

Sequence operationTime Limit: 10000/5000 MS (Java/Others) Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 10524 Accepted Submission(s): 3184 Problem Description lxhgww got a sequence contains n characters which are all '0's or '1's. We have five operations here: Change operations: 0 a b change all characters into '0's in [a , b] 1 a b change all characters into '1's in [a , b] 2 a b change all '0's into '1's and change all '1's into '0's in [a, b] Output operations: 3 a b output the number of '1's in [a, b] 4 a b output the length of the longest continuous '1' string in [a , b] Input T(T<=10) in the first line is the case number. Each case has two integers in the first line: n and m (1 <= n , m <= 100000). The next line contains n characters, '0' or '1' separated by spaces. Then m lines are the operations: op a b: 0 <= op <= 4 , 0 <= a <= b < n. Output For each output operation , output the result. Sample Input
Sample Output
Author lxhgww&&sh¨£áÌ Source  
