Compilare: user.cpp: In function ‘void find_n()’: user.cpp:22:13: warning: array subscript has type ‘char’ [-Wchar-subscripts] ++r[v[0]], ++nr; ^ user.cpp:29:25: warning: array subscript has type ‘char’ [-Wchar-subscripts] if ( !r[v[j]] ) ^ user.cpp:30:25: warning: array subscript has type ‘char’ [-Wchar-subscripts] ++r[v[j]], ++nr; ^ user.cpp:31:26: warning: array subscript has type ‘char’ [-Wchar-subscripts] else ++r[v[j]]; ^ user.cpp:37:21: warning: array subscript has type ‘char’ [-Wchar-subscripts] --r[v[i]]; ^ user.cpp:38:25: warning: array subscript has type ‘char’ [-Wchar-subscripts] if ( !r[v[i]] ) ^ user.cpp: In function ‘void read()’: user.cpp:12:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ( "teatru.in", "r", stdin ); ^ user.cpp:13:38: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ( "%d%d%c", &n, &c, &v[0] ); ^ user.cpp:15:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ( "%c", &v[i] ); ^ user.cpp: In function ‘void write()’: user.cpp:47:42: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ( "teatru.out", "w", stdout ); ^