2019 cattle off more school training camp third Replenishment

 

B题：Crazy Binary String

To 0 as -1, and the prefix, pos [0 + n] = 0

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

const int maxn = 1e5+3;
int a[maxn]; 
int pos[maxn<<1];
string s;

int main(){
    ios::sync_with_stdio(false);
    int n;
    cin>>n>>s;
    for(int i=0; i<n; i++){
        if(s[i]=='0') a[i] = a[i-1] -1;
        elseA [I] = A [I- . 1 ] + . 1 ; 
    } 
    for ( int I = 0 ; I <= 2 * n-; I ++ ) { 
        POS [I] = - . 1 ; 
    } 
    POS [ 0 + n-] = 0 ;   // Note that this is not a simple but 0 + n-0 
    int ANS = 0 ;
     for ( int I = 0 ; I <n-; I ++ ) {
         IF (! POS [n-+ a [I]] = - . 1 ) 
            ANS = max (ANS, I-POS [n-+ A [I]]);
         the else {
            pos[ n+a[i] ] = i;
        }
    }
    cout<<ans<<" ";
    int zero=0;
    for(int i=0; i<n; i++){
        zero += s[i]=='0'; 
    }
    cout<<( min(zero,n-zero)<<1 )<<endl;
}

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H题： Magic Line

Sorting, find n / 2 points and the n / 2 + 1 point

#include<cstdio>
#include<iostream>
#include<algorithm>
using namespace std;
const int maxn=20000;
const int M=900000009;
struct Point{
    int x,y;
}po[maxn];
bool cmp(Point a,Point b){
    if(a.x!=b.x) return a.x<b.x;
    else return a.y<b.y;
}
int main(){
    int T,n;
    scanf("%d",&T);
    while(T--){
        scanf("%d",&n);
        for(int i=1;i<=n;i++){
            scanf("%d%d",&po[i].x,&po[i].y);
        }
        sort(po+1,po+1+n,cmp);
        if(po[n/2].x!=po[n/2+1].x) printf("%d %d %d %d\n",po[n/2].x,M,po[n/2+1],-M);
        else printf("%d %d %d %d\n",po[n/2].x-1,po[n/2+1].y+M,po[n/2].x+1,po[n/2].y-M);
    }
}

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