Compilare: user.cpp: In function ‘int solve(int, int, int, int, int, int)’: user.cpp:100:29: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] if (xx<=0||yy<=0&&xx>n||yy>n) ^ user.cpp: In function ‘int main()’: user.cpp:117:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("vis.out","w",stdout); ^ user.cpp: In member function ‘char InParser::read_ch()’: 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(buff, 1, 4096, fin); ^