Submission #562698

#	Time	Username	Problem	Language	Result	Execution time	Memory
562698		hoanghq2004	Aliens (IOI16_aliens)	C++14	0 / 100	3 ms	468 KiB

aliens

#include <bits/stdc++.h>
#pragma GCC optimize ("O3")
#pragma GCC optimize ("unroll-loops")
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#include "aliens.h"

using namespace __gnu_pbds;
using namespace std;

template <typename T>
using ordered_set = tree <T, null_type, less <T>, rb_tree_tag, tree_order_statistics_node_update>;

const int N = 4010;

long long f[N][N];

long long take_photos(int n, int m, int k, std::vector<int> r, std::vector<int> c) {
    assert(n != 1);
    vector <pair <int, int> > P, Q;
    for (int i = 0; i < n; ++i) {
        if (r[i] > c[i]) swap(r[i], c[i]);
        P.push_back({r[i], - c[i]});
    }
    sort(P.begin(), P.end());
    for (auto &[x, y]: P) y = - y;
    for (auto [x, y]: P) {
        if (Q.size() && y <= Q.back().second) continue;
        Q.push_back({x, y});
    }
    swap(P, Q);
    for (int i = 0; i < P.size(); ++i) {
        f[i][1] = 1LL * (P[i].second - P[0].first + 1) * (P[i].second - P[0].first + 1);
        for (int j = 2; j <= k; ++j) {
            f[i][j] = f[i][j - 1];
            for (int ii = 1; ii <= i; ++ii) {
                long long cur = 1LL * (P[i].second - P[ii].first + 1) * (P[i].second - P[ii].first + 1);
                if (P[ii].first <= P[ii - 1].second) {
                    cur -= 1LL * (P[ii - 1].second - P[ii].first + 1) * (P[ii - 1].second - P[ii].first + 1);
                }
                f[i][j] = min(f[i][j], f[ii - 1][j - 1] + cur);
            }
        }
    }
    return f[P.size() - 1][k];
}
//
//int main() {
//    int n, m, k;
//    assert(3 == scanf("%d %d %d", &n, &m, &k));
//    std::vector<int> r(n), c(n);
//    for (int i = 0; i < n; i++) {
//        assert(2 == scanf("%d %d", &r[i], &c[i]));
//    }
//    long long ans = take_photos(n, m, k, r, c);
//
//
//    printf("%lld\n", ans);
//    return 0;
//}

Compilation message (stderr)

aliens.cpp: In function 'long long int take_photos(int, int, int, std::vector<int>, std::vector<int>)':
aliens.cpp:26:16: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   26 |     for (auto &[x, y]: P) y = - y;
      |                ^
aliens.cpp:27:15: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   27 |     for (auto [x, y]: P) {
      |               ^
aliens.cpp:32:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   32 |     for (int i = 0; i < P.size(); ++i) {
      |                     ~~^~~~~~~~~~

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