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提升C++输入输出性能的三个方法

做题的时候,由于数据量大,很多情况下得用scanf和printf代替cin和cout用于输入输出。难道C++不行么?

百度了一下,有三条建议用于提高C++的输入输出速度:

  1. At the first line in main function,add :std::ios_base::sync_with_stdio(false).which cancel theSynchronization between <iostream> and <cstdio>;
  2. At the second line in main function,add: std::cin.tie(0).which leads to that cin ties nothing.cin ties cout at first.
  3. For all endl, use ‘\n‘ or"\n" instead.
例如:
<pre name="code" class="cpp">#include<iostream>
#include<algorithm>
#include<cstring>
using namespace std;
int main()
{
    std::ios::sync_with_stdio(false);
    cin.tie(0);
    int n,m;
    cin>>n>>m;
    cout<<n<<" "<<m<<"\n";
    return 0;
}


提升C++输入输出性能的三个方法