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How can I solve this range quarry problem?
Let array a1,...,an, ( 1<= n <= 10^6 )
3 kinds of quarries, m in total ( 1<= m <= 10^6 )
1 l r k: add k to al, ..., ar
2 l r k: change ai ( l<= i <=r ) in to max( ai , k )
3 l r: print max( al, ... ,ar )
I think it could be done it at mlogn by segment tree. How can I?
