Compilare: user.cpp: In function ‘int main()’: user.cpp:21:57: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(j && s[j]>v.back() && v.size()+n-i-1>=m && !v.empty()) ^ user.cpp:12:13: warning: unused variable ‘x’ [-Wunused-variable] int n,m,x=0,i,y=0,z=0,j; ^ user.cpp:12:19: warning: unused variable ‘y’ [-Wunused-variable] int n,m,x=0,i,y=0,z=0,j; ^ user.cpp:12:23: warning: unused variable ‘z’ [-Wunused-variable] int n,m,x=0,i,y=0,z=0,j; ^