oj.uz

Submission #328417

# Submission time Handle Problem Language Result Execution time Memory
328417 2020-11-16T13:04:36 Z dolphingarlic Nafta (COI15_nafta) C++14
34 / 100
 705 ms 20460 KB 
#include <bits/stdc++.h>
typedef long long ll;
using namespace std;

int n, m;
char grid[2001][2001];
bool visited[2001][2001];
int dx[4]{1, -1, 0, 0}, dy[4]{0, 0, 1, -1};
int dp[2001], segtree[8001], lazy[8001];

bool inside(int x, int y) {
    return x && y && x <= n && y <= m && !visited[x][y] && grid[x][y] != '.';
}

tuple<int, int, int> get_oil(int x, int y) {
    tuple<int, int, int> ret = {y, y, grid[x][y] - '0'};
    visited[x][y] = true;
    for (int i = 0; i < 4; i++) if (inside(x + dx[i], y + dy[i])) {
        tuple<int, int, int> pot = get_oil(x + dx[i], y + dy[i]);
        get<0>(ret) = min(get<0>(ret), get<0>(pot));
        get<1>(ret) = max(get<1>(ret), get<1>(pot));
        get<2>(ret) += get<2>(pot);
    }
    return ret;
}

void push_lazy(int node, int l, int r) {
    segtree[node] += lazy[node];
    if (l != r) {
        lazy[node * 2] += lazy[node];
        lazy[node * 2 + 1] += lazy[node];
    }
    lazy[node] = 0;
}

void build(int node = 1, int l = 0, int r = m) {
    lazy[node] = 0;
    if (l == r) segtree[node] = dp[l];
    else {
        int mid = (l + r) / 2;
        build(node * 2, l, mid);
        build(node * 2 + 1, mid + 1, r);
        segtree[node] = max(segtree[node * 2], segtree[node * 2 + 1]);
    }
}

int query(int pos, int node = 1, int l = 0, int r = m) {
    if (lazy[node]) push_lazy(node, l, r);
    if (l > pos) return 0;
    if (r <= pos) return segtree[node];
    int mid = (l + r) / 2;
    return max(query(pos, node * 2, l, mid), query(pos, node * 2 + 1, mid + 1, r));
}

void update(int pos, int val, int node = 1, int l = 0, int r = m) {
    if (lazy[node]) push_lazy(node, l, r);
    if (l > pos) return;
    if (r <= pos) {
        lazy[node] = val;
        push_lazy(node, l, r);
    } else {
        int mid = (l + r) / 2;
        update(pos, val, node * 2, l, mid);
        update(pos, val, node * 2 + 1, mid + 1, r);
        segtree[node] = max(segtree[node * 2], segtree[node * 2 + 1]);
    }
}

int main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cin >> n >> m;
    for (int i = 1; i <= n; i++) for (int j = 1; j <= m; j++) {
        cin >> grid[i][j];
    }
    vector<tuple<int, int, int>> oil;
    for (int i = 1; i <= n; i++) for (int j = 1; j <= m; j++) {
        if (inside(i, j)) {
            int l, r, val;
            tie(l, r, val) = get_oil(i, j);
            oil.push_back({l, l, val});
            oil.push_back({r + 1, l, -val});
        }
    }
    sort(oil.begin(), oil.end());

    if (n > 300) return 0;

    for (int _ = 1; _ <= m; _++) {
        memset(dp, 0, sizeof dp);
        for (int i = _, ptr = 0; i <= m; i++) {
            while (get<0>(oil[ptr]) <= i) {
                update(get<1>(oil[ptr]) - 1, get<2>(oil[ptr]));
                ptr++;
            }
            dp[i] = query(i - 1);
        }
        build();
        cout << query(m) << '\n';
    }
    return 0;
}

Subtask #1
11.0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 620 KB Output is correct
2 Correct 2 ms 620 KB Output is correct
3 Correct 1 ms 620 KB Output is correct
4 Correct 4 ms 620 KB Output is correct
5 Correct 2 ms 620 KB Output is correct
6 Correct 1 ms 620 KB Output is correct

Subtask #2
23.0 / 23.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 620 KB Output is correct
2 Correct 2 ms 620 KB Output is correct
3 Correct 1 ms 620 KB Output is correct
4 Correct 4 ms 620 KB Output is correct
5 Correct 2 ms 620 KB Output is correct
6 Correct 1 ms 620 KB Output is correct
7 Correct 705 ms 1896 KB Output is correct
8 Correct 376 ms 1836 KB Output is correct
9 Correct 52 ms 3564 KB Output is correct
10 Correct 452 ms 1836 KB Output is correct
11 Correct 137 ms 1644 KB Output is correct
12 Correct 63 ms 1772 KB Output is correct

Subtask #3
0 / 66.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 620 KB Output is correct
2 Correct 2 ms 620 KB Output is correct
3 Correct 1 ms 620 KB Output is correct
4 Correct 4 ms 620 KB Output is correct
5 Correct 2 ms 620 KB Output is correct
6 Correct 1 ms 620 KB Output is correct
7 Correct 705 ms 1896 KB Output is correct
8 Correct 376 ms 1836 KB Output is correct
9 Correct 52 ms 3564 KB Output is correct
10 Correct 452 ms 1836 KB Output is correct
11 Correct 137 ms 1644 KB Output is correct
12 Correct 63 ms 1772 KB Output is correct
13 Incorrect 246 ms 20460 KB Output isn't correct
14 Halted 0 ms 0 KB -