Compilare: user.cpp: In function ‘void solve()’: user.cpp:109:13: warning: unused variable ‘k’ [-Wunused-variable] int k = i , sum = 0 , in = 0; ^ user.cpp: In function ‘int main()’: user.cpp:126:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cumpanit.in" ,"r", stdin); ^ user.cpp:128:31: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lld %lld", &a, &b); ^