Recently I have done 711C - Coloring Trees, and I have found an overflow when I use min(a,b) function. More specifically, if I use: min(a, b + c) when a, b and c are long long and sum of b + c large than 32-bit integer then the sum b + c will be treated as 32-bits integer and hence the overflow.

but let say, if I use a temporary variable: long long tmp = b + c then min(a, tmp) will not overflow

What kind of behavior is this?

This is two submissions, one is overflow and the another one use a temporary variable will not overflow: Overflow: 285989412 Not overflow: 286024512