kdtree.cpp: In function 'void dfs(int, int)': kdtree.cpp:21: warning: comparison between signed and unsigned integer expressions kdtree.cpp:53: warning: comparison between signed and unsigned integer expressions kdtree.cpp:105: warning: comparison between signed and unsigned integer expressions kdtree.cpp: In function 'int main()': kdtree.cpp:135: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result kdtree.cpp:137: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result kdtree.cpp: In function 'void dfs(int, int)': kdtree.cpp:13: warning: 'elim' may be used uninitialized in this function