1963-Minimum-Number-of-Swaps-to-Make-the-String-Balanced.cpp

class Solution {
public:
    int minSwaps(string s) {
        int size = 0;
        int n = s.size();
        for(int i=0; i<n; i++){ 
            char ch = s[i];
            if(ch == '['){
                size++;
            }
            else if(size>0){
                size--;
            }
        }
    return (size+1)/2;
    }
};