local

Author: mostafa-saad

18-Programming-4kids/08_homework_01_answer.cpp

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+/*
+ */
+
+#include<iostream>
+using namespace std;
+
+int main() {
+	int start, end;
+
+	cin>>start>>end;
+
+	while(start <= end)
+	{
+		cout<<start<<"\n";
+		start++;
+	}
+
+	return 0;
+}
+

18-Programming-4kids/08_homework_02_answer.cpp

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+/*
+ */
+
+#include<iostream>
+using namespace std;
+
+int main() {
+	int num;
+	char ch;
+
+	cin>>num>>ch;
+
+	while(num > 0)
+	{
+		cout<<ch;
+		num -= 1;
+	}
+
+	return 0;
+}
+

18-Programming-4kids/08_homework_03_answer.cpp

@@ -0,0 +1,27 @@
+/*
+ * 
+ */
+
+#include<iostream>
+using namespace std;
+
+int main() {
+	int N;
+
+	cin >> N;
+
+	int row = 1;
+	while (row <= N) {
+		int stars_count = 1;
+
+		while (stars_count <= row) {
+			cout << '*';
+			++stars_count;
+		}
+		cout << "\n";
+		row++;
+	}
+
+	return 0;
+}
+

18-Programming-4kids/08_homework_04_answer.cpp

@@ -0,0 +1,26 @@
+/*
+ */
+
+#include<iostream>
+using namespace std;
+
+int main() {
+	int N;
+
+	cin >> N;
+
+	int row = N;
+	while (row > 0) {
+		int stars_count = 1;
+
+		while (stars_count <= row) {
+			cout << '*';
+			++stars_count;
+		}
+		cout << "\n";
+		row--;
+	}
+
+	return 0;
+}
+

18-Programming-4kids/08_homework_05_answer.cpp

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+/*
+ * Homework 5: Print diamond
+ *
+ * Given a number N. Print diamond of 2N rows as in.
+ * 	https://codeforces.com/group/MWSDmqGsZm/contest/219432/problem/X
+ */
+
+#include<iostream>
+using namespace std;
+
+int main() {
+	int N;
+
+	cin >> N;
+
+	/*
+	 * Let's print the upper triangle first
+	 * Let's assume N = 4, how many spaces and starts we print
+	 * Row 1	Spaces 3	Stars 1
+	 * Row 2	Spaces 2	Stars 3
+	 * Row 3	Spaces 1	Stars 5
+	 * Row 4	Spaces 0	Stars 7
+	 *
+	 * Now we wanna develop formulas for number of spaces and number of starts
+	 * For a given 'row'
+	 * 	Spaces are: N - rows   	(3, 2, 1, 0)
+	 * 	Starts are: 2*row -1	(1, 3, 5, 7)
+	 *
+	 * Now we just iterate for each row
+	 * 	print spaces
+	 * 	then print starts
+	 */
+	int row = 1;
+	while (row <= N) {
+		int stars_count = 1;
+
+		// Print N - rows spaces
+		while (stars_count <= N-row) {
+			cout << ' ';
+			++stars_count;
+		}
+
+		// Print 2*rows-1 stars
+		stars_count = 1;
+		while (stars_count <= 2*row-1) {
+			cout << '*';
+			++stars_count;
+		}
+		cout << "\n";
+		++row;
+	}
+
+	/*
+	 * Let's print the lower triangle second
+	 * Same logic, we just switch looping from N to 1
+	 */
+	row = N;
+	while (row >= 1) {
+		int stars_count = 1;
+
+		while (stars_count <= N-row) {
+			cout << ' ';
+			++stars_count;
+		}
+
+		stars_count = 1;
+
+		while (stars_count <= 2*row-1) {
+			cout << '*';
+			++stars_count;
+		}
+		cout << "\n";
+		--row;
+	}
+	return 0;
+}
+

18-Programming-4kids/08_homework_06_answer.cpp

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+
+
+/*
+ *
+ * Test cases
+ * Input: 7 11 101 21 201 31 602 78
+ *
+ * Output: 35.25 301.333
+ */
+
+#include<iostream>
+using namespace std;
+
+int main() {
+	int N;
+
+	cin >> N;
+
+	// Use doubles to: 1) allow any values 2) get average correctly
+	double even_sum = 0, odd_sum = 0;
+	int even_count = 0, odd_count = 0;
+
+	int cnt = 1;
+	while (cnt <= N) {
+		double value;
+		cin >> value;
+
+		if (cnt % 2 == 0)	// even position
+			even_sum += value, even_count++;
+		else				// odd position
+			odd_sum += value, odd_count++;
+
+		cnt++;
+	}
+
+	cout <<odd_sum / odd_count << " " << even_sum / even_count << "\n";
+
+	return 0;
+}
+

18-Programming-4kids/08_homework_07_answer.cpp

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+#include<iostream>
+using namespace std;
+
+int main() {
+	int N, result = 0;
+
+	cin >> N;
+
+	int cnt = 0;
+
+	while (cnt <= N)
+	{
+		if (cnt % 8 == 0 || cnt % 3 == 0 && cnt % 4 == 0)
+			cout<<cnt<<" ";
+
+		cnt ++;
+	}
+
+
+
+
+	return 0;
+}
+

18-Programming-4kids/08_homework_08_answer.cpp

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+#include<iostream>
+using namespace std;
+
+int main() {
+	int N, result = 0;
+
+	cin >> N;
+
+	int cnt = 0;
+	int current_number = 0;
+
+	while (cnt <= N) {
+		if (current_number % 3 == 0 && current_number % 4 != 0) {
+			cout << current_number << " ";
+			cnt++;
+		}
+		current_number++;
+	}
+	return 0;
+}
+

18-Programming-4kids/08_homework_09_answer.cpp

@@ -0,0 +1,24 @@
+#include<iostream>
+using namespace std;
+
+int main() {
+	int N;
+
+	cin >> N;
+
+	int pos = 0;
+
+	while (pos < N) {
+		string str;
+		cin>>str;
+
+		// there are 8 different ways to make 2 letters no in lower/upper cases
+		if (str == "no" || str == "No" || str == "nO" || str == "NO" ||
+			str == "on" || str == "oN" || str == "On" || str == "ON")
+			cout<<str<<" ";
+
+		pos++;
+	}
+	return 0;
+}
+

18-Programming-4kids/08_homework_10_answer.cpp

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+#include<iostream>
+using namespace std;
+
+int main() {
+	int N;
+
+	cin >> N;
+
+	int number = 0;
+
+	while (N > 0) {
+		int last_digits = N % 10;
+		N /= 10;	// remove last digit
+
+		number = number * 10 + last_digits;
+	}
+	cout << number << " " << number * 3 << "\n";
+
+	return 0;
+}
+