Backpacking

#include <iostream>  
#include <cstring> 
using namespace std; 

int main() {
    char str[100];   
    cin.getline(str, 100);
    char *ptr;
    ptr = strtok(str, " "); 
    
    long ans = 0;
    while (ptr != NULL)  
    {  
        ans += stoi(ptr);
        ptr = strtok (NULL, " ");  
    } 

    return ans;
}

Test 1

Verdict: RUNTIME ERROR

Test 2

Verdict: RUNTIME ERROR

Test 3

Verdict: RUNTIME ERROR

Test 4

Verdict: RUNTIME ERROR