Submission #1007319

#	Time	Username	Problem	Language	Result	Execution time	Memory
1007319		VMaksimoski008	Nafta (COI15_nafta)	C++17	34 / 100	1044 ms	111556 KiB

nafta

#include <bits/stdc++.h>

#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()
//#define int long long

using namespace std;

#pragma GCC optimize("O3,unroll-loops")
#pragma GCC target("avx,bmi,bmi2,lzcnt,popcnt")


using ll = long long;
using pii = pair<int, int>;
using pll = pair<ll, ll>;
using Comp = array<ll, 3>;

const int mod = 1e9 + 7;
const int LOG = 20;
const int maxn = 1e5 + 5;

struct SegTree {
    int n;
    vector<vector<pii> > tree, v;
    vector<vector<int> > suf;

    void init(vector<vector<pii> > &_c) {
        v = _c;
        n = v.size() - 1;
        suf.resize(4*n+10);
        tree.resize(4*n+10);
        build(1, 1, n);
    }

    void build(int u, int tl, int tr) {
        if(tl == tr) {
            tree[u] = v[tl];
            if(!tree[u].empty()) {
                suf[u].resize(tree[u].size());
                suf[u].back() = tree[u].back().second;
                for(int i=suf[u].size()-2; i>=0; i--) suf[u][i] = suf[u][i+1] + tree[u][i].second;
            }
        } else {
            int tm = (tl + tr) / 2;
            build(2*u, tl, tm);
            build(2*u+1, tm+1, tr);
            merge(all(tree[2*u]), all(tree[2*u+1]), back_inserter(tree[u]));
            if(!tree[u].empty()) {
                suf[u].resize(tree[u].size());
                suf[u].back() = tree[u].back().second;
                for(int i=suf[u].size()-2; i>=0; i--) suf[u][i] = suf[u][i+1] + tree[u][i].second;
            }
        }
    }

    int query(int u, int tl, int tr, int l, int r) {
        if(tl > tr || l > tr || tl > r) return 0;
        if(l <= tl && tr <= r) {
            if(tree[u].empty() || tree[u].back().first < r) return 0;
            auto p = lower_bound(tree[u].begin(), tree[u].end(), pii{ r, 0 }) - tree[u].begin();
            return suf[u][(int)p];
        }

        int tm = (tl + tr) / 2;
        return query(2*u, tl, tm, l, r) + query(2*u+1, tm+1, tr, l, r);
    }

    int query(int l, int r) { return query(1, 1, n, l, r); }
} tree;

int dr[8] = {0, -1, 0, 1, 1, 1, -1, -1};
int dc[8] = {-1, 0, 1, 0, 1, -1, 1, -1};
char mat[2005][2005];
bool vis[2005][2005];
int L=1e9, R=-1, sum=0, n, m;

void dfs(int r, int c) {
    vis[r][c] = 1;
    L = min(L, c); R = max(R, c);
    sum += (mat[r][c] - '0');

    for(int i=0; i<4; i++) {
        int newR = r + dr[i];
        int newC = c + dc[i];
        if(newR < 0 || newR >= n || newC < 0 || newC >= m) continue;
        if(vis[newR][newC] || mat[newR][newC] == '.') continue;
        dfs(newR, newC);
    }
}

int dp[2005][2005];

void f(int l, int r, int tl, int tr, int j) {
    if(l > r) return ;
    int tm = (l + r) / 2, p = tl;

    // if(j == 2) cout << l << " " << r << " " << tl << " " << tr << '\n';
    for(int i=tl; i<=min(tm, tr); i++) {
        // if(j == 2) cout << i << " " << tm << ": " << tree.query(i, tm) << '\n';
        ll v = dp[i-1][j-1] + tree.query(i, tm);
        if(v > dp[tm][j]) {
            dp[tm][j] = v;
            p = i;
        }
    }

    f(l, tm-1, tl, p, j);
    f(tm+1, r, p, tr, j);
}

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

    cin >> n >> m;
    for(int i=0; i<n; i++)
        for(int j=0; j<m; j++) cin >> mat[i][j];

    vector<vector<pii> > vec(m+1);
    for(int i=0; i<n; i++) {
        for(int j=0; j<m; j++) {
            if(vis[i][j] || mat[i][j] == '.') continue;
            L=1e9, R=-1, sum=0;
            dfs(i, j);
            vec[L+1].push_back({ R+1, sum });
        }
    }
    
    for(int i=1; i<=m; i++) sort(vec[i].begin(), vec[i].end());
    tree.init(vec);

    for(int i=1; i<=m; i++) {
        f(1, m, 1, m, i);
        int mx = 0;
        for(int j=1; j<=m; j++) mx = max(mx, dp[j][i]);
        cout << mx << '\n';
    }
    return 0;
}

• Subtask 1: 11 / 11
• Subtask 2: 23 / 23
• Subtask 3: 0 / 66