The kth great number
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【连接】hdu4006点击打开链接
【题目】
The kth great number
Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 65768/65768 K (Java/Others)
Problem Description
Xiao Ming and Xiao Bao are playing a simple Numbers game. In a round Xiao Ming can choose to write down a number, or ask Xiao Bao what the kth great number is. Because the number written by Xiao Ming is too much, Xiao Bao is feeling giddy. Now, try to help Xiao Bao.
Input
There are several test cases. For each test case, the first line of input contains two positive integer n, k. Then n lines follow. If Xiao Ming choose to write down a number, there will be an " I" followed by a number that Xiao Ming will write down. If Xiao Ming choose to ask Xiao Bao, there will be a "Q", then you need to output the kth great number.
Output
The output consists of one integer representing the largest number of islands that all lie on one line.
Sample Input
8 3I 1I 2I 3QI 5QI 4Q
Sample Output
123HintXiao Ming won't ask Xiao Bao the kth great number when the number of the written number is smaller than k. (1=<k<=n<=1000000).
Source
The 36th ACM/ICPC Asia Regional Dalian Site —— Online Contest
【算法】利用集合的自动排序,保留k个元素(输出kth)。
【代码】
#include<algorithm>#include<set>using namespace std;int main(){ multiset<int> M; int a,b,d,i; char c[2]; while(scanf("%d%d",&a,&b)!=EOF) {M.clear(); for(i=0;i<a;i++) { scanf("%s",c); if(c[0]=='I') { scanf("%d",&d); M.insert(d); if(i>b-1) M.erase(M.begin()); } else printf("%d\n",*M.begin()); } } return 0;}
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