Contest3145 - the 37th game of 2021 freshman individual training match_ H: Eat fish

//
#include<bits/stdc++.h>
using namespace std;

const int N=33333;
const int V=66666;

int fish1[N],fish2[N];
int temp1,temp2,cnt1,cnt2,ans;

void init()
{
    temp1=temp2=cnt1=cnt2=ans=0;
    memset( fish1,0,sizeof( fish1 ) );
    memset( fish2,0,sizeof( fish2 ) );
}

bool cmp( int a,int b )
{
    return a>b ;
}

int main()
{
    int n,v,x,y,i;

    while( ~scanf("%d%d",&n,&v) )
    {
        init();
        for( i=0;i<n;i++ )
        {
            scanf("%d%d",&x,&y);
            if( x==1 )      fish1[cnt1++]=y;
            else if( x==2 ) fish2[cnt2++]=y;
        }
        sort( fish1,fish1+cnt1,cmp );       // cnt1
        sort( fish2,fish2+cnt2,cmp );

        while( temp2<cnt2 )                 // fish2  fill 
        {                       
            if( 2*(temp2+1)<=v ) ans+=fish2[temp2++];   // <=  Predetermination out of bounds 
            else                 break;
        }
        // temp2--;                         //  here  temp2  For quantity   No reduction 

        while( temp1+2*temp2<v )            // fish1  fill   Be careful not to take =
        {
            ans+=fish1[temp1++];
        }
        temp2--;             //  next  while  in  temp2  Subscript subscript   Need to get  (  It can also be used below  temp2-1 )

        while( temp1<cnt1 )
        {
            if( fish2[temp2]<fish1[temp1]+fish1[temp1+1] )      //  <=
            {
                ans+=( fish1[temp1]+fish1[temp1+1]-fish2[temp2] );    
                temp1+=2; temp2--;
            }
            else break;                     //  Prevent falling into a dead cycle 
        }
        printf("%d\n",ans);
    }
    return 0;
}

//
find:
01 sort  use  cnt  Sort 
02  First use  fish2  fill  

    1->2 false  Last remaining 1 What do I do ? 
    2->1 true

03  fill  fish1  Be careful not to take =
04 <=  Predetermination out of bounds 
05 temp  Don't confuse the meaning 

    01  Number 
    02  Subscript 

06  Deal with details 

    01 6e4*3e4==1.8e9  It's too big  dp Overtime  // k1 k2  Not initialized   Compile error 
    02 1->2  more than  1  Not good treatment   use  2—>1
    03  The fish are not full even if they are all loaded   What do I do ? cnt  Count the remaining