Submission #995269

#	Time	Username	Problem	Language	Result	Execution time	Memory
995269		gmroh06	The Kingdom of JOIOI (JOI17_joioi)	C++14	100 / 100	718 ms	61308 KiB

joioi

#include <bits/stdc++.h>

using namespace std;
using ll = long long;
using pll = pair<ll, ll>;
using tll = tuple<ll, ll, ll, ll>;

inline void fastio() {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    cout.tie(nullptr);
}

const ll INF = 1e18;

ll h, w, mn = INF, mx, ans = INF;
vector<vector<ll>> v;

bool chk(ll val) {
    for (ll i = 0, tmp = 0; i < h; i++) {
        for (ll j = 0; j < w; j++) if (v[i][j] + val < mx) {
            tmp = max(tmp, j + 1);
        }

        for (ll j = 0; j < w; j++) if (v[i][j] > mn + val and j < tmp) {
            return false;
        }
    }

    return true;
}

ll cal() {
    ll s = 0, e = mx - mn;

    while (s < e) {
        ll mid = (s + e) / 2;

        if (chk(mid)) {
            e = mid;
        } else {
            s = mid + 1;
        }
    }

    return s;
}

int main() {
    fastio();

    cin >> h >> w;

    v.resize(h, vector<ll>(w));

    for (ll i = 0; i < h; i++) for (ll j = 0; j < w; j++) {
        cin >> v[i][j];

        mx = max(v[i][j], mx);
        mn = min(v[i][j], mn);
    }

    ans = min(ans, cal());

    reverse(v.begin(), v.end());

    ans = min(ans, cal());

    for (auto& x : v) {
        reverse(x.begin(), x.end());
    }

    ans = min(ans, cal());

    reverse(v.begin(), v.end());

    ans = min(ans, cal());

    cout << ans << '\n';

    return 0;
}

• Subtask 1: 15 / 15
• Subtask 2: 45 / 45
• Subtask 3: 40 / 40