Compilare: main.cpp: In function 'void ddfs(int)': main.cpp:43:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<g[dad].size();i++){ ~^~~~~~~~~~~~~~ main.cpp: In function 'void dfs(int)': main.cpp:93:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<g[dad].size();i++){ ~^~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:103:39: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("disconnect.in","r",stdin); ^ main.cpp:104:41: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("disconnect.out","w",stdout); ^ main.cpp:105:24: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&m); ^ main.cpp:109:28: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&x,&y); ^ main.cpp:117:36: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d",&type,&x,&y); ^