Compilare: user.cpp: In function ‘void lee()’: user.cpp:10:13: warning: unused variable ‘x2’ [-Wunused-variable] int x,y,x2,y2,ok; ^ user.cpp:10:16: warning: unused variable ‘y2’ [-Wunused-variable] int x,y,x2,y2,ok; ^ user.cpp: In function ‘int main()’: user.cpp:69:27: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d%d",&n,&m); ^ user.cpp:72:34: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&v[i][j]); ^