宠物收养所
题目:
http://www.zybbs.org/JudgeOnline/problem.php?id=1208
题目大意:
按时间顺序给出来到动物收养所的动物或收养送物的人,如果来得是动物特征值
是a,那么看否有之前来了收养所的人,如果有,找其中人的特征值与a最接近
的一个人,如果没有着将动物留在收养所,。如果来得是人,着找动物,规则一
样。具体见题目;
思路:
唉, 我的思路比较笨,直接搞了两个splayTree,一个是pet,一个是human,
这和我将splayTree封装了应该有很大的关系吧。
我犯的错误:
第一:找最接近k的节点的时候出现了错误,必须将一个节点的左树或者右树(具
体看这个节点和k的大小关系)才能确定最接近k的节点。
第二:删除节点的时候,在删除下面这种情况是出现了错误,rt是要删除的节点
提交情况:wa了若干次,ce了一次
AC code:
#include <cstdio>
#include <cstring>
#include <cstdlib>
#define maxn 1000000
#define mod 1000000
#define INF 2100000000
int min, max;
structsplayTreeNode{
int key, id;
splayTreeNode* son[2],* father;
void init(int k, int chi,splayTreeNode* l, splayTreeNode* r, splayTreeNode* fa){
key = k, id = chi, son[0] = l, son[1] = r, father = fa;
}
};
structsplayTree{
splayTreeNode* nul, *link;
#define rootnul->son[0]
int ad, temp;
splayTree(){
link = newsplayTreeNode[maxn];
ad = 0;
nul = &(link[ad ++]);
nul->init(0, 0, NULL, NULL, NULL);
}
void rotate(splayTreeNode*&rt, int son1,int son2){
splayTreeNode* temp = rt->son[son1];
rt->son[son1] =temp->son[son2];
if(temp->son[son2]!= NULL){
temp->son[son2]->father =rt;
temp->son[son2]->id =son1;
}
temp->son[son2] = rt;
temp->father = rt->father;
temp->id = rt->id;
rt->father = temp;
rt->id = son2;
rt = temp;
}
void splay(splayTreeNode* x,splayTreeNode* rt){
if(x == rt ||x->father == rt) return;
splayTreeNode* y = x->father,* z =x->father->father;
if(z == rt){
if(y->son[0] == x)rotate(z->son[y->id], 0,1);
elserotate(z->son[y->id], 1,0);
}
else{
if(y->id ==x->id){
rotate(z->father->son[z->id],x->id, (x->id)^1);
rotate(y->father->son[y->id],x->id, (x->id)^1);
}
else{
rotate(y->father->son[y->id],x->id, (x->id)^1);
rotate(z->father->son[z->id],y->id, (y->id)^1);
}
}
splay(x, rt);
}
void insert(int x, int chi,splayTreeNode* &rt, splayTreeNode* rf){
if(rt == NULL){
rt = &link[ad ++];
if(rf == nul)nul->son[0] = root;
rt->init(x, chi, NULL, NULL, rf);
splay(rt, this->nul);
return;
}
if(x <rt->key) insert(x, 0, rt->son[0], rt);
else insert(x, 1,rt->son[1], rt);
}
void remove(splayTreeNode*rt){
if(rt == NULL) return;
if(rt->son[0] ==NULL || rt->son[1] == NULL){
if(rt->son[0] ==rt->son[1])rt->father->son[rt->id]= NULL;
else{
temp = (rt->son[0] == NULL) ? 1 : 0;
rt->father->son[rt->id]= rt->son[temp];
rt->son[temp]->father =rt->father;
rt->son[temp]->id =rt->id;
}
splay(rt->father, this->nul);
}
else{
splayTreeNode* tp = rt->son[0];
while(tp->son[1] !=NULL) tp = tp->son[1];
if(tp->father ==rt){
rt->key = tp->key;
rt->son[0] = tp->son[0];
if(tp->son[0] !=NULL) tp->son[0]->father =rt;
}
else{
rt->key = tp->key;
tp->father->son[1] =tp->son[0];
if(tp->son[0] !=NULL){
tp->son[0]->father =tp->father;
tp->son[0]->id = 1;
}
}
splay(rt, this->nul);
}
}
splayTreeNode* find(intk){
splayTreeNode* rt1 = NULL, * rt2 = NULL;
for(splayTreeNode* tp =this->root; tp !=NULL;){
if(k ==tp->key){
min = max = k;
return tp;
}
if(tp->key< k){
if(min <tp->key){
min = tp->key;
rt1 = tp;
}
tp = tp->son[1];
}
else{
if(max >tp->key){
max = tp->key;
rt2 = tp;
}
tp = tp->son[0];
}
}
return (abs(min - k)<= abs(max - k)) ? rt1 : rt2;
}
};
int main(){
int n, a, b;
long long ans;
while(~scanf("%d", &n)){
splayTree pet, human;
ans = 0;
while(n --){
scanf("%d %d",&a, &b);
min = -INF, max = INF;
switch(a){
case 0:
if(human.root != NULL){
splayTreeNode* tp = human.find(b);
ans += abs(b - tp->key);
ans %= mod;
human.remove(tp);
}
else{
pet.insert(b, 0, pet.root, pet.nul);
}
break;
case 1:
if(pet.root != NULL){
splayTreeNode* tp = pet.find(b);
ans += abs(b - tp->key);
ans %= mod;
pet.remove(tp);
}
else{
human.insert(b, 0, human.root, human.nul);
}
break;
}
}
printf("%lld\n",ans);
}
return 0;
}