Compilare: main.cpp: In function 'void dfs(int)': main.cpp:42:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (index = 0; index < v[node].size(); index++) ~~~~~~^~~~~~~~~~~~~~~~ main.cpp: In function 'void read()': main.cpp:18:30: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d %d", &n, &m); ^ main.cpp:28:31: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d %d", &f, &s); ^