折戟沉沙

#include<iostream> #include<cstdio> #include<cmath> #include<cstring> #include<algorithm> #include<cstdlib> #include<vector> #define fo(i,a,b) for(int i=a;i<=b;i++) #define fod(i,a,b) for(int i=a;i>=b;

分析:求出1~1e4的所有素数然后暴力判断即可 Code:#include<iostream> #include<cstdio> #include<cmath> #include<cstring> #include<algorithm> #include<cstdlib> #include<vector> #define fo(i,a,b) for(int i=a;i<=b;i++) #define