How to solve the uneasily discovered runtime error in acm and poj

It took a long time to refresh 2635 questions on poj today. There are always a variety of small faults. Finally, I tried a group of big data and passed the test. During submission, a runtime error occurs. Check the array and find that there is no cross-border error. Later, the search found that the array in the main of the local function was too large, resulting in stack overflow. It is defined as the global variable ac.

 

Reference:

Problem:
The reason for Stack Overflow is that the local variable a [1000] [1000] defined in main has nearly 4 MB space.
Local variables are allocated in the stack, so the 4 MB space is too large for the stack.

Original article address