delete pics to save space

2.1638.cpp

@@ -0,0 +1,23 @@
+#include<cstdio>
+const int maxn=20;
+long long d[maxn+1][maxn+1][maxn+1];
+int i,j,k,T,n,L,R;
+int main()
+{
+	d[1][1][1]=1;
+	for(i=2;i<=maxn;i++)
+		for(j=1;j<=i;j++)
+			for(k=1;k<=i;k++)
+			{
+				d[i][j][k]=d[i-1][j][k]*(i-2);
+				if(j>1) d[i][j][k]+=d[i-1][j-1][k];
+				if(k>1) d[i][j][k]+=d[i-1][j][k-1];
+			}
+	scanf("%d",&T);
+	while(T-->0)
+	{
+		scanf("%d%d%d",&n,&L,&R);
+		printf("%lld\n",d[n][L][R]);
+	}
+	return 0;
+}