oj.uz

Submission #633436

# Submission time Handle Problem Language Result Execution time Memory
633436 2022-08-22T13:19:29 Z Lawliet Catfish Farm (IOI22_fish) C++17
0 / 100
 28 ms 4172 KB 
#include "fish.h"
#include <bits/stdc++.h>

using namespace std;
typedef long long ll;

const int maxn = 310;

int n;

ll s[maxn][2];

ll maxSuffix[maxn];
ll dp[maxn][2][2];

long long max_weights(int N, int M, vector<int> X, vector<int> Y, vector<int> W) 
{
    n = N;

    for(int i = 0 ; i < M ; i++)
    {
        X[i]++; Y[i]++;
        s[ X[i] ][ Y[i] ] += W[i];
    }

    for(int i = 1 ; i <= n ; i++)
        for(int j = n ; j >= 0 ; j--)
            s[i][j] += s[i][j + 1];

    for(int hI = 0 ; hI <= 1 ; hI++)
    {
        for(int hB = 0 ; hB <= 1 ; hB++)
        {
            if( hB <= hI )
                dp[n][hI][hB] = 0;
            else
                dp[n][hI][hB] = s[n][hI + 1] - s[n][hB + 1];
        }
    }

    for(int i = n - 1 ; i > 0 ; i--)
    {
        for(int hI = 0 ; hI <= 1 ; hI++)
        {
            // Calculating dp[i][hI][0]

            for(int x = 0 ; x <= 1 ; x++)
            {
                if( x <= hI )
                    dp[i][hI][0] = max( dp[i][hI][0] , dp[i + 1][x][hI] );
                else
                    dp[i][hI][0] = max( dp[i][hI][0] , dp[i + 1][x][hI] + s[i][hI + 1] - s[i][x + 1] );
            }

            // Calculating dp[i][hI][hB] (hB > 0)
            ll maxFirst = dp[i + 1][0][hI];

            for(int x = 1 ; x >= 0 ; x--)
                maxSuffix[x] = max( maxSuffix[x + 1] , dp[i + 1][x][hI] + s[i][hI + 1] - s[i][x + 1] );

            for(int hB = 1 ; hB <= 1 ; hB++)
            {
                ll& ans = dp[i][hI][hB];

                maxFirst = max( maxFirst , dp[i + 1][hB][hI] );

                if( hB <= hI )
                {
                    ans = dp[i][hI][0];
                    continue;
                }

                ans = max( maxFirst + s[i][hI + 1] - s[i][hB + 1] , maxSuffix[hB + 1] );
            }
        }
    }

    ll ans = 0;

    for(int i = 0 ; i <= 1 ; i++)
        ans = max( ans , dp[1][i][0] );

    return ans;
}

Compilation message

fish.cpp: In function 'long long int max_weights(int, int, std::vector<int>, std::vector<int>, std::vector<int>)':
fish.cpp:59:86: warning: iteration 1 invokes undefined behavior [-Waggressive-loop-optimizations]
   59 |                 maxSuffix[x] = max( maxSuffix[x + 1] , dp[i + 1][x][hI] + s[i][hI + 1] - s[i][x + 1] );
      |                                                                           ~~~~~~~~~~~^
fish.cpp:43:29: note: within this loop
   43 |         for(int hI = 0 ; hI <= 1 ; hI++)
      |                          ~~~^~~~
fish.cpp:37:59: warning: array subscript 2 is above array bounds of 'll [2]' {aka 'long long int [2]'} [-Warray-bounds]
   37 |                 dp[n][hI][hB] = s[n][hI + 1] - s[n][hB + 1];
      |                                                ~~~~~~~~~~~^
fish.cpp:52:100: warning: array subscript 2 is above array bounds of 'll [2]' {aka 'long long int [2]'} [-Warray-bounds]
   52 |                     dp[i][hI][0] = max( dp[i][hI][0] , dp[i + 1][x][hI] + s[i][hI + 1] - s[i][x + 1] );
      |                                                                                          ~~~~~~~~~~^
fish.cpp:59:100: warning: array subscript 2 is above array bounds of 'll [2]' {aka 'long long int [2]'} [-Warray-bounds]
   59 |                 maxSuffix[x] = max( maxSuffix[x + 1] , dp[i + 1][x][hI] + s[i][hI + 1] - s[i][x + 1] );
      |                                                                                          ~~~~~~~~~~^

Subtask #1
0 / 3.0

# Verdict Execution time Memory Grader output
1 Runtime error 28 ms 4172 KB Execution killed with signal 11
2 Halted 0 ms 0 KB -

Subtask #2
0 / 6.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 212 KB 1st lines differ - on the 1st token, expected: '2', found: '1'
2 Halted 0 ms 0 KB -

Subtask #3
0 / 9.0

# Verdict Execution time Memory Grader output
1 Runtime error 1 ms 340 KB Execution killed with signal 11
2 Halted 0 ms 0 KB -

Subtask #4
0 / 14.0

# Verdict Execution time Memory Grader output
1 Incorrect 0 ms 212 KB 1st lines differ - on the 1st token, expected: '3', found: '1'
2 Halted 0 ms 0 KB -

Subtask #5
0 / 21.0

# Verdict Execution time Memory Grader output
1 Incorrect 0 ms 212 KB 1st lines differ - on the 1st token, expected: '3', found: '1'
2 Halted 0 ms 0 KB -

Subtask #6
0 / 17.0

# Verdict Execution time Memory Grader output
1 Incorrect 0 ms 212 KB 1st lines differ - on the 1st token, expected: '3', found: '1'
2 Halted 0 ms 0 KB -

Subtask #7
0 / 14.0

# Verdict Execution time Memory Grader output
1 Runtime error 1 ms 340 KB Execution killed with signal 11
2 Halted 0 ms 0 KB -

Subtask #8
0 / 16.0

# Verdict Execution time Memory Grader output
1 Runtime error 28 ms 4172 KB Execution killed with signal 11
2 Halted 0 ms 0 KB -