copaci3.cpp: In function 'void DFS2(int, int)': copaci3.cpp:24: warning: comparison between signed and unsigned integer expressions copaci3.cpp: In function 'void DFS(int, int)': copaci3.cpp:34: warning: comparison between signed and unsigned integer expressions copaci3.cpp: In function 'int main()': copaci3.cpp:41: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result copaci3.cpp:44: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result copaci3.cpp:52: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result