Compilare: user.cpp: In function ‘int main()’: user.cpp:22:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;((i<strlen(a))&&(W>0));i++) ^ user.cpp:9:23: warning: unused variable ‘l’ [-Wunused-variable] long long v[30],W,l; ^ user.cpp:10:21: warning: unused variable ‘p’ [-Wunused-variable] char a[1000000],p; ^