View Compilation Error

0_0_38259748_20353\Main.java:1: 错误: 非法字符: '#'
#include <iostream>
^
0_0_38259748_20353\Main.java:1: 错误: 需要class, interface或enum
#include <iostream>
         ^
0_0_38259748_20353\Main.java:2: 错误: 非法字符: '#'
#include <algorithm>
^
0_0_38259748_20353\Main.java:4: 错误: 非法字符: '#'
#define lowbit(x) (x&(-x))
^
0_0_38259748_20353\Main.java:4: 错误: 需要class, interface或enum
#define lowbit(x) (x&(-x))
        ^
0_0_38259748_20353\Main.java:6: 错误: 需要class, interface或enum
const int MAX = 1001;
^
0_0_38259748_20353\Main.java:7: 错误: 需要class, interface或enum
int mat[1002][1002];
^
0_0_38259748_20353\Main.java:8: 错误: 需要class, interface或enum
int com[1002][1002];
^
0_0_38259748_20353\Main.java:9: 错误: 需要class, interface或enum
void modify ( int x,int y, int n )
^
9 个错误