Compilare: user.cpp: In function ‘int poly(std::vector<int>, std::deque<int>&)’: user.cpp:28:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1 ; i < X.size() - 1 ; i++ ) { ^ user.cpp:37:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0 ; i < Z.size() - 2 ; i++ ) { ^ user.cpp: In function ‘int main()’: user.cpp:90:46: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(k=0;k<X.size();k++) { ^ user.cpp:98:47: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (k=0;k<X.size();k++) { ^ user.cpp:59:22: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&n); ^ user.cpp:61:41: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d%d",&v[i].x,&v[i].y); ^