CustomStack

class CustomStack {
    vector<int>obj;int size;
public:
    CustomStack(int maxSize) {
        size=maxSize;
    }
    
    void push(int x) {
        if(obj.size()<size){
            obj.push_back(x);
        }
    }
    
    int pop() {
        if(!obj.empty()){
            int res=obj.back();
            obj.pop_back();
            return res;
        }
        return -1;
    }
    
    void increment(int k, int val) {
        if(obj.size()<k){
            for(int i=0;i<obj.size();i++){
                obj[i]+=val;
            }
        }
        else{
            int i=0;
            while(k>0){
                obj[i++]+=val;
                k--;
            }
        }
    }
};

/**
 * Your CustomStack object will be instantiated and called as such:
 * CustomStack* obj = new CustomStack(maxSize);
 * obj->push(x);
 * int param_2 = obj->pop();
 * obj->increment(k,val);
 */