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;
typedef long long ll;
const ll N = 205;
ll n, l;
ll cl[N], ccl[N], t[N], idx[N];
void read() {
cin >> n >> l;
cl[0] = ccl[0] = 0;
for(int i = 0; i < n; i++) {
cin >> cl[i];
ccl[i] = l - cl[i];
idx[i] = i;
}
for(int i = 0; i < n; i++)
cin >> t[i];
}
struct state {
int l, r, cnt; bool dir;
bool operator<(const state& ot) const {
return cnt < ot.cnt;
}
};
void solve() {
priority_queue<pair<ll, state>, vector<pair<ll, state>>, greater<pair<ll, state>>> pq;
ll dist[n+1][n+1][n+1][2];
bool vis[n+1][n+1][n+1][2];
for(int i = 0; i < n; i++) {
for(int j = 0; j < n; j++) {
for(int k = 0; k < n; k++) {
dist[i][j][k][0] = dist[i][j][k][1] = 1e15;
vis[i][j][k][0] = vis[i][j][k][1] = 0;
}
}
}
int ans = 0;
pq.push({0, {0, n-1, 0, 0}});
dist[0][n-1][0][0] = 0;
while(!pq.empty()) {
state u = pq.top().second; pq.pop();
if(u.l > u.r) {
ans = max(ans, u.cnt);
continue;
} else if(!vis[u.l][u.r][u.cnt][u.dir]) {
vis[u.l][u.r][u.cnt][u.dir] = 1;
// cerr << u.l << ' ' << u.r << ' ' << u.cnt << ' ' << u.dir << '\n';
// cerr << dist[u.l][u.r][u.cnt][u.dir] << '\n';
ll cost, total;
if(u.dir == 0) {
cost = ((u.l==0)?0:-cl[u.l-1]) + cl[u.l];
total = dist[u.l][u.r][u.cnt][u.dir] + cost;
if(dist[u.l+1][u.r][u.cnt + (total <= t[u.l])][0] > total) {
dist[u.l+1][u.r][u.cnt + (total <= t[u.l])][0] = total;
pq.push({dist[u.l+1][u.r][u.cnt + (total <= t[u.l])][0], {u.l+1, u.r, u.cnt + (total <= t[u.l]), 0}});
}
cost = ((u.l==0)?0:cl[u.l-1]) + ccl[u.r];
total = dist[u.l][u.r][u.cnt][u.dir] + cost;
if(dist[u.l][u.r-1][u.cnt + (total <= t[u.r])][1] > total) {
dist[u.l][u.r-1][u.cnt + (total <= t[u.r])][1] = total;
pq.push({dist[u.l][u.r-1][u.cnt + (total <= t[u.r])][1], {u.l, u.r-1, u.cnt + (total <= t[u.r]), 1}});
}
} else {
cost = ((u.r==n-1)?0:-ccl[u.r+1]) + ccl[u.r];
total = dist[u.l][u.r][u.cnt][u.dir] + cost;
if(dist[u.l][u.r-1][u.cnt + (total <= t[u.r])][1] > total) {
dist[u.l][u.r-1][u.cnt + (total <= t[u.r])][1] = total;
pq.push({dist[u.l][u.r-1][u.cnt + (total <= t[u.r])][1], {u.l, u.r-1, u.cnt + (total <= t[u.r]), 1}});
}
cost = ((u.r==n-1)?0:ccl[u.r+1]) + cl[u.l];
total = dist[u.l][u.r][u.cnt][u.dir] + cost;
if(dist[u.l+1][u.r][u.cnt + (total <= t[u.l])][0] > total) {
dist[u.l+1][u.r][u.cnt + (total <= t[u.l])][0] = total;
pq.push({dist[u.l+1][u.r][u.cnt + (total <= t[u.l])][0], {u.l+1, u.r, u.cnt + (total <= t[u.l]), 0}});
}
}
}
}
cout << ans << '\n';
}
int main() {
ios::sync_with_stdio(0); cin.tie(0);
read();
solve();
return 0;
}
Compilation message (stderr)
ho_t3.cpp: In function 'void solve()':
ho_t3.cpp:41:19: warning: narrowing conversion of '(n - 1)' from 'll {aka long long int}' to 'int' inside { } [-Wnarrowing]
pq.push({0, {0, n-1, 0, 0}});
~^~
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