This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
using namespace std;
int n;
long long l, x[202], t[202], dp[202][201][201][2];
int main(){
cin >> n >> l;
for(int i = 1; i <= n; i++){
cin >> x[i];
}
for(int i = 1; i <= n; i++){
cin >> t[i];
}
for(int i = 1; i <= n + 1; i++){
for(int j = 0; j <= n; j++){
for(int t = 0; t <= n; t++){
dp[i][j][t][0] = 1e9 + 1;
dp[i][j][t][1] = 1e9 + 1;
}
}
}
x[n + 1] = l;
dp[n + 1][0][0][0] = 0;
dp[n + 1][0][0][1] = 0;
for(int i = n + 1; i >= 1; i--){
for(int j = 0; j <= n; j++){
for(int o = 0; o <= min((n + 1) - i + j, n); o++){
if(dp[i][j][o][0] < 1e9){
if(i - 1 > j && x[j] + (l - x[i - 1]) <= 1e9){
dp[i - 1][j][o + (x[j] + (l - x[i - 1]) + dp[i][j][o][0] <= t[i - 1])][1] = min(dp[i - 1][j][o + (x[j] + (l - x[i - 1]) + dp[i][j][o][0] <= t[i - 1])][1], x[j] + (l - x[i - 1]) + dp[i][j][o][0]);
}
if(j + 1 < i){
dp[i][j + 1][o + (x[j + 1] - x[j] + dp[i][j][o][0] <= t[j + 1])][0] = min(x[j + 1] - x[j] + dp[i][j][o][0], dp[i][j + 1][o + (x[j + 1] - x[j] + dp[i][j][o][0] <= t[j + 1])][0]);
}
}
if(dp[i][j][o][1] < 1e9){
if(i - 1 > j){
dp[i - 1][j][o + ((x[i] - x[i - 1]) + dp[i][j][o][1] <= t[i - 1])][1] = min(dp[i - 1][j][o + ((x[i] - x[i - 1]) + dp[i][j][o][1] <= t[i - 1])][1], (x[i] - x[i - 1]) + dp[i][j][o][1]);
}
if(j + 1 < i && (l - x[i]) + x[j + 1] <= 1e9){
dp[i][j + 1][o + ((l - x[i]) + x[j + 1] + dp[i][j][o][1] <= t[j + 1])][0] = min((l - x[i]) + x[j + 1] + dp[i][j][o][1], dp[i][j + 1][o + ((l - x[i]) + x[j + 1] + dp[i][j][o][1] <= t[j + 1])][0]);
}
}
}
}
}
int ans = 0;
for(int i = n + 1; i >= 1; i--){
for(int j = 0; j <= n; j++){
for(int o = 0; o <= min((n + 1) - i + j, n); o++){
if(dp[i][j][o][0] != 1e9 + 1 || dp[i][j][o][1] != 1e9 + 1){
//cout << i << " " << j << " " << o << " " << dp[i][j][o][0] << " " << dp[i][j][o][1] << '\n';
ans = max(o, ans);
}
}
}
}
cout << ans;
}
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