Compilare: user.cpp: In function ‘void bak2(int, int)’: user.cpp:43:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (k = 0; k < s[x].size(); k++) ^ user.cpp: In function ‘void bak1(int, int)’: user.cpp:63:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (k = 0; k < s[x].size(); k++) ^ user.cpp: In function ‘int main()’: user.cpp:76:8: warning: unused variable ‘b’ [-Wunused-variable] int a,b,x,y,contor=0; ^ user.cpp:76:14: warning: unused variable ‘contor’ [-Wunused-variable] int a,b,x,y,contor=0; ^