2024-07-20 00:58:40

Affected files:
.obsidian/workspace.json
src/content/blog/boj-19951-태상이의-훈련소-생활.md

.obsidian/workspace.json

@@ -4,16 +4,16 @@
     "type": "split",
     "children": [
       {
-        "id": "2676f6981de71d52",
+        "id": "5618ed33c29b957d",
         "type": "tabs",
         "children": [
           {
-            "id": "a33d3c979b188989",
+            "id": "72d69f1c38fd96fe",
             "type": "leaf",
             "state": {
               "type": "markdown",
               "state": {
-                "file": "src/content/blog/boj-15661-링크와-스타트.md",
+                "file": "src/content/blog/boj-2564-경비원.md",
                 "mode": "source",
                 "source": false
               }
@@ -22,16 +22,16 @@
         ]
       },
       {
-        "id": "5618ed33c29b957d",
+        "id": "d569986bbfee2eb7",
         "type": "tabs",
         "children": [
           {
-            "id": "72d69f1c38fd96fe",
+            "id": "a9e50a64c182f8d4",
             "type": "leaf",
             "state": {
               "type": "markdown",
               "state": {
-                "file": "src/content/blog/boj-2564-경비원.md",
+                "file": "src/content/blog/boj-19951-태상이의-훈련소-생활.md",
                 "mode": "source",
                 "source": false
               }
@@ -103,7 +103,7 @@
             "state": {
               "type": "backlink",
               "state": {
-                "file": "src/content/blog/boj-2564-경비원.md",
+                "file": "src/content/blog/boj-19951-태상이의-훈련소-생활.md",
                 "collapseAll": false,
                 "extraContext": false,
                 "sortOrder": "alphabetical",
@@ -120,7 +120,7 @@
             "state": {
               "type": "outgoing-link",
               "state": {
-                "file": "src/content/blog/boj-2564-경비원.md",
+                "file": "src/content/blog/boj-19951-태상이의-훈련소-생활.md",
                 "linksCollapsed": false,
                 "unlinkedCollapsed": true
               }
@@ -143,7 +143,7 @@
             "state": {
               "type": "outline",
               "state": {
-                "file": "src/content/blog/boj-2564-경비원.md"
+                "file": "src/content/blog/boj-19951-태상이의-훈련소-생활.md"
               }
             }
           }
@@ -166,9 +166,10 @@
       "table-editor-obsidian:Advanced Tables Toolbar": false
     }
   },
-  "active": "72d69f1c38fd96fe",
+  "active": "a9e50a64c182f8d4",
   "lastOpenFiles": [
     "src/content/blog/boj-2564-경비원.md",
+    "src/content/blog/boj-19951-태상이의-훈련소-생활.md",
     "src/content/blog/boj-15661-링크와-스타트.md",
     "src/content/blog/boj-2529-부등호.md",
     "src/content/blog/leet-code-919-complete-binary tree-inserter.md",
@@ -194,7 +195,6 @@
     "src/content/blog/boj-11057-.md",
     "src/content/blog/boj-1940-주몽.md",
     "src/content/blog/install-neovim-using-aqua-on-ubuntu.md",
-    "src/content/blog/how-to-connect-wifi-on-ubuntu-server.md",
     "dist/posts/aqua를-이용해-wsl-ubuntu에-neovim을-설치하자.png",
     "dist/assets/[email protected]",
     "dist/assets/forrest-gump-quote.webp.jpg",

src/content/blog/boj-19951-태상이의-훈련소-생활.md

@@ -0,0 +1,56 @@
+---
+author: Gyunseo Lee
+title: "BOJ 백준 19951: 태상이의 훈련소 생활"
+pubDatetime: 2024-07-20T00:55:00+09:00
+modDatetime: 2024-07-20T00:55:00+09:00
+featured: false
+draft: false
+tags:
+  - PS
+  - BOJ
+  - Algorithms
+  - 실랜디
+  - 골랜디
+  - PrefixSum
+description: 시간 복잡도를 보면서 어떤 알고리즘을 쓸지 잘 생각해 보자
+ogImage: ""
+---
+
+## Table of contents
+
+## 들어가며
+
+걸린 시간: 1시간 (자력으로 풀지 못함)
+
+문제를 읽고, N이 최대 10만이길래, query를 최적화하면 되겠거니 했습니다.
+
+## 접근
+
+![](https://res.cloudinary.com/gyunseo-blog/image/upload/f_auto/v1721404675/image_diwxzn.png)
+
+근데 query에서의 시간 복잡도를 도저히 최적화를 하지 못하겠어서, 풀지 못했습니다.  
+태그를 까보니 누적합이었고, 사실 누적합인 걸 봐도 못 풀겠어서 인터넷에서 솔루션을 보고 이해를 했습니다.
+
+## 구현
+
+```python
+import sys
+
+input = sys.stdin.readline
+from bisect import bisect_left, bisect_right
+if __name__ == "__main__":
+    N, M = map(int, input().strip().split())
+    HList = [0] + [*map(int, input().strip().split())]
+    prefixSumList = [0 for _ in range(N + 1 + 1)]
+
+    for _ in range(M):
+        a, b, k = map(int, input().strip().split())
+        prefixSumList[a] += k
+        prefixSumList[b + 1] += -k
+
+    for i in range(1, N + 1):
+        prefixSumList[i + 1] += prefixSumList[i]
+
+    for i in range(1, N + 1):
+        print(HList[i] + prefixSumList[i], end = " ")
+```