Submission #654859

#	Time	Username	Problem	Language	Result	Execution time	Memory
654859		benjaminkleyn	Sails (IOI07_sails)	C++17	30 / 100	1084 ms	12808 KiB

sails

#pragma GCC optimize("Ofast")
#pragma GCC optimize("unroll-loops")
#pragma GCC target("avx,avx2,fma")
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;

const int max_n = 100'000;
int n;
pair<int,int> mast[max_n];

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);

    cin >> n;
    for (int i = 0; i < n; i++)
        cin >> mast[i].first >> mast[i].second;

    sort(mast, mast + n);

    set<pair<int,int>> H;
    unordered_map<int,int> cnt;
    for (int h = 1; h <= mast[n - 1].first; h++)
    {
        cnt[h] = 0;
        H.insert({cnt[h], h});
    }

    for (int i = 0; i < n; i++)
    {
        vector<pair<int,int>> best;
        for (auto [count, height] : H)
            if (best.size() >= mast[i].second)
                break;
            else if (height <= mast[i].first)
                best.push_back({count, height});

        for (auto [count, height] : best)
        {
            H.erase({count, height});
            H.insert({count + 1, height});
            cnt[height] = count + 1;
        }
    }

    ll sum = 0;
    for (auto [count, height] : H)
        sum += count * (count - 1) / 2;

    cout << sum << '\n';

    return 0;
}

Compilation message (stderr)

sails.cpp: In function 'int main()':
sails.cpp:35:29: warning: comparison of integer expressions of different signedness: 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   35 |             if (best.size() >= mast[i].second)
      |                 ~~~~~~~~~~~~^~~~~~~~~~~~~~~~~

• Subtask 1: 5 / 5
• Subtask 2: 10 / 10
• Subtask 3: 10 / 10
• Subtask 4: 5 / 5
• Subtask 5: 0 / 10
• Subtask 6: 0 / 10
• Subtask 7: 0 / 10
• Subtask 8: 0 / 10
• Subtask 9: 0 / 10
• Subtask 10: 0 / 10
• Subtask 11: 0 / 10