Submission #47669

#	Time	Username	Problem	Language	Result	Execution time	Memory
47669		maksim_gaponov	Cultivation (JOI17_cultivation)	C++14	5 / 100	2068 ms	1016 KiB

cultivation

#include <bits/stdc++.h>

using namespace std;
typedef long long ll;

void openFiles() {
#ifdef KEK
	assert(freopen("input.txt", "r", stdin));
	assert(freopen("output.txt", "w", stdout));
#endif
}

void IOoptimize() {
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	cout.tie(0);
}

struct Action {
    int time;
    int l, r;
    int type;
    int id;
};

bool operator< (const Action &a1, const Action &a2) {
    if (a1.time == a2.time)
        return a1.id < a2.id;
    return a1.time < a2.time;
}

const int MAXN = 300;
const int MAX = 40;
int x[MAXN], y[MAXN];
int f[MAX];

int main() {
	openFiles();
	IOoptimize();
    int r, c;
    cin >> r >> c;
    int n;
    cin >> n;
    for (int i = 0; i < n; i++) {
        cin >> x[i] >> y[i];
        x[i]--;
        y[i]--;
    }
    int ans = INT_MAX;
    int cnt[4];
    for (cnt[0] = 0; cnt[0] <= MAX; cnt[0]++)
    for (cnt[1] = 0; cnt[1] <= MAX; cnt[1]++)
    for (cnt[2] = 0; cnt[2] <= MAX; cnt[2]++)
    for (cnt[3] = 0; cnt[3] <= MAX; cnt[3]++) {
        int new_ans = cnt[0] + cnt[1] + cnt[2] + cnt[3];
        if (ans <= new_ans)
            continue;
        memset(f, 0, sizeof(f));
        vector<Action> v;
        for (int i = 0; i < n; i++) {
            Action act;
            act.id = i;
            act.time = max(y[i] - cnt[1], 0);
            act.l = max(x[i] - cnt[0], 0);
            act.r = min(x[i] + cnt[2], r - 1);
            act.type = 1;
            v.push_back(act);
            act.time = min(y[i] + cnt[3] + 1, c);
            act.type = -1;
            v.push_back(act);
        }
        sort(v.begin(), v.end());
        int last = 0;
        int sq = 0;
        for (auto act : v) {
            //cout << act.time << " " << act.l << " " << act.r << " " << act.type << "\n";
            int active_count = 0;
            for (int i = 0; i < r; i++)
                if (f[i])
                    active_count++;
            sq += active_count * (act.time - last);
            last = act.time;
            for (int i = act.l; i <= act.r; i++)
                f[i] += act.type;
        }
        //cout << sq << "\n";
        //cout << "--/--\n";
        if (sq == r * c)
            ans = new_ans;
    }
    cout << ans;
	return 0;
}

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