Smallest String With A Given Numeric Value.cpp

/* 

    Solution by Rahul Surana
    
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The numeric value of a lowercase character is defined as its position (1-indexed) in the alphabet, 
so the numeric value of a is 1, the numeric value of b is 2, the numeric value of c is 3, and so on.

The numeric value of a string consisting of lowercase characters is defined as the sum of its characters' numeric values. 
For example, the numeric value of the string "abe" is equal to 1 + 2 + 5 = 8.

You are given two integers n and k. Return the lexicographically smallest string with length equal to n and numeric value equal to k.

Note that a string x is lexicographically smaller than string y if x comes before y in dictionary order, 
that is, either x is a prefix of y, or 
if i is the first position such that x[i] != y[i], then x[i] comes before y[i] in alphabetic order.



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*/


#include <bits/stdc++.h>

class Solution {
public:
    string getSmallestString(int n, int k) {
        string ans(n,'a');
        int x = k-n;
        int j = n-1;
        while(x>0){
            if(x>=25) { ans[j]+=25; x-=25; }
            else { ans[j] += x; x-=x; }
            j--;
        }
        return ans;
    }
};