Compilare: user.cpp: In function ‘void df(int)’: user.cpp:45:13: warning: unused variable ‘ki’ [-Wunused-variable] int x,y,ki,j; ^ user.cpp:45:16: warning: unused variable ‘j’ [-Wunused-variable] int x,y,ki,j; ^ user.cpp: In function ‘void df2(int)’: user.cpp:78:13: warning: unused variable ‘ki’ [-Wunused-variable] int x,y,ki,j; ^ user.cpp:78:16: warning: unused variable ‘j’ [-Wunused-variable] int x,y,ki,j; ^ user.cpp: In function ‘int main()’: user.cpp:111:6: warning: unused variable ‘sum’ [-Wunused-variable] {int sum=0,k=0; ^ user.cpp:111:12: warning: unused variable ‘k’ [-Wunused-variable] {int sum=0,k=0; ^ user.cpp:112:27: 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:114:31: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d%d",&x,&y); ^