Compilare: main.cpp: In function 'void do1()': main.cpp:47:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( i = 0 ; i < S.size() ; i ++ ) ~~^~~~~~~~~~ main.cpp:34:10: warning: unused variable 'd1' [-Wunused-variable] int i , d1 , d2 , x , y ; ^~ main.cpp:34:15: warning: unused variable 'd2' [-Wunused-variable] int i , d1 , d2 , x , y ; ^~ main.cpp:34:20: warning: unused variable 'x' [-Wunused-variable] int i , d1 , d2 , x , y ; ^ main.cpp:34:24: warning: unused variable 'y' [-Wunused-variable] int i , d1 , d2 , x , y ; ^