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Submission #962408

# Submission time Handle Problem Language Result Execution time Memory
962408 2024-04-13T13:25:56 Z RaresFelix Aliens (IOI16_aliens) C++17
4 / 100
 1 ms 600 KB 
#include <bits/stdc++.h>
#include "aliens.h"
//#pragma GCC optimize("O3")
//#pragma GCC target("avx,avx2,fma")

#define sz(x) int((x).size())
#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()

using namespace std;
using ll = long long;
using ld = long double;  // or double, if TL is tight
using str = string;
using ii = pair<int, int>;
using pl = pair<ll, ll>;
using vi = vector<int>;
using vll = vector<ll>;

const ll INF = 1e16;

struct CHT {
    int p = 0;
    vector<pl> V;
    void insert(ll a, ll b) { /// add ax + b
        if(!V.empty() && V.back().first == a) {
            V.back().second = min(V.back().second, b);
        } else
            V.push_back({a, b});
    }
    ll query(ll x) {
        if(V.empty()) return INF;
        auto eval = [&](pl f) {
            return f.first * x + f.second;
        };
        while(p + 1 < V.size() && eval(V[p]) > eval(V[p + 1])) ++p;
        return eval(V[p]);
    }
};

ll take_photos(int n0, int m, int k, vi r, vi c) {
    vector<ii> SegInit;
    for(int i = 0; i < n0; ++i) {
        SegInit.push_back({min(r[i], c[i]), max(r[i], c[i]) + 1});
    }
    sort(all(SegInit), [&](auto a, auto b) {
        if(a.first != b.first) return a < b;
        return a > b;
    });
    vector<ii> Seg;
    int cur_dr = -1;
    for(auto [st, dr] : SegInit) {
        if(dr <= cur_dr) continue;
        else {
            Seg.push_back({st, dr});
            cur_dr = dr;
        }
    }
    int n = Seg.size();
    vll st(n, 0), dr(n, 0), sb(n, 0);
    for(int i = 0; i < n; ++i) {
        st[i] = Seg[i].first; dr[i] = Seg[i].second;
        sb[i] = (dr[i] - st[i]) * (dr[i] - st[i]);
        if(i) {
            if(dr[i - 1] > st[i]) 
                sb[i] -= (dr[i - 1] - st[i]) * (dr[i - 1] - st[i]);
            sb[i] += sb[i - 1];
        }
    }
    auto cost = [&](int i, int j) {
        return (dr[j] - st[i]) * (dr[j] - st[i]) - (dr[i] - st[i]) * (dr[i] - st[i])
            - sb[j] + sb[i];
        return (dr[j] * dr[j] - sb[j]) 
            + (2 * st[i] * dr[i] - dr[i] * dr[i] + sb[i]) 
            - 2 * st[i] * dr[j];
    };
    ll re0 = sb.back();

    vector<vector<ll> > DP(n, vector(k + 1, INF));
    vector<CHT> Sol(k + 1);
    for(int i = 0; i < n; ++i) {
        DP[i][1] = cost(0, i);
        for(int j = 2; j <= k; ++j) {
            ll dpant = 0;
            if(i) dpant = DP[i - 1][j - 1];
            Sol[j - 1].insert(- 2 * st[i], 
                    dpant + (2 * st[i] * dr[i] - dr[i] * dr[i] + sb[i]));

            DP[i][j] = min(DP[i][j], Sol[j - 1].query(dr[i]));


            DP[i][j] += dr[i] * dr[i] - sb[i];
        }
    }
    ll re = INF;
    for(auto it : DP[n - 1]) re = min(re, it);
    re += re0;
    return re;
}

Compilation message

aliens.cpp: In member function 'll CHT::query(ll)':
aliens.cpp:35:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   35 |         while(p + 1 < V.size() && eval(V[p]) > eval(V[p + 1])) ++p;
      |               ~~~~~~^~~~~~~~~~

Subtask #1
4.0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Correct answer: answer = 4
2 Correct 0 ms 348 KB Correct answer: answer = 4
3 Correct 1 ms 348 KB Correct answer: answer = 4
4 Correct 1 ms 600 KB Correct answer: answer = 12
5 Correct 0 ms 348 KB Correct answer: answer = 52
6 Correct 0 ms 348 KB Correct answer: answer = 210
7 Correct 1 ms 348 KB Correct answer: answer = 88
8 Correct 1 ms 344 KB Correct answer: answer = 7696
9 Correct 0 ms 348 KB Correct answer: answer = 1
10 Correct 1 ms 512 KB Correct answer: answer = 2374
11 Correct 0 ms 348 KB Correct answer: answer = 9502
12 Correct 0 ms 348 KB Correct answer: answer = 49
13 Correct 1 ms 348 KB Correct answer: answer = 151
14 Correct 0 ms 348 KB Correct answer: answer = 7550
15 Correct 0 ms 348 KB Correct answer: answer = 7220
16 Correct 0 ms 348 KB Correct answer: answer = 7550
17 Correct 0 ms 348 KB Correct answer: answer = 10000
18 Correct 0 ms 348 KB Correct answer: answer = 10000
19 Correct 0 ms 348 KB Correct answer: answer = 624
20 Correct 0 ms 344 KB Correct answer: answer = 10000

Subtask #2
0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Correct answer: answer = 1
2 Correct 0 ms 344 KB Correct answer: answer = 4
3 Correct 0 ms 348 KB Correct answer: answer = 1
4 Correct 1 ms 348 KB Correct answer: answer = 5
5 Correct 0 ms 348 KB Correct answer: answer = 41
6 Incorrect 1 ms 348 KB Wrong answer: output = 171005, expected = 71923
7 Halted 0 ms 0 KB -

Subtask #3
0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Correct answer: answer = 4
2 Correct 0 ms 348 KB Correct answer: answer = 4
3 Correct 1 ms 348 KB Correct answer: answer = 4
4 Correct 1 ms 600 KB Correct answer: answer = 12
5 Correct 0 ms 348 KB Correct answer: answer = 52
6 Correct 0 ms 348 KB Correct answer: answer = 210
7 Correct 1 ms 348 KB Correct answer: answer = 88
8 Correct 1 ms 344 KB Correct answer: answer = 7696
9 Correct 0 ms 348 KB Correct answer: answer = 1
10 Correct 1 ms 512 KB Correct answer: answer = 2374
11 Correct 0 ms 348 KB Correct answer: answer = 9502
12 Correct 0 ms 348 KB Correct answer: answer = 49
13 Correct 1 ms 348 KB Correct answer: answer = 151
14 Correct 0 ms 348 KB Correct answer: answer = 7550
15 Correct 0 ms 348 KB Correct answer: answer = 7220
16 Correct 0 ms 348 KB Correct answer: answer = 7550
17 Correct 0 ms 348 KB Correct answer: answer = 10000
18 Correct 0 ms 348 KB Correct answer: answer = 10000
19 Correct 0 ms 348 KB Correct answer: answer = 624
20 Correct 0 ms 344 KB Correct answer: answer = 10000
21 Correct 0 ms 348 KB Correct answer: answer = 1
22 Correct 0 ms 344 KB Correct answer: answer = 4
23 Correct 0 ms 348 KB Correct answer: answer = 1
24 Correct 1 ms 348 KB Correct answer: answer = 5
25 Correct 0 ms 348 KB Correct answer: answer = 41
26 Incorrect 1 ms 348 KB Wrong answer: output = 171005, expected = 71923
27 Halted 0 ms 0 KB -

Subtask #4
0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Correct answer: answer = 4
2 Correct 0 ms 348 KB Correct answer: answer = 4
3 Correct 1 ms 348 KB Correct answer: answer = 4
4 Correct 1 ms 600 KB Correct answer: answer = 12
5 Correct 0 ms 348 KB Correct answer: answer = 52
6 Correct 0 ms 348 KB Correct answer: answer = 210
7 Correct 1 ms 348 KB Correct answer: answer = 88
8 Correct 1 ms 344 KB Correct answer: answer = 7696
9 Correct 0 ms 348 KB Correct answer: answer = 1
10 Correct 1 ms 512 KB Correct answer: answer = 2374
11 Correct 0 ms 348 KB Correct answer: answer = 9502
12 Correct 0 ms 348 KB Correct answer: answer = 49
13 Correct 1 ms 348 KB Correct answer: answer = 151
14 Correct 0 ms 348 KB Correct answer: answer = 7550
15 Correct 0 ms 348 KB Correct answer: answer = 7220
16 Correct 0 ms 348 KB Correct answer: answer = 7550
17 Correct 0 ms 348 KB Correct answer: answer = 10000
18 Correct 0 ms 348 KB Correct answer: answer = 10000
19 Correct 0 ms 348 KB Correct answer: answer = 624
20 Correct 0 ms 344 KB Correct answer: answer = 10000
21 Correct 0 ms 348 KB Correct answer: answer = 1
22 Correct 0 ms 344 KB Correct answer: answer = 4
23 Correct 0 ms 348 KB Correct answer: answer = 1
24 Correct 1 ms 348 KB Correct answer: answer = 5
25 Correct 0 ms 348 KB Correct answer: answer = 41
26 Incorrect 1 ms 348 KB Wrong answer: output = 171005, expected = 71923
27 Halted 0 ms 0 KB -

Subtask #5
0 / 19.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Correct answer: answer = 4
2 Correct 0 ms 348 KB Correct answer: answer = 4
3 Correct 1 ms 348 KB Correct answer: answer = 4
4 Correct 1 ms 600 KB Correct answer: answer = 12
5 Correct 0 ms 348 KB Correct answer: answer = 52
6 Correct 0 ms 348 KB Correct answer: answer = 210
7 Correct 1 ms 348 KB Correct answer: answer = 88
8 Correct 1 ms 344 KB Correct answer: answer = 7696
9 Correct 0 ms 348 KB Correct answer: answer = 1
10 Correct 1 ms 512 KB Correct answer: answer = 2374
11 Correct 0 ms 348 KB Correct answer: answer = 9502
12 Correct 0 ms 348 KB Correct answer: answer = 49
13 Correct 1 ms 348 KB Correct answer: answer = 151
14 Correct 0 ms 348 KB Correct answer: answer = 7550
15 Correct 0 ms 348 KB Correct answer: answer = 7220
16 Correct 0 ms 348 KB Correct answer: answer = 7550
17 Correct 0 ms 348 KB Correct answer: answer = 10000
18 Correct 0 ms 348 KB Correct answer: answer = 10000
19 Correct 0 ms 348 KB Correct answer: answer = 624
20 Correct 0 ms 344 KB Correct answer: answer = 10000
21 Correct 0 ms 348 KB Correct answer: answer = 1
22 Correct 0 ms 344 KB Correct answer: answer = 4
23 Correct 0 ms 348 KB Correct answer: answer = 1
24 Correct 1 ms 348 KB Correct answer: answer = 5
25 Correct 0 ms 348 KB Correct answer: answer = 41
26 Incorrect 1 ms 348 KB Wrong answer: output = 171005, expected = 71923
27 Halted 0 ms 0 KB -

Subtask #6
0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Correct answer: answer = 4
2 Correct 0 ms 348 KB Correct answer: answer = 4
3 Correct 1 ms 348 KB Correct answer: answer = 4
4 Correct 1 ms 600 KB Correct answer: answer = 12
5 Correct 0 ms 348 KB Correct answer: answer = 52
6 Correct 0 ms 348 KB Correct answer: answer = 210
7 Correct 1 ms 348 KB Correct answer: answer = 88
8 Correct 1 ms 344 KB Correct answer: answer = 7696
9 Correct 0 ms 348 KB Correct answer: answer = 1
10 Correct 1 ms 512 KB Correct answer: answer = 2374
11 Correct 0 ms 348 KB Correct answer: answer = 9502
12 Correct 0 ms 348 KB Correct answer: answer = 49
13 Correct 1 ms 348 KB Correct answer: answer = 151
14 Correct 0 ms 348 KB Correct answer: answer = 7550
15 Correct 0 ms 348 KB Correct answer: answer = 7220
16 Correct 0 ms 348 KB Correct answer: answer = 7550
17 Correct 0 ms 348 KB Correct answer: answer = 10000
18 Correct 0 ms 348 KB Correct answer: answer = 10000
19 Correct 0 ms 348 KB Correct answer: answer = 624
20 Correct 0 ms 344 KB Correct answer: answer = 10000
21 Correct 0 ms 348 KB Correct answer: answer = 1
22 Correct 0 ms 344 KB Correct answer: answer = 4
23 Correct 0 ms 348 KB Correct answer: answer = 1
24 Correct 1 ms 348 KB Correct answer: answer = 5
25 Correct 0 ms 348 KB Correct answer: answer = 41
26 Incorrect 1 ms 348 KB Wrong answer: output = 171005, expected = 71923
27 Halted 0 ms 0 KB -