Using of dynamic memory allocation for the long string

char * s = new char [10000000];
//..
delete [] s;

allowed me to avoid the crash problem.
Suppose it would be helpful for someone.

A better idea is to declear the array outside any functions.
#include ...
char s[1000000000000000000];
int main(){}
If you do so, it won't take up xxxxGB RAM. Instead, it depends on which part of the array you used.
For example, you only use 1-10000 of the array, it will use 10KB mem.
And that's cool.

You are not right.

why