Compilare: main.cpp: In function 'void construct()': main.cpp:34:18: warning: unused variable 'ch' [-Wunused-variable] 34 | char ch = s[dr]; | ^~ main.cpp: In function 'int main()': main.cpp:77:18: warning: unused variable 'ch' [-Wunused-variable] 77 | char ch = s[i]; | ^~ main.cpp:73:14: warning: unused variable 'ch' [-Wunused-variable] 73 | char ch = s[i]; | ^~ main.cpp:68:9: warning: unused variable 'n' [-Wunused-variable] 68 | int n = str.size(); | ^