103차 2번 문제풀이(푸는중)

Author: gmlrude

live10/test103/문제2/박희경.py

@@ -0,0 +1,46 @@
+"""
+dp[0] = -1
+dp[1] = -1
+dp[2] = -1
+dp[3] = 1
+dp[4] = -1
+dp[5] = 1
+dp[6] = 2
+dp[7] = -1
+dp[8] = 1(5) + 1(3) = 2     // dp[5] + dp[3]
+dp[9] = 3                   // dp[3] * 3
+dp[10] = 2                  // dp[5] * 2
+dp[11] = 1 + 2              // dp[5] + dp[6]
+dp[12] = 4                  // dp[6] * 2
+dp[13] =                    // dp[3] + dp[10]
+dp[14]                      // dp[5] + dp[9]
+dp[15] = 3                  // dp[5] * 3
+dp[16] = -1                 // dp[5] + dp[11]
+dp[17] = -1                 // dp[5] + dp[12]
+dp[18] = 3 + 1 = 4          // dp[3] + dp[15]
+
+"""
+
+import sys
+
+input = sys.stdin.readline
+
+n = int(input())
+
+res = 0
+dp = [-1] * 50001
+dp[3] = 1
+dp[4] = -1
+dp[5] = 1
+dp[6] = 2
+dp[7] = -1
+
+for i in range(8, n + 1):
+    if (i - 5) % 5 == 0:
+        dp[i] = dp[i - 5] + dp[5]
+    elif (i - 3) % 3 == 0:
+        dp[i] = dp[i-3] + dp[3]
+    else:
+        dp[i] = -1
+
+print(dp[n])