Submission #2947241

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Source Code Expand

#include<bits/stdc++.h>
#define rep(i,a,b) for(int i=a;i<b;i++)
#define rrep(i,a,b) for(int i=a;i>=b;i--)
#define fore(i,a) for(auto &i:a)
#define all(x) (x).begin(),(x).end()
#pragma GCC optimize ("-O3")
using namespace std; void _main(); int main() { cin.tie(0); ios::sync_with_stdio(false); _main(); }
typedef long long ll; const int inf = INT_MAX / 2; const ll infl = 1LL << 60;
template<class T>bool chmax(T &a, const T &b) { if (a<b) { a = b; return 1; } return 0; }
template<class T>bool chmin(T &a, const T &b) { if (b<a) { a = b; return 1; } return 0; }
//---------------------------------------------------------------------------------------------------
/*---------------------------------------------------------------------------------------------------
　　　　　　　　　　　 ∧＿∧  
　　　　　 ∧＿∧ 　（´<_｀ ）　 Welcome to My Coding Space!
　　　　 （ ´_ゝ`）　/　 ⌒i     
　　　　／　　　＼　 　  |　|     
　　　 /　　 /￣￣￣￣/　　|  
　 ＿_(__ﾆつ/　    ＿/ .| .|＿＿＿＿  
　 　　　＼/＿＿＿＿/　（u　⊃  
---------------------------------------------------------------------------------------------------*/







int H, W;
string S[2010];
int dx[4] = { 0, 1, 0, -1 }, dy[4] = { -1, 0, 1, 0 };
//---------------------------------------------------------------------------------------------------
int vis[2010][2010], vis2[2010][2010];
ll memo[2010][2010], memo2[2010][2010];
ll dp(int x, int y, int d) {
    if (vis[y][x]) return memo[y][x];

    int xx = x + dx[d], yy = y + dy[d];
    if (0 <= xx and xx < W and 0 <= yy and yy < H) {
        if (S[y][x] == '.' and S[yy][xx] == '.') {
            vis[y][x] = 1;
            return memo[y][x] = dp(xx, yy, d) + 1;
        }
    }

    vis[y][x] = 1;
    return memo[y][x] = 0;
}
ll dp2(int x, int y, int d) {
    if (vis2[y][x]) return memo2[y][x];

    int xx = x + dx[d], yy = y + dy[d];
    if (0 <= xx and xx < W and 0 <= yy and yy < H) {
        if (S[y][x] == '.' and S[yy][xx] == '.') {
            vis2[y][x] = 1;
            return memo2[y][x] = dp2(xx, yy, d) + dp(xx, yy, (d + 3) % 4);
        }
    }

    vis2[y][x] = 1;
    return memo2[y][x] = 0;
}
//---------------------------------------------------------------------------------------------------
void _main() {
    cin >> H >> W;
    rep(y, 0, H) cin >> S[y];

    ll ans = 0;
    rep(d, 0, 4) {
        rep(y, 0, H) rep(x, 0, W) vis[y][x] = vis2[y][x] = 0;
        rep(y, 0, H) rep(x, 0, W) ans += dp2(x, y, d);
    }

    cout << ans << endl;
}

Submission Info

Judge Result