Compilare: user.cpp: In function ‘int main()’: user.cpp:15:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<s.size();i++) ^ user.cpp:10:9: warning: unused variable ‘n’ [-Wunused-variable] int n; ^ user.cpp:11:36: warning: variable ‘lmax’ set but not used [-Wunused-but-set-variable] int maxx=-1,minn=10000000,lmin,lmax,maxx1=-1,minn1=10000000; ^ user.cpp:74:21: warning: ‘op’ may be used uninitialized in this function [-Wmaybe-uninitialized] v[op]++; ^