#522 (Div. 2)—B. Personalized Cup（水题）
B. Personalized Cup time limit per test 1 second m …
#522 (Div. 2）—A. Kitchen Utensils（水题）
A. Kitchen Utensils time limit per test 1 second m …
二分的边界
while(l<=r) { int mid=(l+r)/2;//min=l+(r-l)/2 防 …
B. Personalized Cup time limit per test 1 second m …
A. Kitchen Utensils time limit per test 1 second m …
while(l<=r) { int mid=(l+r)/2;//min=l+(r-l)/2 防 …