Compilare: user.cpp: In function ‘int main()’: user.cpp:56:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j=0;j<M.size();j++) { ^ user.cpp:58:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<X.size()-1;i++) { ^ user.cpp:88:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<X.size()-1;i++) ^ user.cpp:31:29: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d%d",&n,&m); ^ user.cpp:32:31: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d%d",&xa,&ya); ^ user.cpp:37:33: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d%d",&x,&y); ^ user.cpp:92:33: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d%d",&x,&y); ^