Compilare: user.cpp: In function ‘int main()’: user.cpp:61:25: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d", &N); ^ user.cpp:64:39: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d", &h[i][j]); ^ user.cpp:89:18: warning: ‘col’ may be used uninitialized in this function [-Wmaybe-uninitialized] DRUM(lin,col); ^ user.cpp:89:18: warning: ‘lin’ may be used uninitialized in this function [-Wmaybe-uninitialized]