spiridusi.cpp: In function 'void DFS(int)': spiridusi.cpp:51: warning: comparison between signed and unsigned integer expressions spiridusi.cpp: In function 'int main()': spiridusi.cpp:64: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result spiridusi.cpp:65: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result spiridusi.cpp:66: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result spiridusi.cpp:69: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result