Read the question, write TypeScript on the right, then Run or Check.
QuestionHint and solution stay closed until you open them
Print 1+…+n.
Examples
Input
5
Output
15
Hint
- n*(n+1)/2
Show correct code
Peek only after you have tried. You can still Check your own version.
const n: number = Number(readLine());
console.log((n * (n + 1)) / 2);
main.tstsc · readLine() · Ctrl + Enter
ResultIdle
Run to see output. Check grades the tests.