Compilare: user.cpp: In function ‘void solve2()’: user.cpp:72:8: warning: unused variable ‘i’ [-Wunused-variable] int i,j; ^ user.cpp:72:10: warning: unused variable ‘j’ [-Wunused-variable] int i,j; ^ user.cpp: In function ‘void read()’: user.cpp:11:32: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d%d%d",&p1,&N,&k); ^ user.cpp:15:25: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d",&a[i]); ^