Compilare: main.cpp: In function 'void dfs1(int)': main.cpp:11:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int ii=0; ii<w[x].size(); ii++) ~~^~~~~~~~~~~~ main.cpp: In function 'void dfs2(int)': main.cpp:28:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int ii=0; ii<w[x].size(); ii++) ~~^~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:39:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("capitala.in","r",stdin); ^ main.cpp:40:39: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("capitala.out","w",stdout); ^ main.cpp:41:19: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ main.cpp:45:28: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&x,&y); ^