You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
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# include <bits/stdc++.h>
using namespace std ;
const int N = 25 ;
typedef long long LL ;
LL f [ N ] [ N ] [ N ] ;
LL w ( LL a , LL b , LL c ) {
//注意判断的顺序，
if ( a < = 0 | | b < = 0 | | c < = 0 ) return 1 ;
else if ( a > 20 | | b > 20 | | c > 20 ) return w ( 20 , 20 , 20 ) ;
else if ( f [ a ] [ b ] [ c ] ) return f [ a ] [ b ] [ c ] ;
else if ( a < b & & b < c ) f [ a ] [ b ] [ c ] = w ( a , b , c - 1 ) + w ( a , b - 1 , c - 1 ) - w ( a , b - 1 , c ) ;
else f [ a ] [ b ] [ c ] = w ( a - 1 , b , c ) + w ( a - 1 , b - 1 , c ) + w ( a - 1 , b , c - 1 ) - w ( a - 1 , b - 1 , c - 1 ) ;
return f [ a ] [ b ] [ c ] ;
}
int main ( ) {
LL a , b , c ;
while ( cin > > a > > b > > c ) {
if ( a = = - 1 & & b = = - 1 & & c = = - 1 ) break ;
cout < < " w( " < < a < < " , " < < b < < " , " < < c < < " ) = " ;
cout < < w ( a , b , c ) < < endl ;
}
return 0 ;
}
