#include<stdio.h>
int main(){
    int a,b,n;
    scanf("%d",&n);
    while(n--)
    {
        scanf("%d%d",&a,&b);
        printf("%d\n",a+b);
    }
}

注意多组数据。

#include<bits/stdc++.h>
#define int long long
#define INF 0x3f3f3f
using namespace std;
int t,a,b;
signed main(){
	cin>>t;
	while(t--){
		cin>>a>>b;
		cout<<a+b<<"\n";
	}
	return 0;
}

C :

#include<stdio.h>
int main()
{
    int a,b,n;
    scanf("%d",&n);
    while(n--){
        scanf("%d%d",&a,&b);
        printf("%d\n",a+b);
    }
    return 0;
}

C++ :

#include<iostream>
using namespace std;
int main(){
	int n;
	cin>>n;
	while(n--){
		int a,b;
		cin>>a>>b;
		cout<<a+b<<endl;
	}
}

Java :

import java.util.Scanner;
public class Main
{
  public static void main(String[] args)
  {
    Scanner sc=new Scanner(System.in);
    int t=sc.nextInt();
    while(t-->0)
    {
     int a=sc.nextInt();
     int b=sc.nextInt();
     System.out.println(a+b); 
    }
  }
}