Submission #1196291

#	Time	Username	Problem	Language	Result	Execution time	Memory
1196291		LGQ_A3K25	Cultivation (JOI17_cultivation)	C++20	80 / 100	2095 ms	3012 KiB

cultivation

#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define db double
#define gcd(a,b) __gcd(a,b)
#define lcm(a,b) a*b / __gcd(a,b)
#define I first
#define II second
#define pb push_back
#define ii pair<int,int>
const int INF = 2e9;
const int N = 1e3 + 1;
const int MOD = 1e9 + 7;
int n, m, k;
ll ans = 1e18;
namespace sub1
{
int a[41][41], b[41][41];
    int main()
    {
        vector<ii> s;
        for (int i = 0; i < k; i++)
        {
            int u, v; cin >> u >> v;
            s.pb({u, v});
            a[u][v] = 1;
        }
        int ans = INF;
        for (int x = 0; x <= 40; x++)
            for (int y = 0; y <= 40; y++)
                if (x + y <= ans)
        {
            for (int i = 1; i <= n; i++)
                for (int j = 1; j <= m; j++) b[i][j] = a[i][j];
            for (auto [u, v] : s)
            {
                int ox = 1, oy = 1;
                for (int i = 1; i <= max(x, y) && (ox | oy); i++)
                {
                    if (ox && i <= x)
                    {
                        if (u - i == 0 || b[u - i][v] == 1) ox = 0; else
                        b[u - i][v] = 1;
//                        if (x == 4 && y == 5) cout << u - i << ' ' << v << '\n';
                    }
                    if (oy && i <= y)
                    {
                        if (u + i == n + 1 || b[u + i][v] == 1) oy = 0; else
                        b[u + i][v] = 1;
                    }
                }
            }
//            if (x == 4 && y == 5)
//            {
//                for (int i = 1; i <= n; i++)
//                    for (int j = 1; j <= m; j++) cout << (b[i][j]) << (j == m ? '\n' : ' ');
//            }
            int l = 0, r = 0, mid = 0, ok = 1;
            for (int i = 1; i <= n; i++)
            {
                int last = 0, nxt = m + 1, ok1 = 0;
                for (int j = 1; j <= m; j++)
                {
                    if (b[i][j])
                    {
                        ok1 = 1;
                        if (!last) l = max(l, j - 1); else
                            mid = max(mid, j - last - 1);
                        last = j;
                    }
                    int jj = m - j + 1;
                    if (b[i][jj])
                    {
                        if (nxt == m + 1) r = max(r, nxt - jj - 1); else
                            mid = max(mid, nxt - jj - 1);
                        nxt = jj;
                    }
                }
                if (!ok1)
                {
                    ok = 0;
                    break;
                }
            }
            if (ok)
            {
                mid = max(0, mid - l - r);
                ans = min(ans, x + y + l + r + mid);
            }
//            if (ans == 8) cout << x << ' ' << y << '\n';
        }
        cout << ans;
        return 0;
    }
}
namespace sub2
{
int a[41][41];
    bool cmp(ii x, ii y)
    {
        if (x.II < y.II) return true; else
            if (x.II == y.II) return x.I < y.I;
        return false;
    }
    int main()
    {
        vector<ii> s;
        for (int i = 1; i <= k; i++)
        {
            int u, v;
            cin >> u >> v;
            s.pb({u, v});
        }
        sort(s.begin(), s.end(), cmp);
        int ans = INF;
        for (int tt = 0; tt < k; tt++)
        {
            int x = s[tt].I - 1;
            vector<int> t;
            for (int i = 0; i < k; i++)
            {
                for (int j = 0; j < k; j++) t.pb(max(0, s[j].I - x - s[i].I - 1));
                t.pb(n - s[i].I);
            }
            sort(t.begin(), t.end());
            t.resize(unique(t.begin(), t.end()) - t.begin());
            for (auto y : t)
            {
//                if (x == 0 && y == 4) cout << "fwefwef" << '\n';
                if (x + y > ans) break;
    //            cout << x << ' ' << y << '\n';
                int cur = x + y;
                vector<array<int, 3> > p;
                vector<array<int, 2> > b;
                for (auto [u, v] : s)
                {
                    int l = max(1, u - x), r = min(n, u + y);
                    b.pb({l, r});
                    p.pb({v, l, r});
                }
                sort(b.begin(), b.end());
                if (b[0][0] != 1) continue;
                int R = b[0][1], ok = 1;
                for (int i = 1; i < k; i++)
                {
                    if (b[i][0] > R + 1)
                    {
                        ok = 0;
                        break;
                    } else R = b[i][1];
                }
                if (!ok || R != n) continue;
                int l = 0, r = 0, mid = 0;
                for (int i = 0; i < k; i++)
                {
                    int u = p[i][1], v = p[i][2];
                    for (int j = 0; j < i && (u <= v); j++)
                    {
                        int c = p[j][1], d = p[j][2];
                        if (c <= u && d >= u)
                        {
                            mid = max(mid, p[j][0] - p[i][0] - 1);
                            u = d + 1;
                        } else
                        if (c <= v && d >= v)
                        {
                            mid = max(mid, p[j][0] - p[i][0] - 1);
                            v = c - 1;
                        }
                    }
                    if (u <= v) l = max(l, p[i][0] - 1);
                }
                for (int i = k - 1; i >= 0; i--)
                {
                    int u = p[i][1], v = p[i][2];
                    for (int j = i + 1; j < k && (u <= v); j++)
                    {
                        int c = p[j][1], d = p[j][2];
                        if (c <= u && d >= u)
                        {
                            mid = max(mid, p[j][0] - p[i][0] - 1);
                            u = d + 1;
                        } else
                        if (c <= v && d >= v)
                        {
                            mid = max(mid, p[j][0] - p[i][0] - 1);
                            v = c - 1;
                        }
                    }
//                    if (mid == 2 && !x && y == 4) cout << i << '\n';
                    if (u <= v) r = max(r, m - p[i][0]);
                }
                cur += l + r + max(0, mid - l - r);
//                if (x == 0 && y == 4) cout << l << ' ' << r << ' ' << mid << '\n';
                ans = min(ans, cur);
            }
        }
        cout << ans << '\n';
        return 0;
    }
}
namespace sub3
{
int tg[N], num[N];
ll ans = 1e18;
ii p[N];
array<int, 3> cur[N], f[N][N]; // L, R, M
struct DQ
{
    deque<ii> q;
    void add(ii x)
    {
        while (q.size() && q.back().I <= x.I) q.pop_back();
        q.pb(x);
    }
    void del(int x)
    {
        while (q.size() && q.front().II <= x) q.pop_front();
    }
    int get()
    {
        if (q.empty()) return INF; else
            return q.front().I;
    }
} L, R, M;
    void init()
    {
        for (int l = 1; l <= k; l++)
        {
            int sz = 0;
            for (int r = l; r <= k; r++)
            {
                int mx = p[r].II;
                for (int i = 1; i <= sz; i++)
                    if (mx < tg[i]) swap(tg[i], mx);
                tg[++sz] = mx;
                f[l][r][0] = tg[1] - 1;
                f[l][r][1] = m - tg[sz];
                for (int i = 1; i < sz; i++)
                    f[l][r][2] = max(f[l][r][2], tg[i + 1] - tg[i] - 1);
//                cout << l << ' ' << r << ' ' << f[l][r][0] << ' ' << f[l][r][1] << ' ' << f[l][r][2] << '\n';
            }
        }
    }
    void solve(int le)
    {
        int sz = 0;
        for (int l = 1, r = 1; l <= k; l++)
        {
            while (r <= k && p[r].I <= p[l].I + le)
            {
                int val = p[r++].I;
                if (val > num[sz]) num[++sz] = val;
            }
            if (p[l].I + le + 1 > num[sz]) num[++sz] = p[l].I + le + 1;
        }
        for (int i = 1, l = 1, r = 1; i <= sz; i++)
        {
            while (l <= k && !(p[l].I <= num[i] && num[i] <= p[l].I + le)) l++;
            r = max(r, l);
            while (r <= k && p[r].I <= num[i] && num[i] <= p[r].I + le) r++;
            if (l > k) cur[i] = {INF, INF, INF}; else
                cur[i] = f[l][r - 1];
        }
        for (int l = 1, r = 1; l <= sz; l++)
        {
            r = max(r, l);
            while (r <= sz && num[r] < num[l] + n)
            {
                L.add({cur[r][0], r});
                R.add({cur[r][1], r});
                M.add({cur[r][2], r++});
            }
//            cout << le << ' ' << L.get() << ' ' << R.get() << ' ' << M.get() << '\n';
            ans = min(ans, 1ll * le + 1ll * max(L.get() + R.get(), M.get()));
            L.del(l);
            R.del(l);
            M.del(l);
        }
    }
    int main()
    {
        for (int i = 1; i <= k; i++) cin >> p[i].I >> p[i].II;
        vector<int> t;
        sort(p + 1, p + k + 1);
        for (int i = 1; i <= k; i++)
        {
            t.pb(p[i].I - 1);
            t.pb(n - p[i].I);
            for (int j = 1; j <= k; j++)
            {
                t.pb(max(0, p[j].I - p[i].I - 1));
                t.pb(p[i].I - 1 + n - p[j].I);
            }
        }
        sort(t.begin(), t.end());
        t.resize(unique(t.begin(), t.end()) - t.begin());
//        for (auto c : t) cout << c << ' ';cout << '\n';
        init();
        for (auto l : t) solve(l);
        cout << ans;
        return 0;
    }
}
int32_t main()
{
#define TASKNAME ""
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    if (fopen(TASKNAME".inp","r" ))
    {
        freopen(TASKNAME".inp","r",stdin);
        freopen(TASKNAME".ans","w",stdout);
    }
    cin >> n >> m >> k;
//    if (max(n, m) <= 40) sub1 :: main(); else
//        if (k <= 25) sub2 :: main(); else
            sub3 :: main();
    return 0;
}

Compilation message (stderr)

cultivation.cpp: In function 'int32_t main()':
cultivation.cpp:312:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  312 |         freopen(TASKNAME".inp","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
cultivation.cpp:313:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  313 |         freopen(TASKNAME".ans","w",stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 5 / 5
• Subtask 2: 10 / 10
• Subtask 3: 15 / 15
• Subtask 4: 30 / 30
• Subtask 5: 20 / 20
• Subtask 6: 0 / 20