[Blue Bridge Cup 2015 Preliminary] Addition to multiplication

The idea is still very simple, don't think about it complicated

#include<stdio.h>

int main(){
    
    
	int i,j,k;
	for(i=1;i<=50;i++){
    
    
		for(j=i+2;j<=50;j++){
    
    
			k=1225-i-i-1-j-j-1+i*(i+1)+j*(j+1);
			if(k==2015&&i!=10){
    
    
				printf("%d\n",i);
				return 0;
			}
		}
	}
}