HDU 4950 monster (formula)

HDU 4950 monster

Question Link

Q: Given the monster's blood volume H, your attack power a, and monster's blood return power B. You attack K for a second break and ask if you can kill the monster.

Train of Thought: sign in To the question. Pay attention to the last point. If the blame is killed, the blame will not go back to the blood.

Ideas:

# Include <cstdio> # include <cstring> typedef long ll; ll H, A, B, K; bool solve () {if (a> = h) return true; if (B> = A) return false; If (H-(k-1) * A + B * (k-1) <= A) return true; ll s =-A * k + B * (k + 1); If (S> = 0) return false; return true;} int main () {int CAS = 0; while (~ Scanf ("% i64d % i64d % i64d % i64d", & H, & A, & B, & K) & H) {printf ("case # % d :", + + CAS); printf ("% s \ n", solve ()? "Yes": "no");} return 0 ;}