why he made this condition in his code in this problem : https://codeforces.com/contest/1512/problem/E if(s — i >= 1LL * (len — 1) * len / 2 && len > 0) i am talking about s-i =>(len-1)*(len)/2 code : https://ideone.com/sPISxq
why he made this condition in his code in this problem : https://codeforces.com/contest/1512/problem/E if(s — i >= 1LL * (len — 1) * len / 2 && len > 0) i am talking about s-i =>(len-1)*(len)/2 code : https://ideone.com/sPISxq
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Because the sum of the remaining numbers can be at least (len-1)*len/2 (1+2+3+...+(len-1)). If this value plus i is bigger than s, it would be impossible to satisfy the condition after putting i to the region.