0_0_38875176_31873.cpp: In function 'int main()': 0_0_38875176_31873.cpp:5:14: error: redeclaration of 'int n' 5 | register int n; | ^ 0_0_38875176_31873.cpp:4:13: note: 'int n' previously declared here 4 | int n; bool flag = false; | ^