accepted

Author: AnneLivia

Online Judges/Neps Academy/TriangulosOBI2011.cpp

@@ -0,0 +1,31 @@
+#include <iostream>
+#include <cmath>
+
+using namespace std;
+
+int main() {
+    int a, b, c;
+    cin >> a >> b >> c;
+    
+    if ((b + c) > a && (a + c) > b && (b + a) > c) {
+        float angleA = acos((b * b + c * c - a * a) / ( 2.0 * b * c));
+        float angleB = acos((a * a + c * c - b * b) / ( 2.0 * a * c));
+        float angleC = acos((a * a + b * b - c * c) / ( 2.0 * b * a));
+
+        // converting to degree
+        angleA = (int)(angleA * 180 / 3.1415);
+        angleB = (int)(angleB * 180 / 3.1415);
+        angleC = (int)(angleC * 180 / 3.1415);
+
+        if (angleA == 90 || angleB == 90 || angleC == 90) {
+            cout << "r\n";
+        } else if (angleA < 90 && angleB < 90 && angleC < 90) {
+            cout << "a\n";
+        } else {
+            cout << "o\n";
+        }
+    } else {
+        cout << "n\n";
+    } 
+    return 0;  
+}