Compilare: user.cpp: In function ‘int bfs()’: user.cpp:22: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘void solve()’: user.cpp:43: warning: comparison between signed and unsigned integer expressions user.cpp:40: warning: unused variable ‘i’ user.cpp: In function ‘void dfs(int, int)’: user.cpp:61: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘void read()’: user.cpp:70: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp:75: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp: In function ‘int main()’: user.cpp:97: warning: comparison between signed and unsigned integer expressions