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a year ago
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bool findRedundantBrackets(string &s) { stack<char> stack; for(auto i:s){ if(i=='(' || i=='+' || i=='-' || i=='*' || i=='/') { stack.push(i); }else if(i==')'){ char isR=true; while(stack.top()!='(' && !stack.empty()){ char t=stack.top(); if (t=='+' || t=='-' || t=='*' || t=='/') isR=false;; stack.pop(); //remove operator } if(isR==true) return true; stack.pop(); //remove op brackets } } return false; }