poj1674

简单题

View Code

   
     

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

    
      using
    
       
    
      namespace
    
       std;


    
      #define
    
       maxn 10005
    
      


    
      int
    
       a[maxn];

    
      int
    
       cnt, n;


    
      int
    
       findit()
{
 
    
      for
    
       (
    
      int
    
       i 
    
      =
    
       
    
      1
    
      ; i 
    
      <=
    
       n; i
    
      ++
    
      )
 
    
      if
    
       (a[i] 
    
      !=
    
       i)
 
    
      return
    
       i;
 
    
      return
    
       
    
      -
    
      1
    
      ;
}


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

    
       
    
      int
    
       t;
 scanf(
    
      "
    
      %d
    
      "
    
      , 
    
      &
    
      t);
 
    
      while
    
       (t
    
      --
    
      )
 {
 scanf(
    
      "
    
      %d
    
      "
    
      , 
    
      &
    
      n);
 
    
      for
    
       (
    
      int
    
       i 
    
      =
    
       
    
      1
    
      ; i 
    
      <=
    
       n; i
    
      ++
    
      )
 scanf(
    
      "
    
      %d
    
      "
    
      , 
    
      &
    
      a[i]);
 cnt 
    
      =
    
       
    
      0
    
      ;
 
    
      int
    
       temp 
    
      =
    
       
    
      1
    
      ;
 
    
      while
    
       (
    
      1
    
      )
 {
 
    
      if
    
       (a[temp] 
    
      ==
    
       temp)
 temp 
    
      =
    
       findit();
 
    
      if
    
       (temp 
    
      ==
    
       
    
      -
    
      1
    
      )
 
    
      break
    
      ;
 swap(a[temp], a[a[temp]]);
 cnt
    
      ++
    
      ;
 }
 printf(
    
      "
    
      %d\n
    
      "
    
      , cnt);
 }
 
    
      return
    
       
    
      0
    
      ;
}