Compilare: user.cpp: In function ‘void read()’: user.cpp:14:13: warning: unused variable ‘c’ [-Wunused-variable] int x,y,c; ^ user.cpp: In function ‘int main()’: user.cpp:61:9: warning: unused variable ‘p’ [-Wunused-variable] { int p; ^ user.cpp: In function ‘void read()’: user.cpp:15:34: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d %d %d",&n,&m,&s); ^ user.cpp:18:32: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d %d",&x,&y); ^