Compilare: user.cpp: In function ‘void dfs_sons(int, int, int, int)’: user.cpp:24: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘void citire()’: user.cpp:34: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp:37: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp: In function ‘void dfs1(int)’: user.cpp:50: warning: comparison between signed and unsigned integer expressions user.cpp:60: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘void dfs2(int, int, int)’: user.cpp:94: warning: comparison between signed and unsigned integer expressions user.cpp:117: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘void dfs3(int)’: user.cpp:133: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘void solve()’: user.cpp:234: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result