समस्या
अनुवाद दिखाएँEvery person shakes hands once with every other person. A handshake between A and B is the same event as one between B and A. Nobody shakes their own hand.
Implement handshake_count(people).
Input
people: The number of people.
Output
Return the total number of distinct handshakes.
सीमाएँ
0 ≤ people ≤ 1,000,000,000. The answer fits a signed 64-bit integer.
उदाहरण
उदाहरण 1
इनपुट:
people = 4
अपेक्षित आउटपुट:
expected = 6इनपुट:
long long people = 4;
अपेक्षित आउटपुट:
long long expected = 6;इनपुट:
long people = 4;
अपेक्षित आउटपुट:
long expected = 6;व्याख्या
The pairs are AB, AC, AD, BC, BD, and CD: six handshakes.
उदाहरण 2
इनपुट:
people = 1
अपेक्षित आउटपुट:
expected = 0इनपुट:
long long people = 1;
अपेक्षित आउटपुट:
long long expected = 0;इनपुट:
long people = 1;
अपेक्षित आउटपुट:
long expected = 0;व्याख्या
One person has nobody else to greet.
संदर्भ
यह चुनौती CodeUtility के लिए अनुकूलित की गई है। ऊपर दिए गए स्टेटमेंट और सीमाओं का पालन करें।