Compilare: user.cpp: In member function ‘bool Graph::PairUp(int)’: user.cpp:55:21: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] if (a[x][y] && Pair[y] == -1 || PairUp(Pair[y])) ~~~~~~~~^~~~~~~~~~~~~~~~ user.cpp: In member function ‘int Graph::Match()’: user.cpp:68:30: warning: argument to ‘sizeof’ in ‘void* memset(void*, int, size_t)’ call is the same expression as the destination; did you mean to dereference it? [-Wsizeof-pointer-memaccess] memset(vis, 0, sizeof(vis)); ^ user.cpp: In function ‘int main()’: user.cpp:77:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &m); ^ user.cpp:85:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &u, &v); ^