Compilare: user.cpp: In function ‘void advance_pointer(int&, int&)’: user.cpp:29:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(p!=points.size()-1 && points[p].x == points[p+1].x && points[p+1].y-points[p].y<2); ^ user.cpp: In function ‘bool dfs(int)’: user.cpp:42:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<graph[temp].size(); i++) ^ user.cpp: In function ‘int main()’: user.cpp:86:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(p2<points.size() && points[p2].x==points[p2-1].x) ^ user.cpp:91:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(p1!=points.size() && p2!=points.size()) ^ user.cpp:91:46: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(p1!=points.size() && p2!=points.size()) ^ user.cpp:57:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("tradare.in", "r", stdin); ^ user.cpp:58:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("tradare.out", "w", stdout); ^ user.cpp:60:17: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &T); ^ user.cpp:64:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d", &n, &m, &k); ^ user.cpp:68:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &x, &y); ^