Compilare: user.cpp: In constructor ‘Trie::Trie()’: user.cpp:16:36: warning: passing NULL to non-pointer argument 2 of ‘void* memset(void*, int, size_t)’ [-Wconversion-null] memset(fiu,NULL,sizeof(fiu)); ^ user.cpp: In function ‘void dfs(Trie*)’: user.cpp:54:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0;T -> dp.size() <= K && j < (int)T -> fiu[i] -> dp.size();j++){ ~~~~~~~~~~~~~~~^~~~ user.cpp:58:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int k = 0;k < T -> fiu[i] -> dp.size() && j + k <= K;k++){ ~~^~~~~~~~~~~~~~~~~~~~~~~~~~ user.cpp:65:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(T -> dp.size() <= K)T -> dp.push_back(1 << 28); ~~~~~~~~~~~~~~~^~~~ user.cpp: In function ‘int main()’: user.cpp:73:30: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d %d\n",&N,&K); ^ user.cpp:75:31: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets(C + 1,1000005,f); ^