recursion

combination/Source.cpp

@@ -11,6 +11,21 @@ namespace ask {
 
 		return number;
 	}
+
+	void combination(int* array, int size, int i, int j) {
+
+		if (i >= size) {
+			return;
+		}
+
+		if (j >= size) {
+			combination(array, size, i + 1, i + 2);
+			return;
+		}
+
+		std::cout << array[i] << " , " << array[j] << std::endl;
+		combination(array, size, i, j + 1);
+	}
 }
 
 int main() {
@@ -23,16 +38,8 @@ int main() {
 		array[i] = i + 1;
 	}
 
-	for (int i = 0; i < size; i++) {
-
-		for (int j = 1; j < size; j++) {
-
-			if (array[j] > array[i]) {
-
-				std::cout << array[i] << " , " << array[j] << std::endl;
-			}
-		}
-	}
+	ask::combination(array, size, 0, 1);
+
 	delete[] array;
 	return EXIT_SUCCESS;
 }