Submission #1081916

#	Time	Username	Problem	Language	Result	Execution time	Memory
1081916		Boas	Closing Time (IOI23_closing)	C++17	9 / 100	1038 ms	35876 KiB

closing

#include "closing.h"

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
using namespace std;
using namespace __gnu_pbds;
template <typename T1, typename T2>
using indexed_map = tree<T1, T2, less<T1>, rb_tree_tag, tree_order_statistics_node_update>;

#define int long long
#define pb push_back
#define loop(x, i) for (int i = 0; i < x; i++)
#define rev(x, i) for (int i = (int)(x) - 1; i >= 0; i--)
#define ALL(x) begin(x), end(x)
typedef pair<int, int> ii;
typedef signed i32;
typedef vector<ii> vii;
typedef vector<int> vi;
typedef vector<i32> vi32;
typedef vector<bool> vb;
typedef vector<vi> vvi;
typedef vector<vii> vvii;

int sum(vi &pSum, int a, int b)
{
    int l = min(a, b), r = max(a, b);
    return pSum[r + 1] - pSum[l];
}

i32 max_score(i32 N, i32 X, i32 Y, int K, vi32 U, vi32 V, vi32 W)
{
    vvii adj(N);
    loop(N - 1, i)
    {
        adj[U[i]].pb({V[i], W[i]});
        adj[V[i]].pb({U[i], W[i]});
    }
    vi xTime(N), yTime(N);
    auto dfs = [&](auto &&self, int i, int prev, vi &time) -> void
    {
        for (auto [j, w] : adj[i])
        {
            if (j == prev)
                continue;
            time[j] = time[i] + w;
            self(self, j, i, time);
        }
    };
    dfs(dfs, X, X, xTime);
    dfs(dfs, Y, Y, yTime);
    vi maxTime(N);
    loop(N, i) maxTime[i] = max(xTime[i], yTime[i]);
    vi pSumX = {0}, pSumY = {0}, pSumMax = {0};
    loop(N, i)
    {
        pSumX.pb(pSumX.back() + xTime[i]);
        pSumY.pb(pSumY.back() + yTime[i]);
        pSumMax.pb(pSumMax.back() + maxTime[i]);
    }
    int res = 0;
    for (int lx = X; lx >= 0; lx--)
    {
        for (int rx = X; rx < N; rx++)
        {
            for (int ly = Y; ly >= 0; ly--)
            {
                int sumX = 0, sumY = 0, sumBoth = 0;
                if (rx >= ly)
                {
                    if (lx < ly)
                    {
                        sumX += sum(pSumX, lx, ly - 1);
                    }
                    if (rx < Y)
                    {
                        sumY += sum(pSumY, rx + 1, Y);
                    }
                    sumBoth += sum(pSumMax, ly, rx);
                }
                else
                {
                    sumX += sum(pSumX, lx, rx);
                    sumY += sum(pSumY, ly, Y);
                }
                int dis = sumX + sumY + sumBoth;
                int left = K - dis;
                if (left < 0)
                    continue;
                auto it = prev(upper_bound(ALL(pSumY), pSumY[max(Y, (i32)rx)] + left));
                int ry = (it - pSumY.begin()) - 1;
                int cnt = (rx - lx + 1) + (ry - ly + 1);
                res = max(res, cnt);
            }
        }
    }
    /*for (int both = 0; both < N; both++)
    {
        int best = 0, bestDis = INT_MAX;
        for (int i = X; i <= Y; i++)
        {
            int dis = sumDis(X, i) + sumDis(i, Y);
            if (dis < bestDis)
            {
                best = i;
                bestDis = dis;
            }
        }
    }*/
    return res;
}

• 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