結果

問題 No.1410 A lot of Bit Operations
ユーザー QCFiumQCFium
提出日時 2021-02-26 22:54:11
言語 C++14
(gcc 13.3.0 + boost 1.87.0)
結果
AC  
実行時間 2 ms / 2,000 ms
コード長 3,337 bytes
コンパイル時間 1,743 ms
コンパイル使用メモリ 171,092 KB
実行使用メモリ 5,248 KB
最終ジャッジ日時 2024-10-02 15:37:27
合計ジャッジ時間 3,005 ms
ジャッジサーバーID
(参考情報)
judge1 / judge5
このコードへのチャレンジ
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ファイルパターン 結果
sample AC * 2
other AC * 44
権限があれば一括ダウンロードができます

ソースコード

diff #
プレゼンテーションモードにする

#include <bits/stdc++.h>
int ri() {
int n;
scanf("%d", &n);
return n;
}
template<int mod>
struct ModInt{
int x;
ModInt () : x(0) {}
ModInt (int64_t x) : x(x >= 0 ? x % mod : (mod - -x % mod) % mod) {}
ModInt &operator += (const ModInt &p){
if ((x += p.x) >= mod) x -= mod;
return *this;
}
ModInt &operator -= (const ModInt &p) {
if ((x += mod - p.x) >= mod) x -= mod;
return *this;
}
ModInt &operator *= (const ModInt &p) {
x = (int64_t) x * p.x % mod;
return *this;
}
ModInt &operator /= (const ModInt &p) {
*this *= p.inverse();
return *this;
}
ModInt &operator ^= (int64_t p) {
ModInt res = 1;
for (; p; p >>= 1) {
if (p & 1) res *= *this;
*this *= *this;
}
return *this = res;
}
ModInt operator - () const { return ModInt(-x); }
ModInt operator + (const ModInt &p) const { return ModInt(*this) += p; }
ModInt operator - (const ModInt &p) const { return ModInt(*this) -= p; }
ModInt operator * (const ModInt &p) const { return ModInt(*this) *= p; }
ModInt operator / (const ModInt &p) const { return ModInt(*this) /= p; }
ModInt operator ^ (int64_t p) const { return ModInt(*this) ^= p; }
bool operator == (const ModInt &p) const { return x == p.x; }
bool operator != (const ModInt &p) const { return x != p.x; }
explicit operator int() const { return x; }
ModInt &operator = (const int p) { x = p; return *this;}
ModInt inverse() const {
int a = x, b = mod, u = 1, v = 0, t;
while (b > 0) {
t = a / b;
a -= t * b;
std::swap(a, b);
u -= t * v;
std::swap(u, v);
}
return ModInt(u);
}
friend std::ostream & operator << (std::ostream &stream, const ModInt<mod> &p) {
return stream << p.x;
}
friend std::istream & operator >> (std::istream &stream, ModInt<mod> &a) {
int64_t x;
stream >> x;
a = ModInt<mod>(x);
return stream;
}
};
typedef ModInt<1000000007> mint;
template<int mod> struct MComb {
using mint = ModInt<mod>;
std::vector<mint> fact;
std::vector<mint> inv;
MComb (int n) { // O(n + log(mod))
fact = std::vector<mint>(n + 1, 1);
for (int i = 1; i <= n; i++) fact[i] = fact[i - 1] * mint(i);
inv.resize(n + 1);
inv[n] = fact[n] ^ (mod - 2);
for (int i = n; i--; ) inv[i] = inv[i + 1] * mint(i + 1);
}
mint ncr(int n, int r) {
return fact[n] * inv[r] * inv[n - r];
}
mint npr(int n, int r) {
return fact[n] * inv[n - r];
}
mint nhr(int n, int r) {
assert(n + r - 1 < (int) fact.size());
return ncr(n + r - 1, r);
}
};
int main() {
int64_t n;
std::cin >> n;
std::string s;
std::cin >> s;
if (n == 0) {
printf("%d\n", (int) std::count(s.begin(), s.end(), 'o'));
return 0;
}
mint p2 = mint(2) ^ n;
mint p22 = mint(2) ^ (2 * n);
mint res = 0;
for (int i = 0; i < 8; i++) {
if (s[i] != 'o') continue;
for (int j = 0; j < 4; j++) {
mint one = 0;
for (int k = 0; k < 4; k++) {
if ((i >> j & 1) != (i >> k & 1)) one -= 1;
else one += 1;
}
one /= 4;
res += ((p2 / 2 - 1) * one + (p2 / 2)) * (p22 / 4);
}
/*
for (int j = 0; j < 1 << n; j++) {
for (int k = 0; k < 1 << n; k++) {
int cur_res = 0;
for (int l = 0; l < n; l++) {
int cur = (j >> l & 1) << 1 | (k >> l & 1);
cur_res += ((i >> cur & 1) ? 1 : -1) * (1 << l);
}
res += std::abs(cur_res) + 1;
}
}*/
res += p22;
}
std::cout << res << std::endl;
return 0;
}
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