Compilare: user.cpp: In function ‘int main()’: user.cpp:47:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(ii<strlen(a[i])&&jj<strlen(a[j])) ^ user.cpp:47:58: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(ii<strlen(a[i])&&jj<strlen(a[j])) ^ user.cpp:53:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(ii==strlen(a[i])) ^ user.cpp:12:30: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d %d\n",&p,&n); ^ user.cpp:18:28: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets(s,5002,f); ^ user.cpp:38:31: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets(a[i],5002,f); ^