Compilare: user.cpp: In function ‘void dfs(int, int)’: user.cpp:70:42: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] if ((dp[0][it] || dp[1][it]) && x + y == sz[it] || dp[2][it]) ^ user.cpp: In constructor ‘InputReader::InputReader(const char*)’: user.cpp:14:38: 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, input); ^ user.cpp: In member function ‘void InputReader::advance()’: user.cpp:42:42: 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, input); ^