Compilare: user.cpp: In function ‘void solve()’: user.cpp:53:17: warning: array subscript has type ‘char’ [-Wchar-subscripts] frec[c[i]]++; ^ user.cpp:71:28: warning: array subscript has type ‘char’ [-Wchar-subscripts] left=max(0,i-p[c[i]]); ^ user.cpp:8:25: note: in definition of macro ‘max’ #define max(a,b) ( (a)>(b)?(a):(b)) ^ user.cpp:71:28: warning: array subscript has type ‘char’ [-Wchar-subscripts] left=max(0,i-p[c[i]]); ^ user.cpp:8:33: note: in definition of macro ‘max’ #define max(a,b) ( (a)>(b)?(a):(b)) ^ user.cpp:72:31: warning: array subscript has type ‘char’ [-Wchar-subscripts] right=min(n-1,i+p[c[i]]); ^ user.cpp:9:25: note: in definition of macro ‘min’ #define min(a,b) ( (a)<(b)?(a):(b)) ^ user.cpp:72:31: warning: array subscript has type ‘char’ [-Wchar-subscripts] right=min(n-1,i+p[c[i]]); ^ user.cpp:9:33: note: in definition of macro ‘min’ #define min(a,b) ( (a)<(b)?(a):(b)) ^ user.cpp:80:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i(1); i <=dist.size()-1; ++i ) ^