20-alstjr7437

alstjr7437/BFS/숨바꼭질.py

@@ -0,0 +1,28 @@
+from collections import deque
+
+n, k = map(int, input().split())
+
+result = [0] * 100001
+result[n] = 1
+
+queue = deque()
+queue.append(n)
+
+while queue:
+    now = queue.popleft()
+    if now == k:
+        break
+    # -1 로직
+    if now - 1 >= 0 and result[now-1] == 0 :
+        queue.append(now-1)
+        result[now-1] = result[now] + 1
+    # +1 로직
+    if now + 1 < len(result) and result[now+1] == 0:
+        queue.append(now+1)
+        result[now+1] = result[now] + 1
+    # *2 로직
+    if now * 2 < len(result) and result[now * 2] == 0:
+        queue.append(now*2)
+        result[now*2] = result[now] + 1
+
+print(result[k] - 1)

alstjr7437/DP/구간-나누기.py

@@ -0,0 +1,21 @@
+# n, m = map(int,input())
+
+# num = [ i for i in range(n): int(input())]
+
+# dp = [[-1e9] * m for _ in range(n+1)]
+# for i in range(n):
+
+import sys
+input = sys.stdin.readline
+
+n, m = map(int, input().split())
+dp1 = [[0]+[-1e9]*m for i in range(n+1)]
+dp2 = [[0]+[-1e9]*m for i in range(n+1)]
+num = [int(input()) for i in range(n) ]
+
+for i in range(1, n+1):
+    for j in range(1, min(m, (i+1)//2)+1):
+        dp2[i][j]=max(dp1[i-1][j], dp2[i-1][j])
+        dp1[i][j]=max(dp1[i-1][j], dp2[i-1][j-1])+num[i-1]
+print(max(dp1[n][m], dp2[n][m]))
+

alstjr7437/README.md

@@ -17,4 +17,8 @@
 | 13차시 | 2024.02.29 |  DP  | <a href="https://www.acmicpc.net/problem/10844">쉬운 계단 수</a> | https://github.com/AlgoLeadMe/AlgoLeadMe-6/pull/42 |
 | 14차시 | 2024.03.03 |  브루트포스  | <a href="https://www.acmicpc.net/problem/18111">마인크래프트</a> | https://github.com/AlgoLeadMe/AlgoLeadMe-6/pull/48 |
 | 15차시 | 2024.03.09 |  우선순위 큐  | <a href="https://www.acmicpc.net/problem/13975">파일 합치기3</a> | https://github.com/AlgoLeadMe/AlgoLeadMe-6/pull/53 |
-| 16차시 | 2024.03.13 |  정렬  | <a href="https://www.acmicpc.net/problem/2170">선 긋기</a> | https://github.com/AlgoLeadMe/AlgoLeadMe-6/pull/57 |
+| 16차시 | 2024.03.13 |  정렬  | <a href="https://www.acmicpc.net/problem/2170">선 긋기</a> | https://github.com/AlgoLeadMe/AlgoLeadMe-6/pull/57 |
+| 17차시 | 2024.03.16 |  DP  | <a href="https://www.acmicpc.net/problem/2228">구간 나누기</a> | https://github.com/AlgoLeadMe/AlgoLeadMe-6/pull/61 |
+| 18차시 | 2024.03.23 |  다익스트라  | <a href="https://www.acmicpc.net/problem/1753">최단 경로</a> | https://github.com/AlgoLeadMe/AlgoLeadMe-6/pull/66 |
+| 19차시 | 2024.03.27 |  문자열  | <a href="https://www.acmicpc.net/problem/5525">IOIOI</a> | https://github.com/AlgoLeadMe/AlgoLeadMe-6/pull/67 |
+| 20차시 | 2024.04.03 |  BFS  | <a href="https://www.acmicpc.net/problem/1697">숨바꼭질</a> | https://github.com/AlgoLeadMe/AlgoLeadMe-6/pull/70 |

alstjr7437/구현/IOIOI.swift

@@ -0,0 +1,41 @@
+let n = Int(readLine()!)!
+let m = Int(readLine()!)!
+
+let s = readLine()!.map{$0}
+
+var result = 0
+var cur = 0
+var count = 0
+
+while cur < m-2{
+    if String(s[cur...cur + 2]) == "IOI"{
+        count += 1
+        cur += 2
+        if count == n{
+            result += 1
+            count -= 1
+        }
+    } else {
+        count = 0
+        cur += 1
+    }
+}
+
+print(result)
+
+
+"""
+50점짜리 코드
+
+var p = "I" 
+for _ in 0 ..< n{
+    p += "OI"
+}
+
+for i in 0..<m-p.count+1{
+    if String(s[i..<i+p.count]) == p{
+        result += 1
+    }
+}
+"""
+

alstjr7437/그래프/최단경로.py

@@ -0,0 +1,40 @@
+from heapq import *
+import sys
+
+input = sys.stdin.readline
+
+v, e = map(int, input().split())
+k = int(input())
+
+# 그래프 만들기
+graph = [[] for _ in range(v + 1)]
+for _ in range(e):
+    a, b, c = map(int, input().split())
+    graph[a].append((c, b))  
+
+# 결과 저장할 변수 만들기
+heap = []
+result = [int(1e9)] * (v + 1)
+
+# k 넣기
+result[k] = 0
+heappush(heap, (0, k))  
+
+# 다익스트라 돌리기
+while heap:
+    weight, now = heappop(heap)  
+    # print(weight,now, heap, result)
+    if result[now] < weight:
+        continue
+    for next_weight, next_node in graph[now]:
+        total_weight = weight + next_weight
+        if total_weight < result[next_node]:
+            result[next_node] = total_weight
+            heappush(heap, (total_weight, next_node))
+
+# 결과 출력하기
+for i in range(1, v + 1):
+    if result[i] == int(1e9):
+        print("INF")
+    else:
+        print(result[i])