24-08-05 계단 수

yuyu0830/DP/1562.cpp

@@ -0,0 +1,40 @@
+#include <iostream>
+
+#define MOD 1000000000
+
+using namespace std;
+
+int arr[101][10][1024] = {0, };
+
+int main() {
+    int n; cin >> n;
+
+    for (int i = 1; i < 10; i++) {
+        arr[1][i][1 << i] = 1;
+    }
+
+    for (int i = 2; i <= n; i++) {
+        for (int j = 0; j < 10; j++) {
+            for (int k = 0; k < 1024; k++) {
+                if (j) {
+                    arr[i][j][k | (1 << j)] += arr[i - 1][j - 1][k];
+                    arr[i][j][k | (1 << j)] %= MOD;
+                } 
+
+                if (j != 9) {
+                    arr[i][j][k | (1 << j)] += arr[i - 1][j + 1][k];
+                    arr[i][j][k | (1 << j)] %= MOD;
+                }
+            }
+        }
+    }
+
+    int ans = 0;
+
+    for (int i = 0; i < 10; i++) {
+        ans += arr[n][i][1023];
+        ans %= MOD;
+    }
+
+    printf("%d\n", ans);
+}

yuyu0830/README.md

@@ -22,4 +22,5 @@
 | 18차시 | 2024.07.06 |  구현  | [2048 (Easy)](https://www.acmicpc.net/problem/12100)  | - |
 | 19차시 | 2024.07.12 |  재귀  | [우수마을](https://www.acmicpc.net/problem/1949)  | - |
 | 20차시 | 2024.07.22 |  LIS  | [가장 긴 증가하는 부분 수열 5](https://www.acmicpc.net/problem/14003)  | - |
+| 22차시 | 2024.08.05 |  DP  | [계단 수](https://www.acmicpc.net/problem/1562)  | - |
 ---