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某校2020专硕编程题-杨辉三角


题目

输入正整数n,输出n行杨辉三角
如:n=4
1
1 1
1 2 1
1 3 3 1

Java实现

public static void test05(){
Scanner sc = new Scanner(System.in);
int n = sc.nextInt();
if (n < 1) return;
int[][] a = new int[n][n];
a[0][0] = 1;
for (int i = 1; i < n; i++) {
for (int j = 0; j < n ; j++) {
a[i][0] = 1;
if (0 < j && j < n-1) {
a[i][j] = a[i-1][j-1] + a[i-1][j];
}
if (j == i){
a[i][j] = 1;
}
}
}
for (int i = 0; i < n; i++) {
for (int j = 0; j < n; j++) {
if (a[i][j] != 0){
System.out.print(a[i][j]+" ");
}

}
System.out.println();
}
}


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