头文件 — 备忘
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/** * Youth gives you light please don‘t let it down. * ▄▄▄▄▄ * ???██████▄▄▄ _______________ * ▄▄▄▄▄ █████████▄ / * ????█████▌ ??▄ ??█ | Gotta go fast! | * ??█████▄▄ ?██████▄██ | _________________/ * ?▄▄▄▄▄ ??█▄?█════█? |/ * ???▄ ??███ ? ▄▄ * ▄███??██▄████████▄ ▄??????█▌ ______________________________ * ██?▄▄▄██?▄███? ??████ ▄██ █ \\ * ▄???▄██▄??▌████??????███ ▌▄▄????█_____________________________// * ▌ ??████?███??????██▌ * ?▄▄▄▄? ??████????▄██? * ??█████████? * ▄▄██?██████?█ * ▄██? ??? █ * ▄█ ?▌ * ▄▄▄▄█▌ ?█▄▄▄▄??▄ * ▌ ? ??▄▄▄? * ??▄▄? ██ * \ ???????????????????????????????????? ? * \- ▌ GNU C++17 7.3.0 ? ? * - ▌ ? * /- ▌ Go Go Go ! ? ? * / ???????????????????????????????????? ? * ██ **/ #include<iostream> #include<cstdio> #include<cstring> #include<algorithm> #include<bitset> #include<cassert> #include<cctype> #include<cmath> #include<cstdlib> #include<ctime> #include<deque> #include<iomanip> #include<list> #include<map> #include<queue> #include<set> #include<stack> #include<vector> using namespace std; typedef long long ll; typedef long double ld; #define ios ios::sync_with_stdio(false);cin.tie(0);cout.tie(0); #define mem(a, b) memset(a, b, sizeof(a)) const double pi = acos(-1.0); const double eps = 1e-6; const ll mod = 1e9 + 7; const int inf = 0x3f3f3f3f; const ll INF = 0x3f3f3f3f3f3f3f3f; const int maxn = 1e7 + 5;
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