#include "bits/stdc++.h"
using namespace std;
vector<int>res;
void solve(int l,int r){
    if(l>r)return;
    res.push_back(r+1);
    solve(l+1,r);
}
int main(){
    solve(0,1000000);
    cout<<res.size()<<endl;
}

Reading symbols from Solution...done.
[New LWP 357307]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
Core was generated by `./Solution'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0  0x000000000040125b in solve (l=698913, r=1000000) at Solution.cpp:6
6	    res.push_back(r+1);
To enable execution of this file add
	add-auto-load-safe-path /usr/local/lib64/libstdc++.so.6.0.25-gdb.py
line to your configuration file "//.gdbinit".
To completely disable this security protection add
	set auto-load safe-path /
line to your configuration file "//.gdbinit".
For more information about this security protection see the
"Auto-loading safe path" section in the GDB manual.  E.g., run from the shell:
	info "(gdb)Auto-loading safe path"