OJ Board

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#include<iostream>
//#include<cstdio>
using namespace std;

int main()
{
    //freopen("in.txt","r",stdin);
    int n,m,carry,j;
    short temp;
    cin>>n;
    for(int i=0;i<n;i++)
    {
        if(i) cout<<endl;
        carry=0;
        cin>>m;
        short int a[m],b[m],ans[m];
        for(j=m-1;j>=0;j--)
            cin>>a[j]>>b[j];
        for(j=0;j<m;j++)
        {
            temp=a[j]+b[j];
            ans[j]=temp%10+carry;
            carry=temp>9;
        }
        for(j=m-1;j>=0;j--)
            cout<<ans[j];
        cout<<endl;
    }
    return 0;
}

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1

3
1 2
7 2
2 8

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400

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import java.util.Scanner;

public class Main {

	private static Scanner scanner;

	public static void main(String[] args) {
		scanner = new Scanner(System.in);
		int n, m;
		short temp, carry = 0;
		char ch;
		short[] firstAra = new short[1000005];
		short[] secondAra = new short[1000005];


		while (scanner.hasNext()) {
			n = scanner.nextInt();
			for (int j = 0; j < n; j++) {
				m = scanner.nextInt();
				for (int k = 0; k < m; k++) {
					firstAra[k] = scanner.nextShort();
					secondAra[k] = scanner.nextShort();
				}
				String string = "";
				carry = 0;
				for (int k = m - 1; k >= 0; k--) {
					temp = (short) (firstAra[k] + secondAra[k] + carry);
					if (temp > 9) {
						temp = (short) (temp % 10);
						carry = 1;
					} else {
						carry = 0;
					}
					ch = (char) temp;
					ch += 48;
					string = string + ch;
				}
				if (carry == 1) {
					string = string + 1;
				}
				StringBuffer buffer = new StringBuffer(string);
				System.out.println(buffer.reverse() + "\n");
			}

		}

	}

}

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import java.math.BigInteger;
import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner in = new Scanner(System.in);
		int trials = in.nextInt();
		StringBuilder a;
		StringBuilder b;
		int l;
		for (int tr = 1; tr <= trials; tr++) {
			a=new StringBuilder("");
			b=new StringBuilder("");
			l=in.nextInt();
			for(int j=0;j<l;j++)
			{
				a=a.append(in.next());
				b=b.append(in.next());
			}
			BigInteger z = new BigInteger(a.toString());
			BigInteger x = new BigInteger(b.toString());
			System.out.println(z.add(x));
			if(tr!=trials)
				System.out.println("");
		}

	}
}