Compilare: user.cpp: In function ‘int cmmmc(int, int)’: user.cpp:6:9: warning: unused variable ‘c’ [-Wunused-variable] int r,c,x,y; ^ user.cpp: In function ‘int main()’: user.cpp:24:24: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d",&n); ^ user.cpp:27:31: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d",&v[i]); ^