Compilare: main.cpp: In function 'void dfs(int)': main.cpp:10:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<adiac[x].size();++i) ~^~~~~~~~~~~~~~~~ main.cpp: In function 'void dfs1(int)': main.cpp:18:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<adiac[x].size();++i) ~^~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:26:15: warning: unused variable 'j' [-Wunused-variable] int n,m,i,j,a,b,start; ^ main.cpp:24:35: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("zapada.in","r",stdin); ^ main.cpp:25:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("zapada.out","w",stdout); ^ main.cpp:27:24: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&m); ^ main.cpp:30:28: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&a,&b); ^ main.cpp:38:16: warning: 'start' may be used uninitialized in this function [-Wmaybe-uninitialized] dfs1(start); ^