lazy propagation

[todo]

competitive-programming/SegmentTree.h

Lines 43 to 48 in 29be4b1

	///TODO lazy propagation
	private:
	//represents the segment tree.
	T *tree;
	//builds the segment tree.

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This issue was generated by todo based on a TODO comment in 29be4b1. It's been assigned to @aashutoshrathi because they committed the code.