Submission #632390

#	Time	Username	Problem	Language	Result	Execution time	Memory
632390		Ooops_sorry	Sandcastle 2 (JOI22_ho_t5)	C++14	9 / 100	40 ms	14804 KiB

Main

#include<bits/stdc++.h>

using namespace std;

mt19937 rnd(51);

#define ll long long
#define pb push_back
#define ld long double

int n, m, INF;

vector<vector<int>> a, any;
vector<pair<int,int>> d{{-1, 0}, {0, 1}, {1, 0}, {0, -1}};
vector<bool> used(4);
vector<vector<vector<int>>> side, two;

bool check(int i, int j) {
    return i >= 0 && i < n && j >= 0 && j < m;
}

int get_max(int i, int j, vector<int> ban = {}) {
    int mx = -1;
    for (auto to : ban) {
        used[to] = 1;
    }
    for (int k = 0; k < 4; k++) {
        if (used[k]) {
            continue;
        }
        int x = i + d[k].first, y = j + d[k].second;
        if (check(x, y) && a[x][y] < a[i][j]) {
            mx = max(mx, a[x][y]);
        }
    }
    for (auto to : ban) {
        used[to] = 0;
    }
    return (mx == -1 ? 0 : a[i][j] - mx);
}

void build() {
    int h = max(n, m), w = min(n, m);
    a.resize(h);
    any.resize(h);
    side.resize(h);
    two.resize(h);
    for (int i = 0; i < h; i++) {
        a[i].resize(w);
        any[i].resize(w);
        side[i].resize(w);
        two[i].resize(w);
    }
    for (int i = 0; i < h; i++) {
        for (int j = 0; j < w; j++) {
            side[i][j].resize(4);
            two[i][j].resize(4);
        }
    }
}

// 0 -> U
// 1 -> R
// 2 -> D
// 3 -> L

signed main() {
#ifdef LOCAL
    freopen("input.txt", "r", stdin);
#endif // LOCAL
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cin >> n >> m;
    INF = n * m;
    build();
    if (n < m) {
        swap(n, m);
        for (int j = 0; j < m; j++) {
            for (int i = 0; i < n; i++) {
                cin >> a[i][j];
            }
        }
    } else {
        for (int i = 0; i < n; i++) {
            for (int j = 0; j < m; j++) {
                cin >> a[i][j];
            }
        }
    }
    ll ans = 0;
    for (int i = 0; i < n; i++) {
        for (int j = 0; j < m; j++) {
            any[i][j] = get_max(i, j);
            for (int k = 0; k < 4; k++) {
                side[i][j][k] = get_max(i, j, {k});
                two[i][j][k] = get_max(i, j, {k, (k + 1) % 4});
            }
        }
    }
    for (int i = 0; i < n; i++) {
        int last = 2, cnt = 0;
        for (int j = 1; j < m; j++) {
            if ((last ^ (a[i][j - 1] < a[i][j])) == 1) {
                ans += 1ll * cnt * (cnt + 1) / 2;
                cnt = 1;
            } else {
                cnt++;
            }
            last = (a[i][j - 1] < a[i][j]);
        }
        ans += 1ll * cnt * (cnt + 1) / 2;
    }
    for (int j = 0; j < m; j++) {
        int last = 2, cnt = 0;
        for (int i = 1; i < n; i++) {
            if ((last ^ (a[i - 1][j] < a[i][j])) == 1) {
                ans += 1ll * cnt * (cnt + 1) / 2;
                cnt = 1;
            } else {
                cnt++;
            }
            last = (a[i - 1][j] < a[i][j]);
        }
        ans += 1ll * cnt * (cnt + 1) / 2;
    }
    ans += n * m;
    cout << ans << endl;
    return 0;
}

• Subtask 1: 9 / 9
• Subtask 2: 0 / 10
• Subtask 3: 0 / 5
• Subtask 4: 0 / 56
• Subtask 5: 0 / 20