delete pics to save space

1.1655.py

@@ -0,0 +1,170 @@
+from sys import *
+
+# IO
+def isprint(ch):
+    isp=['A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T','U','V','W','X','Y','Z',
+         'a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z',
+         '0','1','2','3','4','5','6','7','8','9',
+         '~','`','!','@','#','$','%','^','&','*','(',')',
+         '-','_','=','+','[','{',']','}','\\','|',
+         ';',':','\'','"',
+         ',','<','.','>','/','?']
+    return ch in isp
+class Input:
+    io_line_buf=""
+    io_line_buf_size=0
+    io_line_buf_cnt=0
+    file=stdin
+    eof=False
+    
+    def __init__(self,f=stdin):
+        self.io_line_buf=""
+        self.io_line_buf_size=0
+        self.io_line_buf_cnt=0
+        self.file=f
+        self.eof=False
+
+    def freopen(self,name):
+        self.io_line_buf=""
+        self.io_line_buf_size=0
+        self.io_line_buf_cnt=0
+        self.file=open(name)
+        self.eof=False
+    
+    def alloc(self):
+        if self.io_line_buf_cnt>=self.io_line_buf_size:
+            self.io_line_buf=self.file.readline()
+            self.io_line_buf_size=len(self.io_line_buf)
+            self.io_line_buf_cnt=0
+            if self.io_line_buf_size == 0 :
+                self.eof=True
+    
+    def getchar(self):
+        self.alloc()
+        if self.eof:
+            return '\0'
+        self.io_line_buf_cnt=self.io_line_buf_cnt+1
+        return self.io_line_buf[self.io_line_buf_cnt-1]
+    
+    def getline(self):
+        self.alloc()
+        if self.eof:
+            return ''
+        if self.io_line_buf[-1:]=='\n':
+            res=self.io_line_buf[self.io_line_buf_cnt:-1]
+        else:
+            res=self.io_line_buf[self.io_line_buf_cnt:]
+        self.io_line_buf_cnt=len(self.io_line_buf)
+        return res
+    
+    def read_int(self):
+        vali=['-','0','1','2','3','4','5','6','7','8','9']
+        S=""
+        ch=""
+        while not self.eof:
+            ch=self.getchar()
+            if ch in vali :
+                break
+        S=ch
+        while not self.eof:
+            ch=self.getchar()
+            if not ( ch in vali ) :
+                break
+            S=S+ch
+        return int(S)
+    
+    def read_float(self):
+        vali=['.','-','0','1','2','3','4','5','6','7','8','9']
+        S=""
+        ch=""
+        while not self.eof:
+            ch=self.getchar()
+            if ch in vali :
+                break
+        S=ch
+        while not self.eof:
+            ch=self.getchar()
+            if not ( ch in vali ) :
+                break
+            S=S+ch
+        return int(S)
+    
+    def read_str(self):
+        S=""
+        ch=""
+        while not self.eof:
+            ch=self.getchar()
+            if isprint(ch):
+                break;
+        S=ch
+        while not self.eof:
+            ch=self.getchar()
+            if not isprint(ch):
+                break;
+            S=S+ch
+        return S
+    
+    def read_char(self):
+        ch=""
+        while not self.eof:
+            ch=self.getchar()
+            if isprint(ch):
+                break
+        return ch
+    
+    def scanf(self,flist):
+        out=[]
+        for tp in flist:
+            if tp == 'D' or tp == 'd' :
+                out.append(self.read_int())
+            elif tp == 'F' or tp == 'f' :
+                out.append(self.read_float())
+            elif tp == 'C' or tp == 'c' :
+                out.append(self.read_char())
+            else:
+                out.append(self.read_str())
+        if len(out) == 1:
+            return out[0]
+        else:
+            return out
+
+IO_inf=Input()
+
+def scanf(flist):
+    return IO_inf.scanf(flist)
+def getchar():
+    return IO_inf.getchar()
+def getline():
+    return IO_inf.getline()
+
+# Data Struct
+def Array(*idx,dft=0):
+    ary=[]
+    idx=list(idx)
+    idx.reverse()
+    for i in range(0,idx[0]):
+        ary.append(dft)
+    for rg in idx[1:]:
+        x=[]
+        for j in range(0,rg):
+            x.append(ary[:])
+        ary=x
+    return ary
+
+n=0
+m=0
+C=Array(105,105)
+C[0][0]=1
+for i in range(1,101):
+    for j in range(1,i+1):
+        C[i][j]=C[i-1][j]*j+C[i-1][j-1]
+
+try:
+	while IO_inf.eof==False:
+		n,m=scanf("DD")
+		if m>n:
+			print(0)
+		else:
+			print(C[n][m])
+except ValueError:
+	pass