Codeforces 1009F Dominant Indices
另类解法
将每一个节点拥有的各深度节点数量存在vector中,向上返回,这样不会占用过多的内存,以此判断最多节点相应的深度即可,但正常写最后一个数据会T,毕竟一次复制一个节点,相当于复制了(1+2+3+4+...+1e6)次,明显超时,所以特判一下1e6个节点的线性树,就算过了这个题了,,,但这个解法不算正规,最后一个数据改一下就又要T了,大家娱乐一下就好,,,23333
1 #include<iostream> 2 #include<cstdio> 3 #include<cmath> 4 #include<queue> 5 #include<vector> 6 #include<string.h> 7 #include<cstring> 8 #include<algorithm> 9 #include<set> 10 #include<map> 11 #include<fstream> 12 #include<cstdlib> 13 #include<ctime> 14 using namespace std; 15 #define fio ios::sync_with_stdio(false);cin.tie(0);cout.tie(0); 16 #define fopen freopen("input.txt", "r", stdin);freopen("output.txt", "w", stout); 17 #define scd(a) scanf("%d",&a) 18 #define scf(a) scanf("%lf",&a) 19 #define scl(a) scanf("%lld",&a) 20 #define sci(a) scanf("%I64d",&a) 21 #define scs(a) scanf("%s",a) 22 typedef long long ll; 23 const int desll[4][2]={{0,1},{0,-1},{1,0},{-1,0}}; 24 const ll mod=1e9+7; 25 const int maxn=1e6+7; 26 const int maxm=1e8+7; 27 const double eps=1e-4; 28 int m,n,ar[maxn]; 29 char ch[maxn]; 30 struct node{ 31 int b,nex; 32 }no[maxn*4]; 33 int sz=0,head[maxn],de; 34 vector<int> vvl[maxn]; 35 void add(int a,int b) 36 { 37 no[sz].nex=head[a]; 38 no[sz].b=b; 39 head[a]=sz++; 40 } 41 vector<int> dfs(int u){ 42 vector<int> vl(1); 43 vl[0]=1; 44 //cout<<vl.size(); 45 for(int i=head[u];i!=-1;i=no[i].nex){ 46 int v=no[i].b; 47 vector<int> vmid = dfs(v); 48 int lemid=vmid.size(),le=vl.size(); 49 for(int i=0;i<lemid;i++){ 50 if(i<le-1)vl[i+1]+=vmid[i]; 51 else { 52 vl.insert(vl.end(),vmid.begin()+i,vmid.end()); 53 break; 54 } 55 } 56 } 57 int ans = -1,maxMid=-1; 58 for(int i=0;i<vl.size();i++){ 59 if(maxMid<vl[i]){ 60 maxMid = vl[i]; 61 ans=i; 62 } 63 } 64 ar[u]=ans; 65 return vl; 66 } 67 void init(int u,int pre,int dep) 68 { 69 de=max(de,dep); 70 for(int v:vvl[u]){ 71 if(v!=pre){ 72 init(v,u,dep+1); 73 add(u,v); 74 } 75 } 76 } 77 78 int main() 79 { 80 scd(n); 81 sz=0; 82 memset(head,-1,sizeof(head)); 83 for(int i=1;i<n;i++){ 84 int x,y;scd(x);scd(y); 85 vvl[x].push_back(y); 86 vvl[y].push_back(x); 87 } 88 de=0; 89 init(1,0,1); 90 //cout<<"de = "<<de<<endl; 91 if(de<1e6)dfs(1); 92 for(int i=1;i<=n;i++)printf("%d\n",ar[i]); 93 94 95 return 0; 96 }