Compilare: user.cpp: In function ‘int main()’: user.cpp:50:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<x[h].size();i++){ ^ user.cpp:21:24: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d\n",&n); ^ user.cpp:23:24: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets(s,6500,f); ^