Compilare: user.cpp: In function ‘int main()’: user.cpp:23:14: warning: array subscript has type ‘char’ [-Wchar-subscripts] A[ x ][ y ] = A[ y ][ x ] = 1; ^ user.cpp:23:19: warning: array subscript has type ‘char’ [-Wchar-subscripts] A[ x ][ y ] = A[ y ][ x ] = 1; ^ user.cpp:23:28: warning: array subscript has type ‘char’ [-Wchar-subscripts] A[ x ][ y ] = A[ y ][ x ] = 1; ^ user.cpp:23:33: warning: array subscript has type ‘char’ [-Wchar-subscripts] A[ x ][ y ] = A[ y ][ x ] = 1; ^ user.cpp:15:21: warning: unused variable ‘k’ [-Wunused-variable] int n, m, i, j, k; ^ user.cpp:12:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("nrcuv.in","r",stdin); ^ user.cpp:13:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("nrcuv.out","w",stdout); ^ user.cpp:18:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf( "%d%d%*c",&n,&m ); ^ user.cpp:20:36: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf( "%c%*c%c%*c",&x,&y ); ^