Compilare: user.cpp: In function ‘int main()’: user.cpp:32:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < l[0].size(); i++) ^ user.cpp: In function ‘int func(int, int)’: user.cpp:46:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < l[dest].size(); i++) ^ user.cpp: In function ‘int main()’: user.cpp:16:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("hamilton.in", "r", stdin); ^ user.cpp:17:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("hamilton.out", "w", stdout); ^ user.cpp:19:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &m); ^ user.cpp:27:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d", &x, &y, &z); ^