제출 #702594

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
702594		boris_mihov	메기 농장 (IOI22_fish)	C++17	100 / 100	361 ms	147520 KiB

fish

#include "fish.h"
#include <algorithm>
#include <iostream>
#include <cassert>
#include <numeric>
#include <vector>

#pragma GCC optimize ("Ofast,fast-math")
#pragma GCC target ("sse4")

typedef long long llong;
const int MAXN = 100000 + 10;
const int MAXM = 600000 + 10;
 
struct Position
{
    int y;
    int idx;
    llong in;
    llong left;
    llong right;
 
    Position(int _y, int _idx, llong _in, llong _left, llong _right)
    {
        y = _y;
        idx = _idx;
        left = _left;
        right = _right;
        in = _in;
    }
};
 
int cnt;
int n, m;
llong dp[MAXM][2];
std::vector <Position> pos[MAXN];
std::vector <Position> posUncleared[MAXN];
std::vector <std::pair <int,int>> fish[MAXN];
std::vector <llong> minusIN[MAXM];
std::vector <llong> minusL[MAXM];
std::vector <llong> LR[MAXM];
 
llong max_weights(int N, int M, std::vector <int> X, std::vector <int> Y, std::vector <int> W) 
{
    n = N; m = M;   
    for (int i = 0 ; i < m ; ++i)
    {
        fish[X[i] + 1].emplace_back(Y[i] + 1, W[i]);
    }
 
    for (int x = 1 ; x <= n ; ++x)
    {
        std::sort(fish[x].begin(), fish[x].end());
        for (const auto &[y, w] : fish[x])
        {
            if (x != 1)
            {
                posUncleared[x - 1].push_back({y, 0, 0LL, 0LL, 0LL});
            }
 
            if (x != n)
            {
                posUncleared[x + 1].push_back({y, 0, 0LL, 0LL, 0LL});
            }
        }
    }
 
    for (int x = 1 ; x <= n ; ++x)
    {
        std::sort(posUncleared[x].begin(), posUncleared[x].end(), [&](Position a, Position b)
        {
            return a.y < b.y;
        });
        
        for (Position p : posUncleared[x])
        {
            if (!pos[x].empty() && pos[x].back().y == p.y)
            {
                continue;
            }
 
            pos[x].push_back(p);
        }
 
        int ptrL = 0;
        int ptrR = 0;
        int ptrIN = 0;
        llong inSum = 0;
        llong leftSum = 0;
        llong rightSum = 0;
        for (Position &p : pos[x])
        {
            while (ptrL < fish[x - 1].size() && fish[x - 1][ptrL].first <= p.y)
            {
                leftSum += fish[x - 1][ptrL].second;
                ptrL++;
            }
 
            while (ptrR < fish[x + 1].size() && fish[x + 1][ptrR].first <= p.y)
            {
                rightSum += fish[x + 1][ptrR].second;
                ptrR++;
            }
 
            while (ptrIN < fish[x].size() && fish[x][ptrIN].first <= p.y)
            {
                inSum += fish[x][ptrIN].second;
                ptrIN++;
            }
 
            p.in = inSum;
            p.left = leftSum;
            p.right = rightSum;
        }
    }
    
    for (int x = 1 ; x <= n ; ++x)
    {
        for (Position &p : pos[x])
        {
            p.idx = ++cnt;
        }
    }

    llong max = 0;
    for (int x = n ; x >= 1 ; --x)
    {
        if (x + 3 <= n)
        {
            for (const Position &curr : pos[x + 3])
            {
                max = std::max(max, dp[curr.idx][0] + curr.left + curr.right);
            }
        }
        
        for (int type = 0 ; type < 2 ; ++type)
        {
            for (const Position &curr : pos[x])
            {
                if (x == n)
                {
                    continue;
                }

                dp[curr.idx][type] = max;
                int l = -1, r = pos[x + 1].size(), mid;
                while (l < r - 1)
                {
                    mid = (l + r) >> 1;
                    if (pos[x + 1][mid].y < curr.y) l = mid;
                    else r = mid;
                }
 
                if (l >= 0)
                {
                    dp[curr.idx][type] = std::max(dp[curr.idx][type], minusIN[x + 1][l]);
                }
 
                if (r < pos[x + 1].size() && type == 0)
                {
                    dp[curr.idx][type] = std::max(dp[curr.idx][type], LR[x + 1][r] - curr.in - curr.right);
                }
 
                if (x + 2 <= n)
                {
                    l = -1;
                    r = pos[x + 2].size();
                    while (l < r - 1)
                    {
                        mid = (l + r) >> 1;
                        if (pos[x + 2][mid].y < curr.y) l = mid;
                        else r = mid;
                    }
 
                    if (l >= 0)
                    {
                        dp[curr.idx][type] = std::max(dp[curr.idx][type], minusL[x + 2][l]);
                    }
 
                    if (r < pos[x + 2].size())
                    {
                        dp[curr.idx][type] = std::max(dp[curr.idx][type], LR[x + 2][r] - curr.right);
                    }
                }
            }
        }

        LR[x].reserve(pos[x].size());
        minusL[x].reserve(pos[x].size());
        minusIN[x].reserve(pos[x].size());
        for (const Position &curr : pos[x])
        {
            minusIN[x].push_back(dp[curr.idx][1] - curr.in + curr.right);
            LR[x].push_back(dp[curr.idx][0] + curr.left + curr.right);
            minusL[x].push_back(dp[curr.idx][0] + curr.right);
        }

        for (int i = 1 ; i < pos[x].size() ; ++i)
        {
            minusIN[x][i] = std::max(minusIN[x][i - 1], minusIN[x][i]);
            minusL[x][i] = std::max(minusIN[x][i - 1], minusL[x][i]);
        }

        for (int i = (int)pos[x].size() - 2 ; i >= 0 ; --i)
        {
            LR[x][i] = std::max(LR[x][i], LR[x][i + 1]);
        }
    }

    for (int x = std::min(n, 3) ; x >= 1 ; --x)
    {
        for (const Position &curr : pos[x])
        {
            max = std::max(max, dp[curr.idx][0] + curr.left + curr.right);
        }
    }
 
    return max;
}

컴파일 시 표준 에러 (stderr) 메시지

fish.cpp: In function 'llong max_weights(int, int, std::vector<int>, std::vector<int>, std::vector<int>)':
fish.cpp:93:25: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   93 |             while (ptrL < fish[x - 1].size() && fish[x - 1][ptrL].first <= p.y)
      |                    ~~~~~^~~~~~~~~~~~~~~~~~~~
fish.cpp:99:25: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   99 |             while (ptrR < fish[x + 1].size() && fish[x + 1][ptrR].first <= p.y)
      |                    ~~~~~^~~~~~~~~~~~~~~~~~~~
fish.cpp:105:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  105 |             while (ptrIN < fish[x].size() && fish[x][ptrIN].first <= p.y)
      |                    ~~~~~~^~~~~~~~~~~~~~~~
fish.cpp:159:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<Position>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  159 |                 if (r < pos[x + 1].size() && type == 0)
      |                     ~~^~~~~~~~~~~~~~~~~~~
fish.cpp:180:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<Position>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  180 |                     if (r < pos[x + 2].size())
      |                         ~~^~~~~~~~~~~~~~~~~~~
fish.cpp:198:28: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<Position>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  198 |         for (int i = 1 ; i < pos[x].size() ; ++i)
      |                          ~~^~~~~~~~~~~~~~~

• Subtask 1: 3 / 3
• Subtask 2: 6 / 6
• Subtask 3: 9 / 9
• Subtask 4: 14 / 14
• Subtask 5: 21 / 21
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