BZOJ temporarily closed, it is not a brush BZOJ
If CF 325E The Red Button down to only 2x, will form a number of rings, so we can go to 2x + 1 ring strung together
CF 339E Three Swaps enumerate each endpoint, which section can be found flipping explosion, do not pay attention to the output of the anti-lose
CC COOK109A RICHSTR If this interval is less expensive must have a length of the section 3 is expensive, and maintenance prefix directly O (1) Analyzing
Total of three questions