[#3] 2021.12.18 백준단계별8.기본수학 4문제

Boj/기본 수학1/1193.py

@@ -0,0 +1,23 @@
+x = int(input())
+group = 0
+a = 0
+b = 0
+while x > group*(group+1)/2:
+    group = group+1
+
+# 해당 그룹 내에서 몇번째? -> K
+k = x - (group-1) * (group) // 2
+
+if x == 1:
+    print("1/1")
+    exit(0)
+
+if group%2==0:
+    # 순방향
+    a = k
+    b = group+1-a
+else:
+    b = k
+    a = group+1-b
+
+print("%d/%d"%(a,b))

Boj/기본 수학1/1712.py

@@ -0,0 +1,10 @@
+a, b, c = map(int, input().split())
+
+result = 0
+
+if a + (b - c) * 2 >= a + b - c:
+    result = -1
+    print(result)
+else:
+    result = a//(c - b) + 1
+    print(result)

Boj/기본 수학1/2292.py

@@ -0,0 +1,13 @@
+n = int(input())
+room = 0
+count = 2
+while True:
+    if n == 1:
+        room = 1
+        break
+    if count > n:
+        break
+    count = count + 6*room
+    room = room + 1
+
+print(room)

Boj/기본 수학1/2869.py

@@ -0,0 +1,5 @@
+import math
+a, b, v = map(int, input().split())
+ans = math.ceil((v-b)/(a-b))
+
+print(ans)