Compilare: main.cpp: In function 'int main()': main.cpp:34:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<dq.size()-1;i++){ ~^~~~~~~~~~~~ main.cpp:13:22: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d",&n); ^ main.cpp:17:27: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d",&a[i]); ^