Kalkulator z bajerami, C++ (gcc)

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#include <iostream>
#include <string.h>
#include <cstdlib>
using namespace std;

int main()
{
    int testy=0,x;
    char tab1[12];
    char tab2[12];
    
    scanf("%d",&testy);
        for(int i=0;i<testy;i++)
        {
            scanf("%s",tab1);
            if((tab1[0]<48)||(tab1[0]>57))
                {
                    scanf("%s",tab2);
                    if((tab2[0]<48)||(tab2[0]>57))
                    {
                        printf("%s%s\n", tab1, tab2);
                    }
                    else
                    {
                        int x = atoi(tab2);
                        printf("%c\n", tab1[x-1]);
                    }
                }
                else
                {
                    int x = atoi(tab1);
                    scanf("%s",tab2);
                    if((tab2[0]<48)||(tab2[0]>57))
                    {
                        printf("%c\n", tab2[x-1]);
                    }
                    else
                    {
                        printf("%d\n", atoi(tab1)+atoi(tab2));
                    }
                }
        }
}

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Compilation time: 0.42 sec, absolute running time: 0.12 sec, cpu time: 0.06 sec, memory peak: 3 Mb, absolute service time: 0,55 sec