Compilare: user.cpp: In function ‘void Solve(int)’: user.cpp:98:34: warning: unused variable ‘from’ [-Wunused-variable] int sum = 0, finish = start, from = n + 1, to = n + 1, taken = 0; ^ user.cpp:98:48: warning: unused variable ‘to’ [-Wunused-variable] int sum = 0, finish = start, from = n + 1, to = n + 1, taken = 0; ^ user.cpp: In function ‘bool Check(long long int)’: user.cpp:158:21: warning: unused variable ‘p’ [-Wunused-variable] for (int i = 2, p = 1; i <= n; i++) { ^ user.cpp: In function ‘char Advance()’: user.cpp:20:38: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buffer, 1, SIZE, stdin); ^ user.cpp: In function ‘int main()’: user.cpp:212:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("oneouts.in", "r", stdin); ^ user.cpp:213:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("oneouts.out", "w", stdout); ^