- 题目描述:
-
Output the k-th prime number.
- 输入:
-
k≤10000
- 输出:
-
The k-th prime number.
- 样例输入:
-
3 7
- 样例输出:
-
5 17
代码:#include<stdio.h> #include<math.h> #include<string.h> #define N 200000 int main() { int x[N] = {0}; int temp; int index; int k; x[0] = x[1] = 1; for(int i = 2; i < N; i++) { if(x[i] == 0) { temp = 2 * i; while(temp <= N) { x[temp] = 1; temp += i; } } } while(scanf("%d",&k) != EOF) { index = 0; for(int i = 2; i < N; i++) { if(x[i] == 0) index++; if(index == k) { printf("%d\n",i); break; } } } return 0; }