Compilare: user.cpp: In function ‘void solve_last_three()’: user.cpp:132:9: warning: unused variable ‘i’ [-Wunused-variable] int i, j; ^ user.cpp: In function ‘int main()’: user.cpp:140:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("pavare3.in","r",stdin); ^ user.cpp:141:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("pavare3.out","w",stdout); ^ user.cpp:143:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &m); ^