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  1. #include<bits/stdc++.h>
  2. using namespace std ;
  3. int a[105] , n , k , dp[105][10][105] ;
  4. int addbtoa ( int a , int b ) {
  5.     int x = a , y = b ; while ( y ) { x *= 10 ; y /= 10 ; } x += b ; return x ;
  6. }
  7. bool cmp ( int a , int b ) {
  8.     int x , q ;
  9.     x = addbtoa ( a , b ) ;
  10.     q = addbtoa ( b , a ) ;
  11.     return x > q ;
  12. }
  13. int find_ans ( int index , int mask , int taken , int sett[] , int val ) {
  14.     if ( taken == k ) {
  15.         if ( !mask )
  16.             return val ;
  17.         return -1 ;
  18.     }
  19.     int ans1 , ans2 ;
  20.     if ( index == n )
  21.         return -1 ;
  22.     if ( dp[index][mask][taken] != -1 )
  23.         return dp[index][mask][taken] ;
  24.     sett[index] = 0 ;
  25.     ans1 = find_ans ( index+1 , mask , taken , sett , val ) ;
  26.     sett[index] = 1 ;
  27.     ans2 = find_ans ( index+1 , (mask+a[index])%9 , taken+1 , sett , addbtoa( val , a[index]) ) ;
  28.     sett[index] = 0 ;
  29.     dp[index][mask][taken] = max ( ans1 , ans2 ) ;
  30.     return max ( ans1 , ans2 ) ;
  31. }
  32. int main () {
  33.     int t ; scanf ( "%d" , &t ) ;
  34.     while ( t-- ) {
  35.         scanf ( "%d %d" , &n , &k ) ;
  36.         for ( int i = 0 ; i < n ; i++ ) {
  37.             scanf ( "%d" , &a[i] ) ;
  38.         }
  39.         sort ( a , a+n , cmp ) ;
  40.         memset ( dp , -1 , sizeof ( dp ) ) ;
  41.         int sett[105] = {0} ;
  42.         int ans = find_ans ( 0 , 0 , 0 , sett , 0 ) ;
  43.         printf ( "%d\n" , ans )  ;
  44.     }
  45.     return 0 ;
  46. }
  47.  
Runtime error #stdin #stdout 1.28s 3904KB
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https://ideone.com/faMyky
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
public

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