Submission #307901

#	Time	Username	Problem	Language	Result	Execution time	Memory
307901		HynDuf	Dango Maker (JOI18_dango_maker)	C++11	100 / 100	269 ms	27132 KiB

dango_maker

#include <bits/stdc++.h>

#define task "D"
#define all(v) (v).begin(), (v).end()
#define rep(i, l, r) for (int i = (l); i <= (r); ++i)
#define Rep(i, r, l) for (int i = (r); i >= (l); --i)
#define DB(X) { cerr << #X << " = " << (X) << '\n'; }
#define DB1(A, _) { cerr << #A << "[" << _ << "] = " << (A[_]) << '\n'; }
#define DB2(A, _, __) { cerr << #A << "[" << _ << "][" << __ << "] = " << (A[_][__]) << '\n'; }
#define DB3(A, _, __, ___) { cerr << #A << "[" << _ << "][" << __ << "][" << ___ << "] = " << (A[_][__][___]) << '\n'; }
#define PR(A, l, r) { cerr << '\n'; rep(_, l, r) DB1(A, _); cerr << '\n';}
#define SZ(x) ((int)(x).size())
#define pb push_back
#define eb emplace_back
#define pf push_front
#define F first
#define S second
#define by(x) [](const auto& a, const auto& b) { return a.x < b.x; } // sort(arr, arr + N, by(a));
#define next ___next
#define prev ___prev
#define y1 ___y1
#define left ___left
#define right ___right
#define y0 ___y0
#define div ___div
#define j0 ___j0
#define jn ___jn

using ll = long long;
using ld = long double;
using ull = unsigned long long;
using namespace std;
typedef pair<int, int> ii;
typedef pair<ii, int> iii;
typedef vector<int> vi;
typedef vector<ii> vii;
typedef vector<ll> vl;
const int N = 3002;
int n, m, dp[N][3];
bool up[N][N], ri[N][N];
string s[N];
int main()
{
#ifdef HynDuf
    freopen(task".in", "r", stdin);
    //freopen(task".out", "w", stdout);
#else
    ios_base::sync_with_stdio(false); cin.tie(nullptr);
#endif
    cin >> n >> m;
    rep(i, 1, n)
    {
        cin >> s[i];
        s[i] = '0' + s[i];
    }
    rep(i, 1, n) rep(j, 1, m)
    {
        if (i > 1 && i < n) up[i][j] = (s[i][j] == 'G' && s[i - 1][j] == 'R' && s[i + 1][j] == 'W');
        if (j > 1 && j < m) ri[i][j] = (s[i][j] == 'G' && s[i][j - 1] == 'R' && s[i][j + 1] == 'W');
    }
    int ans = 0;
    rep(diag, 2, m)
    {
        int i = 1, j = diag;
        rep(t, 1, n)
        {
            if (up[i][j]) dp[t][1] = max(dp[t - 1][0], dp[t - 1][1]) + 1;
            else dp[t][1] = 0;
            if (ri[i][j]) dp[t][2] = max(dp[t - 1][0], dp[t - 1][2]) + 1;
            else dp[t][2] = 0;
            dp[t][0] = max({dp[t - 1][0], dp[t - 1][1], dp[t - 1][2]});
            if (i == n || j == 1)
            {
                ans += max({dp[t][0], dp[t][1], dp[t][2]});
                break;
            }
            i++, j--;
        }
    }
    rep(diag, 2, n)
    {
        int i = diag, j = m;
        rep(t, 1, n)
        {
            if (up[i][j]) dp[t][1] = max(dp[t - 1][0], dp[t - 1][1]) + 1;
            else dp[t][1] = 0;
            if (ri[i][j]) dp[t][2] = max(dp[t - 1][0], dp[t - 1][2]) + 1;
            else dp[t][2] = 0;
            dp[t][0] = max({dp[t - 1][0], dp[t - 1][1], dp[t - 1][2]});
            if (i == n || j == 1)
            {
                ans += max({dp[t][0], dp[t][1], dp[t][2]});
                break;
            }
            i++, j--;
        }
    }
    cout << ans;
    return 0;
}

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