Compilare: user.cpp: In function ‘char Advance()’: user.cpp:27:38: 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:59:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("tradare.in", "r", stdin); ^ user.cpp:60:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("tradare.out", "w", stdout); ^ user.cpp:55:16: warning: ‘l’ may be used uninitialized in this function [-Wmaybe-uninitialized] return 1LL * x * m + y; ^ user.cpp:78:32: note: ‘l’ was declared here int cells = 0, l, c; ^ user.cpp:55:24: warning: ‘c’ may be used uninitialized in this function [-Wmaybe-uninitialized] return 1LL * x * m + y; ^ user.cpp:78:35: note: ‘c’ was declared here int cells = 0, l, c; ^