[DP] baekjoon-1932

Author: Seogeurim

README.md

@@ -116,3 +116,11 @@
 | :-: | :----: | :------------------------------------------------------------------------------------------------------------------ | :------------------------ |
 | 01  |     | [Baekjoon-1717 집합의 표현](https://github.com/Seogeurim/Algorithm-practice/blob/master/src/Graph/P1717) |  [Disjoint Set](https://github.com/Seogeurim/Algorithm-practice/blob/master/notes/Graph/DisjointSet.md)  |
 | 02  |     | [Baekjoon-2252 줄 세우기](https://github.com/Seogeurim/Algorithm-practice/blob/master/src/Graph/P2252) |  [위상정렬](https://github.com/Seogeurim/Algorithm-practice/blob/master/notes/Graph/TopologicalSort.md)  |
+
+## Dynamic Programming
+
+> 아직 공부하기 전이라 좋은 코드가 아닐 수 있습니다.
+
+|  #  |   ☆    | Problem                                                                                                             | Note                      |
+| :-: | :----: | :------------------------------------------------------------------------------------------------------------------ | :------------------------ |
+| 01  |     | [Baekjoon-1932 정수 삼각형](https://github.com/Seogeurim/Algorithm-practice/blob/master/src/DP/P1932) |      |

src/DP/P1932/Main.java

@@ -0,0 +1,43 @@
+package DP.P1932;
+
+import java.io.BufferedReader;
+import java.io.FileInputStream;
+import java.io.InputStreamReader;
+import java.util.StringTokenizer;
+
+public class Main {
+
+    static int N;
+    static int[] nums;
+
+    public static void main(String[] args) throws Exception {
+        System.setIn(new FileInputStream("src/DP/P1932/input.txt"));
+        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+
+        N = Integer.parseInt(br.readLine());
+        nums = new int[N * (N + 1) / 2 + 1];
+
+        int count = 1;
+        for (int i = 0; i < N; i++) {
+            StringTokenizer st = new StringTokenizer(br.readLine());
+            for (int j = 0; j <= i; j++) {
+                int value = Integer.parseInt(st.nextToken());
+                if (j == i) {
+                    nums[count] = nums[count - i - 1] + value;
+                } else if (j == 0) {
+                    nums[count] = nums[count - i] + value;
+                } else {
+                    int parent_max = Math.max(nums[count - i - 1], nums[count - i]);
+                    nums[count] = parent_max + value;
+                }
+                count ++;
+            }
+        }
+
+        int ans = 0;
+        for (int i = 0; i < N; i++) {
+            ans = Math.max(nums[nums.length - i - 1], ans);
+        }
+        System.out.println(ans);
+    }
+}

src/DP/P1932/README.md

@@ -0,0 +1,66 @@
+### [baekjoon-1932] 정수 삼각형
+
+![image](https://user-images.githubusercontent.com/22045163/90809734-e2376900-e35c-11ea-9ea4-5d24978f43aa.png)
+
+> 디버깅용 코드 
+
+```java
+import java.io.BufferedReader;
+import java.io.FileInputStream;
+import java.io.InputStreamReader;
+import java.util.Arrays;
+import java.util.StringTokenizer;
+
+public class Main {
+
+    static int N;
+    static Node[] nums;
+
+    public static void main(String[] args) throws Exception {
+        System.setIn(new FileInputStream("src/DP/P1932/input.txt"));
+        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+
+        N = Integer.parseInt(br.readLine());
+
+        nums = new Node[N * (N + 1) / 2 + 1];
+        nums[0] = new Node(0, 0);
+
+        int count = 1;
+        for (int i = 0; i < N; i++) {
+            StringTokenizer st = new StringTokenizer(br.readLine());
+            for (int j = 0; j <= i; j++) {
+                int value = Integer.parseInt(st.nextToken());
+                if (j == i) {
+                    nums[count] = new Node(value, nums[count - i - 1].sum + value);
+                } else if (j == 0) {
+                    nums[count] = new Node(value, nums[count - i].sum + value);
+                } else {
+                    int parent_max = Math.max(nums[count - i - 1].sum, nums[count - i].sum);
+                    nums[count] = new Node(value, parent_max + value);
+                }
+                count ++;
+            }
+        }
+        System.out.println(Arrays.toString(nums));
+    }
+}
+
+class Node {
+    int value;
+    int sum;
+
+    public Node(int value, int sum) {
+        this.value = value;
+        this.sum = sum;
+    }
+
+    @Override
+    public String toString() {
+        return "Node{" +
+                "value=" + value +
+                ", sum=" + sum +
+                '}';
+    }
+}
+
+```

src/DP/P1932/input.txt

@@ -0,0 +1,6 @@
+5
+7
+3 8
+8 1 0
+2 7 4 4
+4 5 2 6 5