fri may 7

hackerrank.cats.and.a.mouse.cpp

@@ -0,0 +1,7 @@
+string catAndMouse(int x, int y, int z) {
+	if (abs(x-z) > abs(y-z))
+		return "Cat B";
+	else if (abs(x-z) < abs(y-z))
+		return "Cat A";
+	else return "Mouse C";
+}

hackerrank.drawing.book.cpp

@@ -0,0 +1,21 @@
+#include <bits/stdc++.h>
+
+using namespace std;
+
+int pageCount(int n, int p) {
+	if (p == 1 || p == n) return 0;
+
+	if (n % 2 == 0 && p == n-1) return 1;
+	else if (n % 2 != 0 && p == n-1) return 0;
+	
+	// ascending order first
+	int ascending = p / 2;
+	// descending order
+	int descending = std::ceil((double)(n-p) / 2);
+	return (ascending < descending)? ascending : descending;
+}
+
+int main() {
+	cout << pageCount(6, 5);
+	return 0;
+}

hackerrank.electronics.shop.cpp

@@ -0,0 +1 @@
+hello

hackerrank.forming.a.magic.square.cpp

@@ -0,0 +1,39 @@
+int mat_diff(vector<vector<int>> s, vector<vector<int>> m) {
+	int diff = 0;
+	for (int i = 0; i < 3; i++)
+		for (int j = 0; j < 3; j++) {
+			diff += abs(s[i][j] - m[i][j]);
+		}
+	return diff;
+}
+
+int formingMagicSquare(vector<vector<int>> s) {
+	vector<vector<int>> magic_sqr_1 = {
+		{2, 7, 6},
+		{9, 5, 1},
+		{4, 3, 8}
+	};
+	vector<vector<int>> magic_sqr_2 = {
+		{6, 1, 8},
+		{7, 5, 3},
+		{2, 9, 4}
+	};
+	vector<vector<int>> magic_sqr_3 = {
+		{8, 3, 4},
+		{1, 5, 9},
+		{6, 7, 2}
+	};
+	vector<vector<int>> magic_sqr_4 = {
+		{4, 9, 2},
+		{3, 5, 7},
+		{8, 1, 6}
+	};
+
+	vector<int> diffs = {
+		mat_diff(s, magic_sqr_1),
+		mat_diff(s, magic_sqr_2),
+		mat_diff(s, magic_sqr_3),
+		mat_diff(s, magic_sqr_4)};
+
+	return diffs[distance(diffs.begin(), std::min_element(diffs.begin(), diffs.end());
+}