Compilare: user.cpp: In function ‘int DP(int, int)’: user.cpp:25:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<h[node].size();i++){ ^ user.cpp: In function ‘int main()’: user.cpp:47:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i1=0;i1<h[0].size();i1++) ^ user.cpp:38:37: 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:39:39: 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:40:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&m); ^ user.cpp:42:34: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%dm",&x,&y,&z); ^