更新

作业/刘航宇-day44/第一题/PTable.java

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+import java.util.*;
+
+public class PTable {
+    public static void main(String[] args) {
+        Scanner in = new Scanner(System.in);
+        int n = in.nextInt();
+        for (int i = 1; i <= n; i++) {
+            StringBuilder sb = new StringBuilder();
+            for (int j = 1; j <= n; j++) {
+                if (j > 1) sb.append(' ');
+                sb.append(i * j);
+            }
+            System.out.println(sb.toString());
+        }
+        in.close();
+    }
+}

作业/刘航宇-day44/第三题/P2969.java

@@ -0,0 +1,17 @@
+import java.util.*;
+
+public class P2969 {
+    public static void main(String[] args) {
+        Scanner in = new Scanner(System.in);
+        int n = in.nextInt();
+        for (int i = 0; i < n; i++) {
+            int stars = i <= n / 2 ? (2 * i + 1) : (2 * (n - i - 1) + 1);
+            int spaces = (n - stars) / 2;
+            StringBuilder row = new StringBuilder();
+            for (int s = 0; s < spaces; s++) row.append(' ');
+            for (int k = 0; k < stars; k++) row.append('*');
+            System.out.println(row.toString());
+        }
+        in.close();
+    }
+}

作业/刘航宇-day44/第二题/P2984.java

@@ -0,0 +1,26 @@
+import java.util.*;
+
+public class P2984 {
+    public static void main(String[] args) {
+        Scanner in = new Scanner(System.in);
+        int n = in.nextInt();
+        List<Long> prev = new ArrayList<>();
+        for (int row = 1; row <= n; row++) {
+            List<Long> cur = new ArrayList<>(row);
+            long val = 1;
+            for (int i = 0; i < row; i++) {
+                if (i == 0) val = 1;
+                else val = cur.get(i - 1) * (row - i) / i;
+                cur.add(val);
+            }
+            StringBuilder sb = new StringBuilder();
+            for (int i = 0; i < cur.size(); i++) {
+                if (i > 0) sb.append(' ');
+                sb.append(cur.get(i));
+            }
+            System.out.println(sb.toString());
+            prev = cur;
+        }
+        in.close();
+    }
+}