Backpacking

#include <iostream>
#include <cmath>

#include <string>

int main(int argc, char *argv[])
{
    if (argc != 2)
        return (0);

    std::string str = argv[1];

    size_t pos = str.find_first_of(" ");

    std::string str_a = str.substr(0, pos);
    std::string str_b = str.substr(pos + 1);

    int a = std::stoi(str_a);
    int b = std::stoi(str_b);
    if (a < 0 || a > pow(10, 6))
        return (0);
    if (b < 0 || b > pow(10, 6))
        return (0);
    std::cout << (a + b);
    return (0);
}

Test 1

Verdict: WRONG ANSWER

Test 2

Verdict: WRONG ANSWER

Test 3

Verdict: WRONG ANSWER

Test 4

Verdict: WRONG ANSWER