int solve(){ MaxQueue Q; for (int i = 1; i <= K; i++){ if (d[i] == 1){ for (int y = 1; y <= M; y++){ Q.clear(); for (int x = N, ii = 1; x >= 1; x--, ii++){ while(Q.size() > t[i] - s[i] + 1) Q.pop(); if (grid[x][y] == 'x'){Q.clear(); continue;} dp[i][x][y] = dp[i - 1][x][y]; if (Q.size()) dp[i][x][y] = max(dp[i][x][y], Q.max() + ii); if (dp[i - 1][x][y]) Q.push(dp[i - 1][x][y] - ii); else Q.push(-0x1f1f1f1f); } } }else if (d[i] == 2){ for (int y = 1; y <= M; y++){ Q.clear(); for (int x = 1, ii = 1; x <= N; x++, ii++){ while(Q.size() > t[i] - s[i] + 1) Q.pop(); if (grid[x][y] == 'x'){Q.clear(); continue;} dp[i][x][y] = dp[i - 1][x][y]; if (Q.size()) dp[i][x][y] = max(dp[i][x][y], Q.max() + ii); if (dp[i - 1][x][y]) Q.push(dp[i - 1][x][y] - ii); else Q.push(-0x1f1f1f1f); } } }else if (d[i] == 3){ for (int x = 1; x <= N; x++){ Q.clear(); for (int y = M, ii = 1; y >= 1; y--, ii++){ while(Q.size() > t[i] - s[i] + 1) Q.pop(); if (grid[x][y] == 'x'){Q.clear(); continue;} dp[i][x][y] = dp[i - 1][x][y]; if (Q.size()) dp[i][x][y] = max(dp[i][x][y], Q.max() + ii); if (dp[i - 1][x][y]) Q.push(dp[i - 1][x][y] - ii); else Q.push(-0x1f1f1f1f); } } }else if (d[i] == 4){ for (int x = 1; x <= N; x++){ Q.clear(); for (int y = 1, ii = 1; y <= M; y++, ii++){ //cout << Q.size() << ", " << t[i] << ", " << s[i] << "=>" << (Q.size() ? Q.max(): 0) << endl; while(Q.size() > t[i] - s[i] + 1) Q.pop(); if (grid[x][y] == 'x'){Q.clear(); continue;} dp[i][x][y] = dp[i - 1][x][y]; if (Q.size()) dp[i][x][y] = max(dp[i][x][y], Q.max() + ii); if (dp[i - 1][x][y]) Q.push(dp[i - 1][x][y] - ii); else Q.push(-0x1f1f1f1f); } } } } int ans = 0; for (int x = 1; x <= N; x++){ for (int y = 1; y <= M; y++){ ans = max(ans, dp[K][x][y]); } } return ans - 1; }