Submission #832438

#	Time	Username	Problem	Language	Result	Execution time	Memory
832438		rnl42	Catfish Farm (IOI22_fish)	C++17	0 / 100	1064 ms	2097152 KiB

fish

#include "fish.h"
#include <vector>
#include <algorithm>
#include <iostream>
using namespace std;
#define int long long

using piii = pair<int,pair<int,int>>;

#ifdef DEBUG
#define dbg(x) cerr << "(" #x ") = " << x << '\n'
#define dbgln() cerr << '\n'
#else
#define dbg(x) void(0)
#define dbgln(x) void(0)
#endif

int max_weights(signed N, signed M, vector<signed> X, vector<signed> Y, vector<signed> W) {
    vector<vector<int>> grid(N, vector<int>(N+2));
    vector<vector<int>> cumulsum(N, vector<int>(N+2));
    for (int i = 0; i < M; i++) grid[X[i]][Y[i]] = W[i];
    for (int x = 0; x < N; x++) {
        for (int y = 0; y <= N; y++) {
            cumulsum[x][y+1] = cumulsum[x][y]+grid[x][y];
        }
    }
    vector<vector<int>> best_asc(N, vector<int>(N+2)), best_desc(N, vector<int>(N+2));
    for (int y = 0; y <= N+1; y++) {
        best_asc[0][y] = cumulsum[0][y+1];
    }
    for (int x = 1; x < N; x++) {
        vector<int> best_for_desc(N+3);
        for (int y = N+1; y >= 0; y--) {
            best_for_desc[y] = max(best_for_desc[y+1], best_desc[x-1][y]+cumulsum[x][y]);
        }
        int best_for_asc = 0;
        for (int y = 0; y <= N+1; y++) {
            best_for_asc = max(best_for_asc, best_asc[x-1][y]+cumulsum[x].back()-cumulsum[x][y+1]);
            
            best_asc[x][y] = cumulsum[x][y+1];
            if (y <= N) best_asc[x][y] = max(best_asc[x][y], cumulsum[x][y+1]+best_desc[x-1][y+1]);
            best_asc[x][y] = max(best_asc[x][y], best_for_asc-(cumulsum[x].back()-cumulsum[x][y+1]));

            if (x >= 2) {
                best_desc[x][y] = max(best_desc[x][y], best_desc[x-2][N]);
            }
            if (x >= 3) {
                best_desc[x][y] = max(best_desc[x][y], best_desc[x-3][N]);
            }
            best_desc[x][y] = max(best_desc[x][y], best_for_desc[y]);
        }
    }

    for (int x = 0; x < N; x++) {
        for (int y = 0; y <= N; y++) {
            dbg(x);
            dbg(y);
            dbg(best_asc[x][y]);
            dbg(best_desc[x][y]);
            dbgln(), dbgln();
        }
    }
    
    return max(best_desc[N-1][0], best_asc[N-2][N]);
}

• 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