Submission #556081

#	Time	Username	Problem	Language	Result	Execution time	Memory
556081		alextodoran	Snowball (JOI21_ho_t2)	C++17	100 / 100	128 ms	16888 KiB

Main

/**
 ____ ____ ____ ____ ____
||a |||t |||o |||d |||o ||
||__|||__|||__|||__|||__||
|/__\|/__\|/__\|/__\|/__\|

**/

#include <bits/stdc++.h>

using namespace std;

typedef long long ll;

const int N_MAX = 200000;
const int Q_MAX = 200000;

int N, Q;
ll X[N_MAX + 2];
ll W[Q_MAX + 2];

ll tr[Q_MAX + 2];
ll mxl[Q_MAX + 2];
ll mxr[Q_MAX + 2];

ll answer[N_MAX + 2];

int main () {
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);

    cin >> N >> Q;
    for (int i = 1; i <= N; i++) {
        cin >> X[i];
    }
    for (int q = 1; q <= Q; q++) {
        cin >> W[q];
    }

    for (int q = 1; q <= Q; q++) {
        tr[q] = tr[q - 1] + W[q];
        mxl[q] = max(mxl[q - 1], -tr[q]);
        mxr[q] = max(mxr[q - 1], +tr[q]);
    }

    for (int i = 1; i + 1 <= N; i++) {
        int l = 0, r = Q;
        while (l < r) {
            int mid = (l + r + 1) / 2;
            if (mxl[mid] + mxr[mid] < X[i + 1] - X[i]) {
                l = mid;
            } else {
                r = mid - 1;
            }
        }
        int join = l + 1;
        answer[i] += mxr[join - 1];
        answer[i + 1] += mxl[join - 1];
        if (join <= Q) {
            answer[(W[join] > 0 ? i : i + 1)] += (X[i + 1] - X[i]) - (mxl[join - 1] + mxr[join - 1]);
        }
    }
    answer[1] += mxl[Q];
    answer[N] += mxr[Q];

    for (int i = 1; i <= N; i++) {
        cout << answer[i] << "\n";
    }

    return 0;
}

• Subtask 1: 33 / 33
• Subtask 2: 67 / 67