Submission #858778

#	Time	Username	Problem	Language	Result	Execution time	Memory
858778		LucaIlie	Catfish Farm (IOI22_fish)	C++17	14 / 100	1117 ms	380736 KiB

fish

#include "fish.h"
#include <bits/stdc++.h>

using namespace std;

const int MAX_N = 3e5 + 2;
const long long INF = 1e18;
map<int, long long> costCell[MAX_N], dp[MAX_N], dpLower[MAX_N], spX[MAX_N];
vector <int> ys[MAX_N];

long long max_weights( int n, int m, vector <int> X, vector <int> Y, vector <int> W ) {

    for ( int i = 0; i < m; i++ ) {
        X[i]++;
        Y[i]++;
        costCell[X[i]][Y[i]] = W[i];
        ys[X[i] - 1].push_back( Y[i] );
        ys[X[i] + 1].push_back( Y[i] );
        ys[X[i]].push_back( Y[i] );
    }

    ys[0].clear();
    ys[n + 1].clear();
    for ( int x = 0; x <= n + 1; x++ )
        ys[x].push_back( 0 );
    for ( int x = 1; x <= n; x++ ) {
        sort( ys[x].begin(), ys[x].end() );
        ys[x].resize( unique( ys[x].begin(), ys[x].end() ) - ys[x].begin() );
    }

    for ( int x = 1; x <= n; x++ ) {
        for ( int y = 1; y <= n; y++ )
            spX[x][y] = spX[x][y - 1] + costCell[x][y];
    }

    dp[0][0] = dpLower[0][0] = 0;
    for ( int x = 1; x <= n + 1; x++ ) {
        for ( int i = 0; i < ys[x].size(); i++ ) {
            int crtY = ys[x][i];

            dp[x][crtY] = dpLower[x][crtY] = -INF;
            for ( int j = 0; j < ys[x - 1].size(); j++ ) {
                int prevY = ys[x - 1][j];

                if ( prevY <= crtY ) {
                    dpLower[x][crtY] = max( dpLower[x][crtY], dpLower[x - 1][prevY] + spX[x - 1][crtY] - spX[x - 1][prevY] );
                    dp[x][crtY] = max( dp[x][crtY], dpLower[x - 1][prevY] + spX[x - 1][crtY] - spX[x - 1][prevY] );
                }
                if ( prevY >= crtY )
                    dp[x][crtY] = max( dp[x][crtY], dp[x - 1][prevY] + spX[x][prevY] - spX[x][crtY] );
            }

            if ( x == 1 )
                continue;
            for ( int j = 0; j < ys[x - 2].size(); j++ ) {
                int prevY = ys[x - 2][j];

                if ( prevY <= crtY ) {
                    dpLower[x][crtY] = max( dpLower[x][crtY], dp[x - 2][prevY] + spX[x - 1][crtY] );
                    dp[x][crtY] = max( dp[x][crtY], dp[x - 2][prevY] + spX[x - 1][crtY] );
                }
                if ( prevY >= crtY ) {
                    dpLower[x][crtY] = max( dpLower[x][crtY], dp[x - 2][prevY] + spX[x - 1][prevY] );
                    dp[x][crtY] = max( dp[x][crtY], dp[x - 2][prevY] + spX[x - 1][prevY] );
                }
            }
        }
    }

    return dp[n + 1][0];
}

Compilation message (stderr)

fish.cpp: In function 'long long int max_weights(int, int, std::vector<int>, std::vector<int>, std::vector<int>)':
fish.cpp:38:28: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   38 |         for ( int i = 0; i < ys[x].size(); i++ ) {
      |                          ~~^~~~~~~~~~~~~~
fish.cpp:42:32: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   42 |             for ( int j = 0; j < ys[x - 1].size(); j++ ) {
      |                              ~~^~~~~~~~~~~~~~~~~~
fish.cpp:55:32: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   55 |             for ( int j = 0; j < ys[x - 2].size(); j++ ) {
      |                              ~~^~~~~~~~~~~~~~~~~~

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