Compilare: user.cpp: In function ‘void solve()’: user.cpp:99:12: warning: unused variable ‘j’ [-Wunused-variable] int i, j, h; ^ user.cpp:99:15: warning: unused variable ‘h’ [-Wunused-variable] int i, j, h; ^ user.cpp:100:9: warning: variable ‘ok’ set but not used [-Wunused-but-set-variable] int ok = 0; ^ user.cpp: In function ‘void readFile()’: user.cpp:25:24: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d", &n); ^