if(ch == ' '){if(i != 0 && s[i-1] != ' ') break; continue;} else if(ch == '-'){if(i != 0 && s[i-1] != ' ') break; neg = true;} else if(ch == '+'){if(i != 0 && s[i-1 ...
Given a binary tree, we install cameras on the nodes of the tree. Each camera at a node can monitor its parent, itself, and its immediate children. Calculate the minimum number of cameras needed to ...
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