Submission #150079

#	Time	Username	Problem	Language	Result	Execution time	Memory
150079		20190901 (#200)	Crosses on the Grid (FXCUP4_cross)	C++17	0 / 100	282 ms	6760 KiB

cross

#include "cross.h"
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
pair<int, int> arr[200000];
int it[200000], ot[200000];
int n;

int update(int st[], int idx, int v, int p, int x, int y)
{
    if(idx<x || idx>y) return st[p];
    if(x==y) return st[p]=v;
    int mid=x+y>>1;
    return st[p]=min(update(st, idx, v, p<<1, x, mid), update(st, idx, v, (p<<1)+1, mid+1, y));
}

long long SelectCross(int K, std::vector<int> I, std::vector<int> O)
{
    n=I.size();
	memset(it, 0x3f3f3f3f, sizeof(it));
	memset(ot, 0x3f3f3f3f, sizeof(it));
    for(int i=0; i<n; i++)
    {
        arr[i]={O[i], I[i]};
    }

    sort(arr, arr+n);
    for(int i=0; i<K; i++)
    {
        update(ot, i, arr[i].first, 1, 0, n);
        update(it, i, arr[i].second, 1, 0, n);
    }

    ll ans=0;
    for(int i=0; i<n; i++)
    {
        int isize=it[1], osize=ot[1];
		
        ans=max(ans, ll(osize)*osize-ll(osize-isize)*(osize-isize));
		// cout<<ans<<' ';
        update(ot, i, 1e9, 1, 0, n);
        update(it, i, 1e9, 1, 0, n);
        update(ot, (i+K)%n, arr[(i+K)%n].first, 1, 0, n);
        update(it, (i+K)%n, arr[(i+K)%n].second, 1, 0, n);
    }

	return ans;
}

Compilation message (stderr)

cross.cpp: In function 'int update(int*, int, int, int, int, int)':
cross.cpp:13:14: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
     int mid=x+y>>1;
             ~^~

• Subtask 1: 0 / 8
• Subtask 2: 0 / 55
• Subtask 3: 0 / 37