Main.cpp: In function 'int main()':
Main.cpp:16:19: warning: ISO C++17 does not allow 'register' storage class specifier [-Wregister]
16 | for(register int i = 1; i <= n; ++i){
| ^
Main.cpp:20:19: warning: ISO C++17 does not allow 'register' storage class specifier [-Wregister]
20 | for(register int i = 1; i <= n; ++i){
| ^
Main.cpp:26:19: warning: ISO C++17 does not allow 'register' storage class specifier [-Wregister]
26 | for(register int i = n; i >= 1; --i){
| ^
Main.cpp:32:19: warning: ISO C++17 does not allow 'register' storage class specifier [-Wregister]
32 | for(register int i = 1; i <= n; ++i){
| ^