Compilare: user.cpp: In function ‘void solve()’: user.cpp:28:12: warning: unused variable ‘j’ [-Wunused-variable] int i, j; ^ user.cpp:103:9: warning: variable ‘first’ set but not used [-Wunused-but-set-variable] int first = 0; ^ user.cpp: In function ‘void readFile()’: user.cpp:15:30: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d%d", &n, &k); ^