izo.cpp: In function 'void dfsw(int)': izo.cpp:33: warning: comparison between signed and unsigned integer expressions izo.cpp: In function 'void dfsv(int)': izo.cpp:54: warning: comparison between signed and unsigned integer expressions izo.cpp: In function 'int main()': izo.cpp:83: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result izo.cpp:85: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result izo.cpp:90: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result