Compilare: main.cpp: In function 'void process(std::vector<int>)': main.cpp:12:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<w.size();i++) ~^~~~~~~~~ main.cpp:16:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<w.size();i+=2) ~^~~~~~~~~ main.cpp:20:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=1;i<w.size();i+=2) ~^~~~~~~~~ main.cpp: In function 'int main()': main.cpp:28:25: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d",&n); ^