经过实验证明这个命令优化效果最好,把我的 1.2S 的 FFT 优化到了 0.4S使用 pragma 命令优化程序: #pragmaGCC optimize("Ofast,no-stack-protector") 实用优化项: #pragmaGCC optimize("Ofast")#pragmaGCC target("sse3","sse2","sse")#pragmaGCC target("
#pragma GCC optimize("O2") //开启O2优化 #pragma GCC optimize("Ofast") //开启Ofast优化 #pragma GCC optimize("Os") //开启Os优化 #pragma GCC optimize("Og") //开启Og优化 2.警告指令 #pragma GCC diagnostic error "-Wformat" //将格式化警告转换为错误 #pragma GCC diagnostic warning "-Wuniniti...
#pragma GCC optimize("Ofast") #pragma GCC target("avx,avx2,fma") I usually add these two lines of pragmas in my code. But on submitting it to the POI judge, it gives runtime error 4, and when excluded, it doesn't. Would also be nice if someone could elaborate on why Runtime er...
Pragma 是一种指令,用于告诉编译器如何处理代码。在 C 和 C++ 中,Pragma 指令通常用于控制编译器的优化行为、警告行为、对 齐方式等。本文将详细介绍 Pragma 的用法。 1.优化指令 #pragma GCC optimize("O2") //开启 O2 优化 #pragma GCC optimize("Ofast") //开启 Ofast 优化 #pragma GCC optimize("Os"...
#pragma GCC optimize("unroll-loops") #include <bits/stdc++.h> using namespace std; #ifdef TOWRIST #define debug(...) cout << "[" << #__VA_ARGS__ << "]:", debug_out(__VA_ARGS__); #else #define debug(...); ...
#pragma GCC optimize("Ofast") #include <cmath> #include <iostream> #include <vector> #define N 10000005 using namespace std; // Boolean array for Prime Number vector<bool> prime(N, true); // Sieve implemented to find Prime // Number void sieveOfEratosthenes() { for (int i = 2; ...