#include <bits/stdc++.h>
using namespace std;
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace __gnu_pbds;
template<typename T> using ordered_set = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
template<typename T, typename U> using ordered_map = tree<T, U, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
typedef long long ll;
typedef long double ld;
typedef pair<int,int> pii;
typedef pair<ll,ll> pll;
typedef vector<int> vi;
typedef vector<ll> vll;
#define FOR(i,j,k,in) for(int i=(j); i < (k);i+=in)
#define FORD(i,j,k,in) for(int i=(j); i >=(k);i-=in)
#define REP(i,b) FOR(i,0,b,1)
#define REPD(i,b) FORD(i,b,0,1)
#define pb push_back
#define mp make_pair
#define ff first
#define ss second
#define all(x) begin(x), end(x)
#define MANY_TESTS int tcase; cin >> tcase; while(tcase--)
const double EPS = 1e-9;
const int MOD = 1e9+7;
const ll INFF = 1e18;
const int INF = 1e9;
const ld PI = acos((ld)-1);
const vi dy = {1, 0, -1, 0, -1, 1, 1, -1};
const vi dx = {0, 1, 0, -1, -1, 1, -1, 1};
void DBG(){cout << "]" << endl;}
template<typename T, typename ...U> void DBG(const T& head, const U... args){ cout << head << "; "; DBG(args...); }
#define dbg(...) cout << "Line(" << __LINE__ << ") -> [" << #__VA_ARGS__ << "]: [", DBG(__VA_ARGS__);
#define chk() cout << "Check at line(" << __LINE__ << ") hit." << endl;
template<class T, unsigned int U>
ostream& operator<<(ostream& out, const array<T, U> &v){out << "["; REP(i, U) out << v[i] << ", "; out << "]"; return out;}
template <class T, class U>
ostream& operator<<(ostream& out, const pair<T, U> &par) {out << "[" << par.first << ";" << par.second << "]"; return out;}
template <class T>
ostream& operator<<(ostream& out, const set<T> &cont) { out << "{"; for( const auto &x:cont) out << x << ", "; out << "}"; return out; }
template <class T, class U>
ostream& operator<<(ostream& out, const map<T, U> &cont) {out << "{"; for( const auto &x:cont) out << x << ", "; out << "}"; return out; }
template<class T>
ostream& operator<<(ostream& out, const vector<T> &v){ out << "["; REP(i, v.size()) out << v[i] << ", "; out << "]"; return out;}
template<class T>
istream& operator>>(istream& in, vector<T> &v){ for(auto &x : v) in >> x; return in; }
int main(){
ios_base::sync_with_stdio(false);
cin.tie(NULL); cout.tie(NULL);
int n, k; ll t;
cin >> n >> k >> t;
k--;
vector<ll> x(n);
cin >> x;
REP(i, n) x[i] *= 2;
auto check = [&](ll s) -> bool{
int left = k - 1;
int right = k + 1;
ll curr_pos = x[k];
ll curr_t = t * s;
vector<ll> nx = x;
REP(i, n - 1){
if(right == n || (left != -1 && abs(curr_pos - nx[left]) < abs(curr_pos - nx[right]))){
ll diff = abs(curr_pos - nx[left]) / 2;
left--;
if(diff > curr_t)
return false;
curr_t -= diff;
curr_t += t * s;
curr_pos += diff;
REP(j, n){
if(nx[j] < curr_pos){
if(abs(nx[j] - curr_pos) > diff){
nx[j] += diff;
}
else{
nx[j] = curr_pos;
}
}
else{
if(abs(nx[j] - curr_pos) > diff){
nx[j] -= diff;
}
else{
nx[j] = curr_pos;
}
}
}
}
else{
ll diff = abs(curr_pos - nx[right]) / 2;
right++;
if(diff > curr_t)
return false;
curr_t -= diff;
curr_t += t * s;
curr_pos += diff;
REP(j, n){
if(nx[j] < curr_pos){
if(abs(nx[j] - curr_pos) > diff){
nx[j] += diff;
}
else{
nx[j] = curr_pos;
}
}
else{
if(abs(nx[j] - curr_pos) > diff){
nx[j] -= diff;
}
else{
nx[j] = curr_pos;
}
}
}
}
}
return true;
};
ll ans = INF;
ll l = 1;
ll r = (ll)2e9 / t + 100;
while(l <= r){
ll mid = (l + r) >> 1;
if(check(mid)){
ans = mid;
r = mid - 1;
}
else{
l = mid + 1;
}
}
cout << ans / 2 + ans%2 <<"\n";
return 0;
}
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
1 ms |
364 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
1 ms |
364 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
1 ms |
364 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
