Submission #610903

#	Time	Username	Problem	Language	Result	Execution time	Memory
610903		skittles1412	Aliens (IOI16_aliens)	C++17	0 / 100	12 ms	320 KiB

aliens

#include "bits/extc++.h"

using namespace std;

template <typename T>
void dbgh(const T& t) {
    cerr << t << endl;
}

template <typename T, typename... U>
void dbgh(const T& t, const U&... u) {
    cerr << t << " | ";
    dbgh(u...);
}

#ifdef DEBUG
#define dbg(...)                                              \
    cerr << "L" << __LINE__ << " [" << #__VA_ARGS__ << "]: "; \
    dbgh(__VA_ARGS__);
#else
#define dbg(...)
#define cerr   \
    if (false) \
    cerr
#endif

using ll = long long;

#define endl "\n"
#define long int64_t
#define sz(x) int((x).size())

int n;
vector<pair<int, int>> arr;

long sq(long x) {
    return x * x;
}

pair<long, int> solve(long x) {
    pair<long, int> dp[n + 1];
    dp[n] = {0, 0};
    for (int i = n - 1; i >= 0; i--) {
        dp[i] = {long(4e18), 0};
        for (int j = i; j < n; j++) {
            auto [a, b] = dp[j + 1];
            dp[i] = min(dp[i], pair<long, int> {
                                   a + sq(arr[j].second - arr[i].first + 1) + x,
                                   b + 1});
        }
    }
    return dp[0];
}

ll take_photos(int _n, int, int k, vector<int> a1, vector<int> a2) {
    n = _n;
    for (int i = 0; i < n; i++) {
        arr.emplace_back(min(a1[i], a2[i]), max(a1[i], a2[i]));
    }
    sort(begin(arr), end(arr), [&](pair<int, int> a, pair<int, int> b) -> bool {
        if (a.first == b.first) {
            return a.second > b.second;
        }
        return a.first < b.first;
    });
    vector<pair<int, int>> narr;
    int mx = -1;
    for (auto& [l, r] : arr) {
        if (r > mx) {
            mx = r;
            narr.emplace_back(l, r);
        }
    }
    swap(arr, narr);
    n = sz(arr);
    long l = 0, r = 1e18;
    while (l < r) {
        long mid = (l + r) / 2;
        if (solve(mid).second <= k) {
            r = mid;
        } else {
            l = mid + 1;
        }
    }
    auto [x, cnt] = solve(l);
    return x - cnt * l;
}

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