Submission #377169

#	Time	Username	Problem	Language	Result	Execution time	Memory
377169		smjleo	Dango Maker (JOI18_dango_maker)	C++14	0 / 100	1 ms	384 KiB

dango_maker

#include <bits/stdc++.h>
#pragma GCC optimize("Ofast")
#pragma GCC target("avx,avx2,fma")
using namespace std;
#define int long long
#define nl '\n'
#define io ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0)
const int mod = 1000000007, mod2 = 998244353;

// change this
const int N = 3005;

int n, m, h[N][N], w[N][N];
char arr[N][N];

bool checkh(int i, int j) {
    if (j < 3) return false;
    return (arr[i][j-2] == 'R' && arr[i][j-1] == 'G' && arr[i][j] == 'W');
}

bool checkv(int i, int j) {
    if (i < 3) return false;
    return (arr[i-2][j] == 'R' && arr[i-1][j] =='G' && arr[i][j] == 'W');
}

int conf(int i, int j) {
    if (i < 3 or j < 3) return 0;
    
    vector< vector<int> > check = {
        {i-2, j-1, i-1, j-2},
        {i-2, j, i-1, j-1},
        {i-1, j-1, i, j-2},
        {i-1, j, i, j-1},
        {i-2, j, i, j-2}
    };

    for (auto x : check) {
        // check h change
        int hc = h[x[0]][x[1]] - h[x[0]-1][x[1]] - h[x[0]][x[1]-1] + h[x[0]-1][x[1]-1];
        // check w change
        int wc = w[x[2]][x[3]] - w[x[2]-1][x[3]] - w[x[2]][x[3]-1] + w[x[2]-1][x[3]-1];

        if (hc && wc) return -1;
    }

    return 0;
}

signed main() {
    io;
    cin >> n >> m;
    for (int i=1; i<=n; i++) {
        for (int j=1; j<=m; j++) {
            cin >> arr[i][j];
            
            h[i][j] = (h[i-1][j] + h[i][j-1] - h[i-1][j-1]) + conf(i, j);
            w[i][j] = (w[i-1][j] + w[i][j-1] - w[i-1][j-1]);

            if (checkh(i, j)) {
                int nh = 1 + h[i][j-3] + h[i-1][j] - h[i-1][j-3];
                int nw = w[i][j-3] + w[i-1][j] - w[i-1][j-3];
                if (nh + nw > h[i][j] + w[i][j]) {
                    h[i][j] = nh;
                    w[i][j] = nw;
                }
            }
            if (checkv(i, j)) {
                int nh = h[i-3][j] + h[i][j-1] - h[i-3][j-1];
                int nw = 1 + w[i-3][j] + w[i][j-1] - w[i-3][j-1];
                if (nh + nw > h[i][j] + w[i][j]) {
                    h[i][j] = nh;
                    w[i][j] = nw;
                }
            }
            // cout << h[i][j] + w[i][j] << ' ';
        }
        // cout << nl;
    }

    cout << h[n][m] + w[n][m] << nl;
}

• Subtask 1: 0 / 13
• Subtask 2: 0 / 20
• Subtask 3: 0 / 67