http://poj.org/problem?id=1001 #include <iostream> #include <string.h> using namespace std ; char R[10] , Num[160] ; int n , L , Point , i , j , l , k ; int f[160] , c[160] , A[160] ; int x , y , z , LA , Lf , w ; int main() { while ( cin >> R >> n ) { L = 0 ; Point = 0 ; for ( k = 0 ; k < strlen(R) ; k ++ ) if ( R[k] != '0' ) break ; for ( i = k ; i < strlen(R) ; i ++ ) if ( R[i] == '.' ) break ; for ( j = strlen(R)-1 ; i < j ; j -- ) if ( R[j] != '0' ) break ; for ( l = k ; l <= j ; l ++ ) if ( R[l] != '.' ) Num[++L] = R[l] ; else Point = j - l ; for ( i = 1 ; i < 160 ; i ++ ) { f[i] = 0 ; c[i] = 0 ; A[i] = 0 ; } f[1] = 1 ; Lf = 1 ; LA = 0 ; for ( j = L ; j >= 1 ; j -- ) A[++LA] = Num[j]-'0' ; for ( i = 1 ; i <= n ; i ++ ) { for ( j = 1 ; j <= Lf ; j ++ ) c[j] = 0 ; for ( j = 1 ; j <= LA ; j ++ ) for ( k = 1 ; k <= Lf ; k ++ ) { x = A[j] * f[k] ; y = x / 10 ; z = x % 10 ; w = j + k - 1 ; c[w] += z ; c[w+1] += (c[w]/10 + y) ; c[w] %= 10 ; } Lf += LA ; while ( c[Lf] == 0 ) Lf -- ; for ( j = 1 ; j <= Lf ; j ++ ) f[j] = c[j] ; } if ( Lf < Point * n ) { cout << "." ; for ( i = Point * n ; i > Lf ; i -- ) cout << "0" ; } for ( i = Lf ; i >= 1 ; i -- ) { if ( i == Point * n ) cout << "." ; cout << f[i] ; } cout << endl ; } return 0 ; }
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