| # | Submission time | Handle | Problem | Language | Result | Execution time | Memory |
|---|---|---|---|---|---|---|---|
| 99952 | 2019-03-08T22:06:38 Z | MvC | Shortcut (IOI16_shortcut) | C++11 | 0 ms | 0 KB |
#include "shortcut.h"
#include<bits/stdc++.h>
using namespace std;
#define ll long long
const int maxn = 3000 + 5;
const ll inf = 1e15;
int n;
ll cost, len[maxn], val[maxn];
ll pos[maxn];
bool check(ll k) {
// printf("check %lld\n",k);
ll r1 = -inf, r2 = inf, c1 = -inf, c2 = inf;
for(int x=0;x<n;x++) {
for(int y=x+1;y<n;y++) {
if(val[x] + val[y] + pos[y] - pos[x] <= k) continue;
ll d = k - cost - val[x] - val[y];
r1 = max(r1, pos[x] + pos[y] - d);
c1 = max(c1, -pos[x] + pos[y] - d);
r2 = min(r2, pos[x] + pos[y] + d);
c2 = min(c2, -pos[x] + pos[y] + d);
}
}
for(int x=0;x<n;x++) {
for(int y=x+1;y<n;y++) {
ll r = (pos[x]+pos[y]), c = (-pos[x]+pos[y]);
if(r1 <= r && r <= r2 && c1 <= c && c <= c2) return 1;
}
}
return 0;
}
ll find_shortcut(int N, vector<int> l, vector<int> d, int c) {
n = N; cost = c;
for(int i=0;i<n-1;i++) len[i] = l[i];
for(int i=0;i<n;i++) val[i] = d[i];
for(int i=0;i<n-1;i++) pos[i+1] = pos[i] + len[i];
ll l = 0, r = inf, mid, res = -1;
while(l<=r) {
mid = (l+r)/2;
if(check(mid)) {
res = mid;
r = mid-1;
}
else l = mid+1;
}
return res;
}