Compilare: user.cpp: In function ‘bool Check(int)’: user.cpp:48:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=1; i<P.size(); i++) ^ user.cpp: In function ‘int Binary_Search()’: user.cpp:63:14: warning: variable ‘ans’ set but not used [-Wunused-but-set-variable] int mid, ans=0; ^ user.cpp:75:12: warning: ‘mid’ may be used uninitialized in this function [-Wmaybe-uninitialized] return mid; ^