常用库函数重载

常用库函数重载

using i64 = long long;
using i128 = __int128;/**   上取整下取整*    2023-10-15: https://codeforces.com/contest/293/submission/228297248
**/
i64 ceilDiv(i64 n, i64 m) {if (n >= 0) {return (n + m - 1) / m;} else {return n / m;}
}i64 floorDiv(i64 n, i64 m) {if (n >= 0) {return n / m;} else {return (n - m + 1) / m;}
}/**   最大值赋值*    2023-09-30: https://codeforces.com/contest/1874/submission/226069129
**/
template<class T>
void chmax(T &a, T b) {if (a < b) {a = b;}
}/**   最大公约数*    -: -
**/
i128 gcd(i128 a, i128 b) {return b ? gcd(b, a % b) : a;
}/**   精确开平方*    2024-03-02: https://qoj.ac/submission/343317
**/
i64 sqrt(i64 n) {i64 s = std::sqrt(n);while (s * s > n) {s--;}while ((s + 1) * (s + 1) <= n) {s++;}return s;
}/**   精确开平方*    2023-09-19: https://qoj.ac/submission/183430
**/
i64 get(i64 n) {i64 u = std::sqrt(2.0L * n);while (u * (u + 1) / 2 < n) {u++;}while (u * (u - 1) / 2 + 1 > n) {u--;}return u;
}/**   求 Log*    2024-07-23: https://codeforces.com/contest/1995/submission/272110180
**/
int logi(int a, int b) {int t = 0;i64 v = 1;while (v < b) {v *= a;t++;}return t;
}int llog(int a, int b) {if (a <= b) {int l = logi(a, b);return (l == 0 ? 0 : std::__lg(2 * l - 1));}int l = logi(b, a + 1) - 1;assert(l > 0);return -std::__lg(l);
}