poj2209

题意比较难理解，第二个数字是指数，从数列中选择任意多个，使得他们每个求幂再求和最大。

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      #include 
    
      <
    
      iostream
    
      >
    
      
#include 
    
      <
    
      cstdio
    
      >
    
      
#include 
    
      <
    
      cstdlib
    
      >
    
      
#include 
    
      <
    
      cstring
    
      >
    
      
#include 
    
      <
    
      cmath
    
      >
    
      

    
      using
    
       
    
      namespace
    
       std;


    
      int
    
       main()
{
 
    
      //
    
      freopen("t.txt", "r", stdin);
    
      

    
       
    
      int
    
       n, p;
 scanf(
    
      "
    
      %d%d
    
      "
    
      , 
    
      &
    
      n, 
    
      &
    
      p);
 
    
      int
    
       ans 
    
      =
    
       
    
      0
    
      ;
 
    
      for
    
       (
    
      int
    
       i 
    
      =
    
       
    
      0
    
      ; i 
    
      <
    
       n; i
    
      ++
    
      )
 {
 
    
      int
    
       a;
 scanf(
    
      "
    
      %d
    
      "
    
      , 
    
      &
    
      a);
 a 
    
      =
    
       pow(a, p);
 
    
      if
    
       (a 
    
      >
    
       
    
      0
    
      )
 ans 
    
      +=
    
       a;
 }
 printf(
    
      "
    
      %d\n
    
      "
    
      , ans);
 
    
      return
    
       
    
      0
    
      ;
}