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https://git.sb/baoshuo/OI-codes.git
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108
Luogu/P2254/P2254.cpp
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108
Luogu/P2254/P2254.cpp
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#include <iostream>
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#include <deque>
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using std::cin;
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using std::cout;
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const char endl = '\n';
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const int N = 205;
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int n, m, x, y, k, s, t, d, f[N][N], ans;
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bool g[N][N];
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int main() {
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std::ios::sync_with_stdio(false);
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cin.tie(nullptr);
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cin >> n >> m >> x >> y >> k;
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for (int i = 1; i <= n; i++) {
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for (int j = 1; j <= m; j++) {
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char c;
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cin >> c;
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g[i][j] = c == 'x';
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f[i][j] = -0x3f3f3f3f;
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}
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}
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f[x][y] = 0;
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for (int i = 1; i <= k; i++) {
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cin >> s >> t >> d;
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int len = t - s + 1;
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switch (d) {
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case 1: { // 上
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for (int y = 1; y <= m; y++) {
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std::deque<std::pair<int, int>> q;
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for (int j = 1, x = n; x; j++, x--) {
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if (g[x][y]) {
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q.clear();
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} else {
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while (!q.empty() && q.back().second < f[x][y] - j) q.pop_back();
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q.push_back(std::make_pair(j, f[x][y] - j));
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while (!q.empty() && j - q.front().first > len) q.pop_front();
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f[x][y] = q.front().second + j;
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ans = std::max(ans, f[x][y]);
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}
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}
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}
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break;
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}
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case 2: { // 下
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for (int y = 1; y <= m; y++) {
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std::deque<std::pair<int, int>> q;
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for (int j = 1, x = 1; x <= n; j++, x++) {
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if (g[x][y]) {
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q.clear();
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} else {
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while (!q.empty() && q.back().second < f[x][y] - j) q.pop_back();
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q.push_back(std::make_pair(j, f[x][y] - j));
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while (!q.empty() && j - q.front().first > len) q.pop_front();
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f[x][y] = q.front().second + j;
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ans = std::max(ans, f[x][y]);
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}
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}
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}
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break;
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}
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case 3: { // 左
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for (int x = 1; x <= n; x++) {
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std::deque<std::pair<int, int>> q;
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for (int j = 1, y = m; y; j++, y--) {
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if (g[x][y]) {
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q.clear();
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} else {
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while (!q.empty() && q.back().second < f[x][y] - j) q.pop_back();
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q.push_back(std::make_pair(j, f[x][y] - j));
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while (!q.empty() && j - q.front().first > len) q.pop_front();
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f[x][y] = q.front().second + j;
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ans = std::max(ans, f[x][y]);
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}
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}
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}
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break;
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}
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case 4: { // 右
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for (int x = 1; x <= n; x++) {
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std::deque<std::pair<int, int>> q;
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for (int j = 1, y = 1; y <= m; j++, y++) {
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if (g[x][y]) {
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q.clear();
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} else {
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while (!q.empty() && q.back().second < f[x][y] - j) q.pop_back();
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q.push_back(std::make_pair(j, f[x][y] - j));
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while (!q.empty() && j - q.front().first > len) q.pop_front();
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f[x][y] = q.front().second + j;
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ans = std::max(ans, f[x][y]);
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}
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}
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}
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break;
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}
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}
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}
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cout << ans << endl;
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return 0;
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}
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