
Reference in New Issue
Block a user