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:41:22: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&n); ^ main.cpp:45:31: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d%d",&x,&y); ^