Compilare: user.cpp: In function ‘int main()’: user.cpp:50:43: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if ( in( t.x + dx[i], n ) && in( t.y + dy[i], n ) ) ^ user.cpp:20:39: note: in definition of macro ‘in’ # define in( x, a ) ( unsigned( x ) < a ) ^ user.cpp:50:67: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if ( in( t.x + dx[i], n ) && in( t.y + dy[i], n ) ) ^ user.cpp:20:39: note: in definition of macro ‘in’ # define in( x, a ) ( unsigned( x ) < a ) ^ user.cpp:76:43: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if ( in( t.x + dx[i], n ) && in( t.y + dy[i], n ) ) ^ user.cpp:20:39: note: in definition of macro ‘in’ # define in( x, a ) ( unsigned( x ) < a ) ^ user.cpp:76:67: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if ( in( t.x + dx[i], n ) && in( t.y + dy[i], n ) ) ^ user.cpp:20:39: note: in definition of macro ‘in’ # define in( x, a ) ( unsigned( x ) < a ) ^ user.cpp:26:28: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf( fin, "%d", &p ); ^ user.cpp:30:38: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf( fin, "%d%d", &n, &g ); ^ user.cpp:35:41: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf( fin, "%d", &nr ); ^ user.cpp:58:32: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf( fin, "%d", &n ); ^ user.cpp:62:48: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf( fin, "%d", &mat[i][j] ); ^