mindsum.cpp

#include <iostream>

using namespace std;
int level = 0;

int digitsum(long long int n) {
    int result = 0;
    while (n) {
        result += n%10;
        n /= 10;
    }
    return result;
}

void func(long long int n, long long int d, long long int *min, long long int *count) {
    if (level < 13) {
        level++;
        if (n < *min) {
            *min = n;
            if (*count > level) *count = level;
        }
        func(n+d, d, min, count);
        func(digitsum(n), d, min, count);
        
    }
    level --;
    return ;
}

int main(void) {
    int t;
    cin >> t;
    
    while (t--) {
        long long int n, d, min = 100000, count = 10000000;
        cin >> n >> d;
        
        func(n, d, &min, &count);
    }
}

Starting program: /media/ujjwal/DataDisk/krow/Myprojects/GitHub/Offline/mindsum
INPUT - 1 2 3

Program received signal SIGSEGV, Segmentation fault.
0x000055555555499a in func (n=2, d=3, min=0x7fffffffddf8, count=0x7fffffffde00) at mindsum.cpp:22

Due to a large number of recursive calls, segmentation fault occurs

The stack is normally limited by a resource limit. You can see what the default settings are on your installation using
ulimit -a
See here how to change the stack size in a program.