Compilare: main.cpp: In function 'void dfs1(int)': main.cpp:56:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<g[nod].size(); i++) ~^~~~~~~~~~~~~~ main.cpp: In function 'void dfs2(int)': main.cpp:66:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<g[nod].size(); i++) ~^~~~~~~~~~~~~~ main.cpp: In function 'char read_ch()': main.cpp:23:33: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(_in_buff, 1, 4096, _fin); ^ main.cpp: In function 'int main()': main.cpp:95:12: warning: 'x' may be used uninitialized in this function [-Wmaybe-uninitialized] dfs1(x); ^