Compilare: user.cpp: In function ‘int solve(int, int, int, int, int, int)’: user.cpp:29:29: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] if (xx<=0||yy<=0&&xx>n||yy>n) ^ user.cpp: In function ‘int main()’: user.cpp:46:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("vis.in","r",stdin); ^ user.cpp:47:34: 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 function ‘void get(int&)’: user.cpp:72:51: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread (buffer, NMAX, 1, stdin), bufpoz = 0; ^ user.cpp:80:55: 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, NMAX, stdin), bufpoz = 0; ^ user.cpp:87:55: 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, NMAX, stdin), bufpoz = 0; ^