Submission #671274

#	Time	Username	Problem	Language	Result	Execution time	Memory
671274		pls33	Catfish Farm (IOI22_fish)	C++17	0 / 100	729 ms	2097152 KiB

fish

#include <bits/stdc++.h>
#include "fish.h"
using namespace std;
#pragma region dalykai
using p32 = pair<int, int>;
using p32u = pair<uint32_t, uint32_t>;
using p64 = pair<int64_t, int64_t>;
using p64u = pair<uint64_t, uint64_t>;
using vi16 = vector<int16_t>;
using vi16u = vector<uint16_t>;
using vi32 = vector<int>;
using vi32u = vector<uint32_t>;
using vi64 = vector<int64_t>;
using vi64u = vector<uint64_t>;
using vp32 = vector<p32>;
using vp32u = vector<p32u>;
using vp64 = vector<p64>;
using vp64u = vector<p64u>;
using vvi32 = vector<vi32>;
using vvi32u = vector<vi32u>;
using vvi64 = vector<vi64>;
using vvi64u = vector<vi64u>;
using vvp32 = vector<vp32>;
using vvp32u = vector<vp32u>;
using vvp64 = vector<vp64>;
using vvp64u = vector<vp64u>;
#pragma endregion

void update(int64_t val, p32 fish, vvi64 &vect)
{
    vect[fish.first][fish.second] = max(vect[fish.first][fish.second], val);
}

int64_t weight_sum(int i, int j, vi64 &prefix)
{
    if (i == -1)
    {
        return 0;
    }

    int64_t sum = prefix[j];
    if (i)
    {
        sum -= prefix[i - 1];
    }

    return sum;
}

int64_t new_weight(p32 lhs, p32 rhs, vvi64 &prefix)
{
    int64_t left = rhs.first
                       ? weight_sum(0, rhs.second, prefix[rhs.first - 1])
                       : 0;

    int64_t right = (rhs.first + 1 < (int)prefix.size())
                        ? weight_sum(0, rhs.second, prefix[rhs.first + 1])
                        : 0;
    if (lhs.first == -1)
    {
        return left + right;
    }

    if (rhs.first - lhs.first > 2)
    {
        return left + right;
    }

    if (rhs.first - lhs.first == 2)
    {
        if (lhs.second >= rhs.second)
        {
            return right;
        }

        left -= weight_sum(0, lhs.second, prefix[rhs.first - 1]);

        return left + right;
    }

    if (lhs.second > rhs.second)
    {
        left = -weight_sum(0, rhs.second, prefix[rhs.first]);
        return left + right;
    }

    left -= weight_sum(0, lhs.second, prefix[rhs.first]) +
            weight_sum(0, lhs.second, prefix[rhs.first - 1]);
    return left + right;
}

long long max_weights(int N, int M,
                      std::vector<int> X,
                      std::vector<int> Y,
                      std::vector<int> W)
{
    vp32 fish;
    vvi64 prefix(N, vi64(N));
    for (int i = 0; i < M; i++)
    {
        prefix[X[i]][Y[i]] = W[i];

        if (X[i])
        {
            fish.push_back({X[i] - 1, Y[i]});
        }
        if (X[i] < N - 1)
        {
            fish.push_back({X[i] + 1, Y[i]});
        }
    }

    for (auto &row : prefix)
    {
        for (int i = 1; i < (int)row.size(); i++)
        {
            row[i] += row[i - 1];
        }
    }

    sort(fish.begin(), fish.end());

    vvi64 decrease(N, vi64(N));
    vvi64 increase = decrease;

    for (auto &f : fish)
    {
        update(new_weight(p32(-1, -1), f, prefix), f, increase);
        update(new_weight(p32(-1, -1), f, prefix), f, decrease);
        for (int i = 0; i < f.first; i++)
        {
            for (int j = 0; j < N; j++)
            {
                if (i == f.first - 1 && j == f.second)
                {
                    continue;
                }
                int64_t prev = max(increase[i][j], decrease[i][j]);
                prev += new_weight(p32(i, j), f, prefix);

                if (i == f.first - 1)
                {
                    if (j < f.second)
                    {
                        update(prev, f, increase);
                    }
                    else
                    {
                        update(prev, f, decrease);
                    }
                }
                else
                {
                    update(prev, f, increase);
                    update(prev, f, decrease);
                }
            }
        }
    }

    int64_t res = 0;
    for (int i = 0; i < (int)increase.size(); i++)
    {
        for (int j = 0; j < (int)increase[0].size(); j++)
        {
            res = max({res, increase[i][j], decrease[i][j]});
        }
    }

    return res;
}

Compilation message (stderr)

fish.cpp:4: warning: ignoring '#pragma region dalykai' [-Wunknown-pragmas]
    4 | #pragma region dalykai
      | 
fish.cpp:27: warning: ignoring '#pragma endregion ' [-Wunknown-pragmas]
   27 | #pragma endregion
      |

• Subtask 1: 0 / 3
• Subtask 2: 0 / 6
• Subtask 3: 0 / 9
• Subtask 4: 0 / 14
• Subtask 5: 0 / 21
• Subtask 6: 0 / 17
• Subtask 7: 0 / 14
• Subtask 8: 0 / 16