Submission #1059847

#	Time	Username	Problem	Language	Result	Execution time	Memory
1059847		tolbi	Closing Time (IOI23_closing)	C++17	9 / 100	1098 ms	9808 KiB

closing

#include "closing.h"

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

int max_score(int N, int X, int Y, long long K,
  std::vector<int> U, std::vector<int> V, std::vector<int> W)
{
    vector<long long> dp1(N);
    vector<long long> dp2(N);
    vector<long long> dp3(N);
    long long cur = 0;
    for (int i = X-1; i >= 0; i--){
        cur+=W[i];
        dp1[i]=cur;
    }
    cur=0;
    for (int i = X+1; i < N; i++){
        cur+=W[i-1];
        dp1[i]=cur;
    }

    cur = 0;
    for (int i = Y-1; i >= 0; i--){
        cur+=W[i];
        dp2[i]=cur;
    }
    cur=0;
    for (int i = Y+1; i < N; i++){
        cur+=W[i-1];
        dp2[i]=cur;
    }
    for (int i = 0; i < N; i++){
        dp3[i]=max(dp1[i],dp2[i]);
        if (i) dp3[i]+=dp3[i-1];
        if (i) dp2[i]+=dp2[i-1];
        if (i) dp1[i]+=dp1[i-1];
    }
    int ans = 0;
    function<long long(int,int,int)> query = [&](int ty, int l, int r)->long long{
        if (l>r) return 0;
        long long hh = 0;
        if (ty==2){
            hh = dp2[r];
            if (l) hh-=dp2[l-1];
        }
        else if (ty==3){
            hh = dp3[r];
            if (l) hh-=dp3[l-1];
        }
        else {
            hh = dp1[r];
            if (l) hh-=dp1[l-1];
        }
        return hh;
    };
    function<long long(int,int,int,int)> calc = [&](int al, int ar, int bl, int br)->long long{
        if (max(al,bl)<=min(ar,br)){
            long long ret = query(3,max(al,bl),min(ar,br));
            ret+=query(1,al,max(al,bl)-1);
            ret+=query(1,min(ar,br)+1,ar);
            ret+=query(2,bl,max(al,bl)-1);
            ret+=query(2,min(ar,br)+1,br);
            return ret;
        }
        else {
            return query(1,al,ar)+query(2,bl,br);
        }
    };
    for (int al = 0; al <= X; al++){
        for (int ar = X; ar < N; ar++){
            for (int bl = 0; bl <= Y; bl++){
                if (calc(al,ar,bl,Y)>K) continue;
                int l = Y, r = N-1;
                while (l<r){
                    int mid = l+(r-l+1)/2;
                    if (calc(al,ar,bl,mid)>K){
                        r=mid-1;
                    }
                    else l=mid;
                }
                ans=max(ans,ar-al+1+l-bl+1);
            }
        }
    }
    return ans;
}

• Subtask 0: 0 / 0
• Subtask 1: 0 / 8
• Subtask 2: 9 / 9
• Subtask 3: 0 / 12
• Subtask 4: 0 / 14
• Subtask 5: 0 / 9
• Subtask 6: 0 / 11
• Subtask 7: 0 / 10
• Subtask 8: 0 / 10
• Subtask 9: 0 / 17