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蛇形矩阵
http://www.nowcoder.com/questionTerminal/649b210ef44446e3b1cd1be6fa4cab5e
import java.util.*;
public class Main {
public static void main(String[] args){
Scanner sc = new Scanner(System.in);
while(sc.hasNext()){
int n = sc.nextInt();
StringBuffer str = new StringBuffer();
int a = 1;
int b = 0;
for(int i=0;i<n;i++){
a = a +i;
b = a;
for(int j=0;j<n-i;j++){
str.append(b+" ");
b = b+ j+i+2;
}
System.out.println(str.toString().trim());
str = new StringBuffer();
}
}
}
}
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