Create 2089.cpp

HDOJ/2089.cpp

@@ -0,0 +1,55 @@
+#include <cstdio>
+#include <cstdlib>
+#include <cstring>
+using namespace std;
+
+#define MAXLEN 10
+#define MAXNUM 10
+int dp[MAXLEN][MAXNUM];
+int num[MAXLEN];
+char _tmpbuff[MAXLEN];
+
+inline int Deal(int N)
+{
+    sprintf(_tmpbuff,"%d",N);
+    int _len=strlen(_tmpbuff);
+    /// num: 低位存放数字低位(逆序)
+    for(int i=0; i<_len; i++)
+    {
+        num[i]=_tmpbuff[_len-i-1]-'0';
+    }
+    num[_len]=0;
+    int ans=0;
+    for(int i=_len-1; i>=0; i--)
+    {
+        for(int j=0; j<num[i]; j++)
+        {
+            if(num[i+1]==6&&j==2) continue;
+            ans+=dp[i+1][j];///重要 i+1
+        }
+        /// ?
+        if (num[i] == 4 || (num[i + 1] == 6 && num[i] == 2)) break;
+    }
+    return ans;
+}
+
+int main()
+{
+    dp[0][0] = 1;
+    for (int i = 1; i < MAXLEN; ++i)
+        for (int j = 0; j < MAXNUM; ++j)
+            for (int k = 0; k < MAXNUM; ++k)
+                if (j != 4 && !(j == 6 && k == 2))
+                    dp[i][j] += dp[i - 1][k];
+    int n,m;
+    while(scanf("%d %d",&n,&m)==2&&!(n==0&&m==0))
+    {
+        /// Calculate M
+
+        int ans_m=Deal(m+1);
+        int ans_n=Deal(n);
+
+        printf("%d\n",ans_m-ans_n);
+    }
+    return 0;
+}