Compilare: user.cpp: In function ‘int main()’: user.cpp:17:9: warning: unused variable ‘lin’ [-Wunused-variable] int lin=1,col=1; ^ user.cpp:17:15: warning: unused variable ‘col’ [-Wunused-variable] int lin=1,col=1; ^ user.cpp:15:44: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d%d%d%d%d",&N,&M,&P,&Q,&S); ^