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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. typedef long long ll;
  4.  
  5. int main() {
  6. 	ll x,y;scanf("%lld %lld",&x,&y);
  7. 	ll sum=0,z=0;
  8. 	while(sum<x+y){sum+=++z;}
  9. 	if(x+y!=sum)return !printf("-1");
  10. 	ll ans=0;
  11. 	while(x>0){ans++,x-=z--;}
  12. 	printf("%lld",ans);	
  13. 	return 0;
  14. }
Success #stdin #stdout 0s 5508KB
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stdin
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7 13
stdout
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-1
https://ideone.com/tnjhTb
language:
C++ (gcc 8.3)
created:
2 years ago
visibility:
public

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