Submission #1304418

#	Time	Username	Problem	Language	Result	Execution time	Memory
1304418		BilAktauAlmansur	Cutting a Rectangle (BOI24_rectangle)	C++20	25 / 100	2112 ms	481988 KiB

Main

#include <bits/stdc++.h>
using namespace std;
#define int long long
#define fi first
#define se second
const int N = 3e5 + 7, M = 5e6 + 7, mod = 1e9 + 7;

int n;
pair<int, int> p[N];
multiset<int> ga[M], gb[M];
void solve() {
    cin>>n;
    int area = 0;
    for(int i = 1; i <= n; i++) {
        cin>>p[i].fi>>p[i].se;
        area = area + p[i].fi * p[i].se;
    }
    vector<int> ans;
    for(int i = 1; i <= 5e6; i++) {
        if(area % i == 0 && i <= area / i) {
            int x = area / i, y = i;
            vector<int> us(n + 1, 0);
            for(int j = 1; j <= n; j++) {
                ga[p[j].fi].clear();
                gb[p[j].se].clear();
            }
            for(int j = 1; j <= n; j++) {
                ga[p[j].fi].insert(j);
                gb[p[j].se].insert(j);
            }
            while(x && y) {
                if(x < y)swap(x, y);
                int ok = 0;
                if(x <= 5e6) {
                    for(auto i : ga[x]) {
                        if(!us[i]) {
                            us[i] = 1;
                            y -= p[i].se;
                            ok = i;
                            break;
                        }
                    }
                }
                if(ok) {
                    ga[p[ok].fi].erase(ga[p[ok].fi].find(ok));
                    gb[p[ok].se].erase(gb[p[ok].se].find(ok));
                    continue;
                }
                for(auto i : gb[y]) {
                    if(!us[i]) {
                        us[i] = 1;
                        x -= p[i].fi;
                        ok = i;
                        break;
                    }
                }
                if(ok) {
                    ga[p[ok].fi].erase(ga[p[ok].fi].find(ok));
                    gb[p[ok].se].erase(gb[p[ok].se].find(ok));
                    continue;
                }
                if(x <= 5e6) {
                    for(auto i : gb[x]) {
                        if(!us[i]) {
                            us[i] = 1;
                            y -= p[i].fi;
                            ok = i;
                            break;
                        }
                    }
                }
                if(ok) {
                    ga[p[ok].fi].erase(ga[p[ok].fi].find(ok));
                    gb[p[ok].se].erase(gb[p[ok].se].find(ok));
                    continue;
                }
                for(auto i : ga[y]) {
                    if(!us[i]) {
                        us[i] = 1;
                        x -= p[i].se;
                        ok = i;
                        break;
                    }
                }
                if(ok) {
                    ga[p[ok].fi].erase(ga[p[ok].fi].find(ok));
                    gb[p[ok].se].erase(gb[p[ok].se].find(ok));
                    continue;
                }else break;
            }
            bool ok = 1;
            for(int j = 1; j <= n; j++)
                if(!us[j])ok = 0;
            if((!x || !y) && ok)ans.push_back(i);
        }
    }
    cout << ans.size() << '\n';
    for(auto i : ans)cout << i << '\n';
}
signed main() {
    ios_base::sync_with_stdio(NULL);
    cin.tie(NULL);
    int T = 1;
    // cin>>T;
    while(T --)solve();
}

• Subtask 1: 25 / 25
• Subtask 2: 0 / 20
• Subtask 3: 0 / 55