Compilare: user.cpp: In function ‘void Analyze(int)’: user.cpp:14:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<a[lin].size();i++) ^ user.cpp: In function ‘void Read()’: user.cpp:19:9: warning: unused variable ‘x’ [-Wunused-variable] { int i,x; ^ user.cpp: In function ‘void Check()’: user.cpp:29:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<a[lin].size();j++) ^ user.cpp:25:15: warning: variable ‘ok’ set but not used [-Wunused-but-set-variable] { int i,lin,j,ok=0; ^