Compilare: main.cpp: In function 'void join(int, int)': main.cpp:25:16: warning: left operand of comma operator has no effect [-Wunused-value] 25 | switch(a,b); /// s[a]<s[b] | ^ main.cpp: In function 'int main()': main.cpp:47:9: warning: unused variable 'x' [-Wunused-variable] 47 | int x,y; | ^ main.cpp:47:11: warning: unused variable 'y' [-Wunused-variable] 47 | int x,y; | ^