Submission #815355

#TimeUsernameProblemLanguageResultExecution timeMemory
815355Charizard2021Collecting Stamps 3 (JOI20_ho_t3)C++17
0 / 100
0 ms212 KiB
#include <bits/stdc++.h> using namespace std; int main(){ int n, l; cin >> n >> l; int x[1 + n]; int t[1 + n]; for (int i = 1; i <= n; i++){ cin >> x[i]; } for (int i = 1; i <= n; i++){ cin >> t[i]; } int dp[n][n][n][2]; for (int i = 0; i < n; i++){ for (int j = 0; j < n; j++){ for (int k = 0; k < n; k++){ dp[i][j][k][0] = INT_MAX; dp[i][j][k][1] = INT_MAX; } } } int val = abs(x[1]); val = min(val, abs(val - l)); dp[1][n + 1][val <= t[1]][0] = val; int val2 = abs(x[n]); val2 = min(val2, abs(val2 - l)); dp[0][n][val2 <= t[n]][1] = val2; for (int sum = 2; sum <= n; sum++){ for (int i = 0; i < sum; i++){ int j = sum - 1 - i; j = n + 1 - (sum - 1 - i); for(int k = 0; k < sum; k++){ if(i != 0){ int val4 = abs(x[i] - x[i + 1]); val4 = min(val4, abs(val4 - l)); int val3 = dp[i][j][k][0] + val4; dp[i + 1][j][k + (val3 <= t[i + 1])][0] = min(dp[i + 1][j][k + (val3 <= t[i + 1])][0], val3); int val6 = abs(x[i] - x[j - 1]); val6 = min(val6, abs(val6 - l)); int val5 = dp[i][j][k][0] + val6; dp[i][j - 1][k + (val5 <= t[j - 1])][1] = min(dp[i][j - 1][k + (val5 <= t[j - 1])][1], val5); } if(i + 1 != sum){ int val4 = abs(x[j] - x[i + 1]); val4 = min(val4, abs(val4 - l)); int val3 = dp[i][j][k][1] + val4; dp[i + 1][j][k + (val3 <= t[i + 1])][0] = min(dp[i + 1][j][k + (val3 <= t[i + 1])][0], val3); int val6 = abs(x[j] - x[j - 1]); val6 = min(val6, abs(val6 - l)); int val5 = dp[i][j][k][1] + val6; dp[i][j - 1][k + (val5 <= t[j - 1])][1] = min(dp[i][j - 1][k + (val5 <= t[j - 1])][1], val5); } } } } int ans = 0; for (int i = 0; i < n; i++){ for (int j = 0; j < n; j++){ for (int k = 0; k < n; k++){ for (int l = 0; l < 2; l++){ if (dp[i][j][k][l] != INT_MAX){ ans = max(ans, k); } } } } } cout << ans << "\n"; }
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