bzoj 1005 1211 1867

OnlineJudges/lydsy/1005.py

@@ -0,0 +1,41 @@
+def fast_pow(a,b):
+  ans=1
+  while b:
+    if(b%2==1):
+      ans*=a
+    a*=a
+    b/=2
+  return ans
+frac=[1]
+for i in range(1,1001):
+  frac.append(i*frac[-1])
+n=(int)(input())
+m=0
+arr=[]
+for i in range(0,n):
+  arr.append((int)(input()))
+ans=0
+if n==1:
+  if arr[0]==0:
+    ans=1
+  else:
+    ans=0
+else:
+  ans=frac[n-2]
+  left=n-2
+  for i in arr:
+    if i == -1:
+      m+=1
+    elif i==0:
+      ans=0
+      left=0
+      break
+    else:
+      ans/=frac[i-1]
+      left-=i-1
+  if m<2:
+    ans=0
+  else:
+    ans/=frac[left]
+    ans*=fast_pow(m,left)
+print ans

OnlineJudges/lydsy/1211.cpp

@@ -0,0 +1,66 @@
+#include <cstdio>
+typedef long long int64;
+int prime[201], pcnt, cnt[201];
+bool notprime[1001];
+void genPrime()
+{
+    notprime[0] = notprime[1] = true;
+    for (int i = 2; i < 1001; i++)
+        if (!notprime[i])
+            for (int j = i*i; j < 1001; j += i)
+                notprime[j] = true;
+    for (int i = 0; i < 1001; i++)
+        if (!notprime[i])
+            prime[pcnt++] = i;
+}
+int64 fast_pow(int64 x, int y)
+{
+    int64 ans = 1;
+    for (; y; x *= x, y >>= 1)
+        if (y & 1)
+            ans *= x;
+    return ans;
+}
+void decomp(int x, int d)
+{
+    for (int i = 0; i < pcnt && x; i++)
+        while (x % prime[i] == 0)
+        {
+            cnt[i] += d;
+            x /= prime[i];
+        }
+}
+int64 comp()
+{
+    int64 ans = 1;
+    for (int i = 0; i < pcnt; i++)
+        if (cnt[i])
+            ans *= fast_pow(prime[i], cnt[i]);
+    return ans;
+}
+int main()
+{
+    genPrime();
+    int n, sum = 0;
+    scanf("%d", &n);
+    if (n == 1)
+    {
+        scanf("%d", &n);
+        putchar('0' + !n);
+    }
+    else
+    {
+        for (int i = 2; i <= n - 2; i++)
+            decomp(i, 1);
+        for (int i = 0, x; i < n; i++)
+        {
+            scanf("%d", &x);
+            if (x == 0) break;
+            sum += x - 1;
+            for (int j = 2; j < x; j++)
+                decomp(j, -1);
+        }
+        printf("%lld", sum != n - 2 ? 0 : comp());
+    }
+    return 0;
+}

OnlineJudges/lydsy/1867.cpp

@@ -0,0 +1,52 @@
+#include <cstdio>
+#include <iostream>
+typedef unsigned long long int64;
+inline int64 gcd(int64 a, int64 b)
+{
+    int64 tmp;
+    if (a < b) { tmp = a; a = b; b = tmp; } //make sure a>b
+    while (b)
+    {
+        tmp = b;
+        b = a%b;
+        a = tmp;
+    }
+    return a;
+}
+int64 a[51][51];
+char c[51][51];
+int n, m;
+
+void calc(int i, int j)
+{
+    if (j > i || i >= n) return;
+    else
+    {
+        if (c[i][j] == '*')
+        {
+            a[i + 1][j] += (a[i][j] / 2);
+            a[i + 1][j + 1] += (a[i][j] / 2);
+        }
+        else if (c[i][j] == '.')
+        {
+            a[i + 2][j + 1] += a[i][j];
+        }
+        else return;
+    }
+}
+
+int main()
+{
+    scanf("%d%d", &n, &m);
+    int64 total = (1ULL << n);
+    for (int i = 0; i < n; i++)
+        for (int j = 0; j <= i; j++)
+            std::cin >> c[i][j];
+    a[0][0] = total;
+    for (int i = 0; i < n; i++)
+        for (int j = 0; j <= i; j++)
+            calc(i, j);
+    int64 k = gcd(a[n][m], total);
+    printf("%lld/%lld", a[n][m] / k, total / k);
+    return 0;
+}