为什么此题是普及-

#include<iostream> #include<algorithm> #include<string> #include<queue> #include<stack> #include<iomanip> using namespace std; int main() { int a, b; cin >> a >> b; cout << a + b; return 0; }

#include<bits/stdc++.h>头文件 using namespace std; int main(){ int a,b; cin>>a>>b; cout<<a+b; return 0; }

#include<bits/stdc++.h> using namespace std; int main(){ int a,b; cin>>a>>b; cout<<a+b; return 0; }

#include <iostream> using namespace std; int main(){ int a,b; cin>>a>>b; cout<<a+b; return 0; }

#include<iostream> using namespace std; int main(){ int a,b; cin >> a >> b; cout << a+b; return 0; }

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#include <iostream> using namespace std; int main(){ int a,b; cin>>a>>b; cout<<a+b; return 0; }

#include <iostream> using namespace std; int main(){ int a,b; cin>>a>>b; cout<<a+b; return 0; }

#include <iostream> using namespace std; int main(){ int a,b; cin>>a>>b; cout<<a+b; return 0; }