Compilare: main.cpp: In function 'void dfs(trie*)': main.cpp:40:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0 ; i < nod->v.size() ; i++){ ~~^~~~~~~~~~~~~~~ main.cpp:42:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j = 0 ; j < nod->v[i]->w.size() ; j++){ ~~^~~~~~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:108:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j = 0 ; j < pos[i]->w.size() ; j++){ ~~^~~~~~~~~~~~~~~~~~ main.cpp:57:32: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d%d\n",&n,&k); ^ main.cpp:58:37: warning: ignoring return value of 'char* fgets(char*, int, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fgets (initial+1 , n + 10 , fin); ^ main.cpp:62:38: warning: ignoring return value of 'char* fgets(char*, int, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fgets (s[i]+1 , 100010 , fin); ^