Problem	missingnumber
User	JT853
Submission Time	2026-07-13 21:17:37
Score	0
Max Time	N/A
Max Memory	N/A

Compile Error

missingnumber.cpp: In function ‘int main()’:
missingnumber.cpp:15:24: error: ‘sum’ cannot be used as a function
15 | cout << (sum (sum+1))/2;
| ^