Compilare: user.cpp: In function ‘int valid(int*)’: user.cpp:79:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(Sol.size() != n - 1) ^ user.cpp: In function ‘int main()’: user.cpp:101:45: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("permsplitcount.in", "r", stdin); ^ user.cpp:102:47: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("permsplitcount.out", "w", stdout); ^ user.cpp:103:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d\n", &n, &k); ^