#include<stdio.h>

int main(){

	unsigned long a=0;

	for(int i=0;i<100000;i++){

		for(int j=0;j<i;j++){

			a+=i;

			a-=i;

		}

		a+=i;

	}

	printf("%d",a);

	return 0;

}

704982704

--------------------------------

Process exited after 14.64 seconds with return value 0

#include<stdio.h>

int main(){

	register unsigned long a=0;

	for(register int i=0;i<100000;i++){

		for(register int j=0;j<i;j++){

			a+=i;

			a-=i;

		}

		a+=i;

	}

	printf("%d",a);

	return 0;

}

704982704

--------------------------------

Process exited after 2.954 seconds with return value 0