Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:9: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘int main()’: user.cpp:21: warning: unused variable ‘nrc’ user.cpp:24: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp:26: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp:34: warning: ‘k’ may be used uninitialized in this function