Added solution for HackerRank Grading Students problem

Author: rahulmalhotra

Hackerrank/Algorithms/Easy/grading.cpp

@@ -0,0 +1,105 @@
+/*
+* Author:- Rahul Malhotra
+* Source:- Programming Vidya
+* Description:- Solution for HackerRank Grading Students problem
+* Problem Link:- https://www.hackerrank.com/challenges/grading/problem
+* Website:- www.programmingvidya.com
+*/
+
+#include <bits/stdc++.h>
+
+using namespace std;
+
+string ltrim(const string &);
+string rtrim(const string &);
+
+/*
+ * Complete the 'gradingStudents' function below.
+ *
+ * The function is expected to return an INTEGER_ARRAY.
+ * The function accepts INTEGER_ARRAY grades as parameter.
+ */
+
+vector<int> gradingStudents(vector<int> grades) {
+
+ // * Initializing variables
+ int length = grades.size();
+
+ // * Check each grade one by one
+ for(int i=0; i<length; i++) {
+
+ // * Calculating the remainder when grade is divided by 5
+ int rem = grades[i]%5;
+
+ /*
+ * If grade is more than 37 and
+ * remainder is greater than or equal to 3,
+ * add 5 - remainder to the grade
+ */
+ if(grades[i]>37 && rem>=3) {
+ grades[i] += 5-rem;
+ }
+ }
+
+ // * Return the grades vector
+ return grades;
+}
+
+int main()
+{
+ ofstream fout(getenv("OUTPUT_PATH"));
+
+ string grades_count_temp;
+ getline(cin, grades_count_temp);
+
+ int grades_count = stoi(ltrim(rtrim(grades_count_temp)));
+
+ vector<int> grades(grades_count);
+
+ for (int i = 0; i < grades_count; i++) {
+ string grades_item_temp;
+ getline(cin, grades_item_temp);
+
+ int grades_item = stoi(ltrim(rtrim(grades_item_temp)));
+
+ grades[i] = grades_item;
+ }
+
+ vector<int> result = gradingStudents(grades);
+
+ for (int i = 0; i < result.size(); i++) {
+ fout << result[i];
+
+ if (i != result.size() - 1) {
+ fout << "\n";
+ }
+ }
+
+ fout << "\n";
+
+ fout.close();
+
+ return 0;
+}
+
+string ltrim(const string &str) {
+ string s(str);
+
+ s.erase(
+ s.begin(),
+ find_if(s.begin(), s.end(), not1(ptr_fun<int, int>(isspace)))
+ );
+
+ return s;
+}
+
+string rtrim(const string &str) {
+ string s(str);
+
+ s.erase(
+ find_if(s.rbegin(), s.rend(), not1(ptr_fun<int, int>(isspace))).base(),
+ s.end()
+ );
+
+ return s;
+}