HDOJ 1160

http://acm.hdu.edu.cn/showproblem.php?pid=1160

 

题目是最长有序序列

关键代码思路  ,要注意开始都要赋值1,或者结果+1

for  i:=1 to n do

for j:=0 to i-1 do

if ( a[j]>a[i]) and (opt[j]+1>opt[i]) then

opt[i]:=opt[j]+1;

 

#include <iostream>
 #include <algorithm>
 #include <stack>
 #define MAX 1000
 using namespace std;
 struct mice
 {
     int index;
     int weight;
     int speed;
 };
 mice mices[MAX+1];
 int f[MAX+1];
 int flag[MAX+1];
 bool cmp(const mice mice1,const mice mice2)
 {
     if(mice1.weight!=mice2.weight)
     {
         return  mice1.weight < mice2.weight;
     }
     else
     {
         return mice1.speed>mice2.speed;
     }
 
 }
 int main()
 {
     int w,s;
     stack <int> stk;
     int cnt=1;
     f[1]=1;
     flag[1]=1;
     //input
     while(cin>>w>>s)
     {
         mices[cnt].index = cnt;
         mices[cnt].weight =w;
         mices[cnt].speed =s;
         cnt++;
     }
     //sort
     sort(mices+1,mices+cnt,cmp);
 
     //dp
     for(int i=2;i<cnt;i++)
     {
         int maxTemp;
         int temp=0;
         for(int j=1;j<i;j++)
         {
             if(mices[i].weight>mices[j].weight&& mices[i].speed<mices[j].speed)
             {
                 if(temp<f[j])
                 {
                     temp = f[j];
                     flag[i]=j;
                 }
             }
         }
         f[i]=temp+1;
     }
     int max=-1;
     int maxi;
     for(int i=1;i<cnt;i++)
     {
         if(f[i]>max)
         {
             max = f[i];
             maxi = i;
         }
     }
     cout<<max<<endl;
     for(int i=0;i<max;i++)
     {
         int j=maxi;
         stk.push(mices[j].index);
         maxi = flag[j];
     }
     while(!stk.empty())
     {
         cout<<stk.top()<<endl;
         stk.pop();
     }
     return 0;
 }

 

 

自己用C语言AC的,代码太长了,上面的代码是别人C++AC的。感觉C++的模板确实好用些~排序sort函数和堆栈操作,以后要练习使用C++来AC题目。C++的输入输出也很爽的~

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