Untitled

class Solution {
public:
    int leastInterval(vector<char>& arr, int t) {
        priority_queue<pair<int,int>> q;  // count , letter
        vector<int>v(26,0);
        int res = 0;
        int n = arr.size();
        for(auto i : arr)
            v[i-'A']++;
        
        for(int i = 0; i<26; i++)
            if(v[i]){
                q.push(make_pair(v[i],0));
            }
    int tt = 0;
    while(q.size()){
        pair<int,int> p = q.top();
        if(p.second<=tt){
            q.pop();
         if(p.first>1)   q.push({p.first-1 , tt+t});
          
        }
        tt++;
        res++;
    }
    return res;

    }
};