Compilare: main.cpp: In function 'int main()': main.cpp:45:12: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i<tree.size()) ~^~~~~~~~~~~~ main.cpp:47:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<tree[i]->next.size();j++) ~^~~~~~~~~~~~~~~~~~~~~ main.cpp:30:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("maimute.in","r",stdin); ^ main.cpp:31:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("maimute.out","w",stdout); ^