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#include <bits/stdc++.h>
//#pragma GCC optimize("O3")
//#pragma GCC optimize("Ofast,no-stack-protector")
//#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx")
//#pragma GCC target("avx,tune=native")
//float __attribute__((aligned(32)))
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;
int mysqrt(ll x){
int l = 0, r = 1e9 + 1;
while (r - l > 1){
int m = (l + r) / 2;
if (m * (ll)m <= x)
l = m;
else
r = m;
}
return l;
}
mt19937 rnd(1337);
ll AR = 19, BR = 13, CR = 23, XR = 228, YR = 322, MODR = 1e9 + 993;
ll myrand(){
ll ZR = (XR * AR + YR * BR + CR) % MODR;
XR = YR;
YR = ZR;
return ZR;
}
const int Mod = 1e9 + 7;
int bpow(int x, int y){
if (y == 0)
return 1;
if (y == 1)
return x;
int ret = bpow(x, y >> 1);
ret = (ret * (ll)ret) % Mod;
if (y & 1)
ret = (ret * (ll)x) % Mod;
return ret;
}
int bdiv(int x, int y){
return (x * (ll)bpow(y, Mod - 2)) % Mod;
}
void setmin(int &x, int y){
x = min(x, y);
}
void setmax(int &x, int y){
x = max(x, y);
}
void setmin(ll &x, ll y){
x = min(x, y);
}
void setmax(ll &x, ll y){
x = max(x, y);
}
int gcd(int a, int b){
return a ? gcd(b % a, a) : b;
}
const ll llinf = 2e18 + 100;
const double eps = 1e-9;
const int maxn = 1e5 + 100, maxw = 1e6 + 100, inf = 2e9 + 100, sq = 300, mod = 1e9 + 7, LG = 17;
int n, k, T;
int a[maxn];
bool check(int s){
int l = k, r = k;
ll sum = 0;
for (int i = 1; i < n; i++){
sum = min(llinf, sum + 2 * T * (ll)s);
int A = (l ? a[l] - a[l - 1] : inf), B = (r < n - 1 ? a[r + 1] - a[r] : inf);
if (min(A, B) > sum)
return 0;
if (A < B)
sum -= a[l] - a[l - 1], l--;
else
sum -= a[r + 1] - a[r], r++;
}
return 1;
}
int main()
{
#ifdef ONPC
//ifstream cin("a.in");
//ofstream cout("a.out");
freopen("a.in", "r", stdin);
freopen("a.out", "w", stdout);
#else
//ifstream cin("sprinklers.in");
//ofstream cout("sprinklers.out");
//freopen("road.in", "r", stdin);
//freopen("road.out", "w", stdout);
#endif // ONPC
ios::sync_with_stdio(0);
cin.tie(0);
cout.tie(0);
cin >> n >> k >> T;
for (int i = 0; i < n; i++)
cin >> a[i];
k--;
int l = -1, r = 1e9;
while (r - l > 1){
int m = (l + r) / 2;
if (check(m))
r = m;
else
l = m;
}
cout << r;
}
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
1 ms |
248 KB |
Output is correct |
| 2 |
Correct |
2 ms |
352 KB |
Output is correct |
| 3 |
Correct |
1 ms |
424 KB |
Output is correct |
| 4 |
Correct |
1 ms |
496 KB |
Output is correct |
| 5 |
Correct |
2 ms |
568 KB |
Output is correct |
| 6 |
Correct |
1 ms |
584 KB |
Output is correct |
| 7 |
Incorrect |
2 ms |
620 KB |
Output isn't correct |
| 8 |
Halted |
0 ms |
0 KB |
- |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
1 ms |
248 KB |
Output is correct |
| 2 |
Correct |
2 ms |
352 KB |
Output is correct |
| 3 |
Correct |
1 ms |
424 KB |
Output is correct |
| 4 |
Correct |
1 ms |
496 KB |
Output is correct |
| 5 |
Correct |
2 ms |
568 KB |
Output is correct |
| 6 |
Correct |
1 ms |
584 KB |
Output is correct |
| 7 |
Incorrect |
2 ms |
620 KB |
Output isn't correct |
| 8 |
Halted |
0 ms |
0 KB |
- |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
1 ms |
248 KB |
Output is correct |
| 2 |
Correct |
2 ms |
352 KB |
Output is correct |
| 3 |
Correct |
1 ms |
424 KB |
Output is correct |
| 4 |
Correct |
1 ms |
496 KB |
Output is correct |
| 5 |
Correct |
2 ms |
568 KB |
Output is correct |
| 6 |
Correct |
1 ms |
584 KB |
Output is correct |
| 7 |
Incorrect |
2 ms |
620 KB |
Output isn't correct |
| 8 |
Halted |
0 ms |
0 KB |
- |
