Submission #432066

#	Time	Username	Problem	Language	Result	Execution time	Memory
432066		Tangent	Aliens (IOI16_aliens)	C++17	25 / 100	2084 ms	472 KiB

aliens

#include "aliens.h"
#include "bits/stdc++.h"

using namespace std;

typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
typedef vector<int> vii;
typedef vector<ll> vll;
typedef vector<pii> vpii;
typedef vector<pll> vpll;
typedef vector<vii> vvii;
typedef vector<vll> vvll;
typedef vector<vpii> vvpii;
typedef vector<vpll> vvpll;

#define ffor(i, a, b) for (ll i = (a); i < (ll)(b); i++)
#define fford(i, a, b) for (ll i = (a); i > (ll)(b); i--)
#define rep(i, n) ffor(i, 0, n)
#define forin(x, a) for (auto &x: a)
#define all(a) a.begin(), a.end()
#define sq(x) (ll)(x) * (x)

pii intervals[100000], merged[100000];

long long take_photos(int n, int m, int k, std::vector<int> r, std::vector<int> c) {
    rep(i, n) {
        if (r[i] > c[i]) {
            swap(r[i], c[i]);
        }
        intervals[i] = {r[i], -c[i]};
    }
    sort(intervals, intervals + n);
    merged[0] = {intervals[0].first, -intervals[0].second};
    int cnt = 1;
    ffor(i, 1, n) {
        if (-intervals[i].second > merged[cnt - 1].second) {
            merged[cnt++] = {intervals[i].first, -intervals[i].second};
        }
    }
    vll dp(cnt, 1ll << 62);
    rep(i, cnt) {
        dp[i] = sq(merged[i].second - merged[0].first + 1);
    }
    ll res = dp.back();
    ffor(used, 2, k + 1) {
        vll ndp(cnt, 1ll << 62);
        int start = cnt - 2;
        fford(i, cnt - 1, used - 2) {
            fford(j, start, -1) {
                ll curr = dp[j] + sq(merged[i].second - merged[j + 1].first + 1) - sq(max(0, merged[j].second - merged[j + 1].first + 1));
                if (curr < ndp[i]) {
                    ndp[i] = curr;
                    start = j;
                }
            }
        }
        dp = move(ndp);
        res = min(res, dp.back());
    }
    
    return res;
}

• Subtask 1: 4 / 4
• Subtask 2: 12 / 12
• Subtask 3: 9 / 9
• Subtask 4: 0 / 16
• Subtask 5: 0 / 19
• Subtask 6: 0 / 40