給出n個人的權值,每次要求將兩隊人合成一堆,或者殺掉一堆人中的權值最小的那個人。問每次刪除的人的權值是多少。
就是可並堆,沒了。我挑最簡單的隨機堆寫的。
#include
#include
#include
#include
#define MAX 1000010
using namespace std;
struct Heap{
Heap *son[2];
int val;
Heap(int _):val(_) {
son[0] = son[1] = NULL;
}
Heap() {}
}*heap[MAX],mempool[MAX],*C = mempool + 1;
Heap *Merge(Heap *x,Heap *y)
{
if(x == NULL) return y;
if(y == NULL) return x;
if(x->val > y->val) swap(x,y);
bool k = rand()&1;
x->son[k] = Merge(x->son[k],y);
return x;
}
int points,asks;
int src[MAX];
bool killed[MAX];
char s[10];
int father[MAX];
int Find(int x)
{
if(father[x] == x) return x;
return father[x] = Find(father[x]);
}
int main()
{
srand(19970806);
cin >> points;
for(int i = 1; i <= points; ++i)
father[i] = i;
for(int x,i = 1; i <= points; ++i) {
scanf("%d",&x);
heap[i] = new (C++)Heap(x);
}
cin >> asks;
for(int x,y,i = 1; i <= asks; ++i) {
scanf("%s",s);
if(s[0] == 'M') {
scanf("%d%d",&x,&y);
if(killed[x] || killed[y]) continue;
int fx = Find(x),fy = Find(y);
if(fx == fy) continue;
father[fy] = fx;
heap[fx] = Merge(heap[fx],heap[fy]);
}
else {
scanf("%d",&x);
if(killed[x]) {
puts("0");
continue;
}
int fx = Find(x);
printf("%d\n",heap[fx]->val);
killed[heap[fx] - mempool] = true;
heap[fx] = Merge(heap[fx]->son[0],heap[fx]->son[1]);
}
}
return 0;
}