제출 #647192

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
647192		danikoynov	Nafta (COI15_nafta)	C++14	100 / 100	550 ms	57628 KiB

nafta

/**
 ____ ____ ____ ____ ____ ____
||l |||e |||i |||n |||a |||d ||
||__|||__|||__|||__|||__|||__||
|/__\|/__\|/__\|/__\|/__\|/__\|

**/

#include<bits/stdc++.h>
#define endl '\n'

using namespace std;
typedef long long ll;

void speed()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);
}

struct cell
{
    int x, y;

    cell(int _x = 0, int _y = 0)
    {
        x = _x;
        y = _y;
    }

    cell operator + (const cell & c) const
    {
        cell r;
        r.x = x + c.x;
        r.y = y + c.y;
        return r;
    }
};

cell neib[4] = {{0, 1}, {1, 0}, {-1, 0}, {0, -1}};

const int maxn = 2010;
int n, m, sum[maxn * maxn], used[maxn][maxn];
int lm[maxn * maxn], rm[maxn * maxn], met[maxn * maxn];
char c[maxn][maxn];
void bfs(int i, int j)
{
    cell st(i, j);
    queue < cell > q;
    q.push(st);
    while(!q.empty())
    {
        st = q.front();
        q.pop();
        for (int i = 0; i < 4; i ++)
        {
            cell nb = st + neib[i];
            if (!used[nb.x][nb.y])
            {
                used[nb.x][nb.y] = used[st.x][st.y];
                q.push(nb);
            }
        }
    }
}

int cost[maxn][maxn], df[maxn], dp[maxn][maxn], row;

void divide(int l, int r, int optl, int optr)
{
    if (l > r)
        return;

    int opt = -1, mid = (l + r) / 2, f = -1e9;
    for (int i = optl; i <= min(optr, mid); i ++)
    {
        if (dp[row - 1][i] + cost[i][mid] > f)
        {
            f = dp[row - 1][i] + cost[i][mid];
            opt = i;
        }
    }

    dp[row][mid] = f;
    divide(l, mid - 1, optl, opt);
    divide(mid + 1, r, opt, optr);
}

void solve()
{
    cin >> n >> m;
    for (int i = 1; i <= n; i ++)
        for (int j = 1; j <= m; j ++)
        {
            cin >> c[i][j];
            if (c[i][j] == '.')
                used[i][j] = 1;
        }

    for (int i = 0; i <= n + 1; i ++)
        used[i][0] = used[i][m + 1] = 1;

    for (int j = 0; j <= m + 1; j ++)
        used[0][j] = used[n + 1][j] = 1;

    int cnt = 0;
    for (int i = 1; i <= n; i ++)
        for (int j = 1; j <= m; j ++)
        {
            if (!used[i][j])
            {
                cnt ++;
                used[i][j] = cnt;
                bfs(i, j);
            }
        }

    for (int i = 1; i <= cnt; i ++)
        lm[i] = m + 1, rm[i] = 0;

    for (int i = 1; i <= n; i ++)
        for (int j = 1; j <= m; j ++)
        {
            if (c[i][j] == '.')
            {
                used[i][j] = 0;
                continue;
            }
            sum[used[i][j]] += (int)(c[i][j] - '0');
            lm[used[i][j]] = min(lm[used[i][j]], j);
            rm[used[i][j]] = max(rm[used[i][j]], j);
        }



    for (int j = 1; j <= m; j ++)
    {
        int cur = 0;
        for (int i = 1; i <= n; i ++)
        {
            if (!met[used[i][j]])
            {
                met[used[i][j]] = 1;
                df[rm[used[i][j]]] += sum[used[i][j]];

                cur += sum[used[i][j]];
            }

        }

        for (int i = 1; i <= n; i ++)
            met[used[i][j]] = 0;
        for (int j1 = 0; j1 < j; j1 ++)
            cost[j1][j] += cur;

        int to_rem = cur - df[j];
        for (int j1 = j + 1; j1 <= m; j1 ++)
        {
            cost[j][j1] -= to_rem;
            to_rem -= df[j1];

        }

        for (int j1 = 1; j1 <= m; j1 ++)
            df[j1] = 0;
    }



    for (int j = 1; j <= m; j ++)
    {
        row = j;
        divide(1, n, 0, n);
        for (int i = 1; i <= n; i ++)
            dp[j][i] = max(dp[j][i], dp[j][i - 1]);
    }

    for (int j = 1; j <= m; j ++)
        cout << dp[j][n] << endl;




}

int main()
{
    solve();
    return 0;
}

• Subtask 1: 11 / 11
• Subtask 2: 23 / 23
• Subtask 3: 66 / 66