Compilare: user.cpp: In function ‘int main()’: user.cpp:29:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=1; i < V.size(); ++i) ^ user.cpp:112:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=1; i< V.size(); ++i) ^ user.cpp:129:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=1; i < V.size(); ++i) ^ user.cpp:175:58: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (V[dr] == V[where] and dr < V.size()) ^ user.cpp:177:44: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (dr == (V.size() - 1)) ^ user.cpp:186:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (dr == V.size() - 1) ^ user.cpp:204:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<V.size(); ++i) ^ user.cpp:8:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("arc.in","r",stdin); ^ user.cpp:9:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("arc.out","w",stdout); ^ user.cpp:14:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&K,&N); ^ user.cpp:19:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&x); ^