#include <bits/stdc++.h>
#define pb push_back
#define all(v) ((v).begin(), (v).end())
#define sortv(v) sort(all(v))
#define sz(v) ((int)(v).size())
#define uniqv(v) (v).erase(unique(all(v)), (v).end())
#define umax(a, b) (a)=max((a), (b))
#define umin(a, b) (a)=min((a), (b))
#define FOR(i,a,b) for(int i = (a); i <= (b); i++)
#define rep(i,n) FOR(i,1,n)
#define rep0(i,n) FOR(i,0,(int)(n)-1)
#define FI first
#define SE second
#define INF 2000000000
#define INFLL 1000000000000000000LL
const int MAX_N = 100000;
using namespace std;
typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
int N, K;
ll T;
vector<ll> v;
ll D[MAX_N+1];
bool chk(ll x){
for(int i=0; i<N; i++) D[i] = (ll)2 * T * (ll)i * x - v[i];
int pl=K, pr=K, nl=K-1, nr=K+1;
while(1){
while(D[nl]>D[pl] && D[nl]<=D[pr] && nl>0) nl--;
while(D[nr]<D[pr] && D[nr]>=D[pl] && nr<N-1) nr++;
bool ch = false;
if(nl>=0 && D[nl]<=D[pl]){
pl = nl; nl--;
ch = true;
}
if(nr<N && D[nr]>=D[pr]){
pr = nr; nr++;
ch = true;
}
if(!ch) break;
}
if((nr<N && D[pl]>D[nr]) || (nl>=0 && D[pr]<D[nl])) return false;
int l = 0, r = N-1; nl = 1; nr = N-2;
while(1){
while(D[l]<D[nl] && D[nl]<=D[r] && nl<K) nl++;
while(D[l]<=D[nr] && D[nr]<D[r] && K<nr) nr--;
bool ch = false;
if(nl<=K && D[nl]<=D[l]){
l = nl; nl++;
ch = true;
}
if(nr>=K && D[nr]>=D[r]){
r = nr; nr--;
ch = true;
}
if(!ch) break;
}
return ((pl<=l) && (r<=pr));
}
int main(){
scanf("%d%d%lld", &N, &K, &T);
K--;
for(int i=0; i<N; i++){
ll x; scanf("%lld", &x);
v.pb(x);
}
ll s = 0, e = INF, m;
while(s<e){
m = (s+e)/2;
if(chk(m)){
e = m;
}else{
s = m+1;
}
}
printf("%lld", s);
return 0;
}
Compilation message
sparklers.cpp: In function 'int main()':
sparklers.cpp:68:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
scanf("%d%d%lld", &N, &K, &T);
~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
sparklers.cpp:71:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
ll x; scanf("%lld", &x);
~~~~~^~~~~~~~~~~~
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
2 ms |
256 KB |
Output is correct |
| 2 |
Correct |
2 ms |
376 KB |
Output is correct |
| 3 |
Correct |
2 ms |
256 KB |
Output is correct |
| 4 |
Correct |
2 ms |
256 KB |
Output is correct |
| 5 |
Correct |
2 ms |
252 KB |
Output is correct |
| 6 |
Correct |
2 ms |
380 KB |
Output is correct |
| 7 |
Correct |
3 ms |
376 KB |
Output is correct |
| 8 |
Correct |
2 ms |
256 KB |
Output is correct |
| 9 |
Correct |
2 ms |
256 KB |
Output is correct |
| 10 |
Correct |
2 ms |
376 KB |
Output is correct |
| 11 |
Correct |
2 ms |
376 KB |
Output is correct |
| 12 |
Correct |
2 ms |
256 KB |
Output is correct |
| 13 |
Correct |
2 ms |
256 KB |
Output is correct |
| 14 |
Correct |
2 ms |
376 KB |
Output is correct |
| 15 |
Correct |
2 ms |
376 KB |
Output is correct |
| 16 |
Correct |
2 ms |
348 KB |
Output is correct |
| 17 |
Correct |
2 ms |
256 KB |
Output is correct |
| 18 |
Correct |
2 ms |
376 KB |
Output is correct |
| 19 |
Correct |
2 ms |
256 KB |
Output is correct |
| 20 |
Correct |
2 ms |
348 KB |
Output is correct |
| 21 |
Correct |
2 ms |
256 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
2 ms |
256 KB |
Output is correct |
| 2 |
Correct |
2 ms |
376 KB |
Output is correct |
| 3 |
Correct |
2 ms |
256 KB |
Output is correct |
| 4 |
Correct |
2 ms |
256 KB |
Output is correct |
| 5 |
Correct |
2 ms |
252 KB |
Output is correct |
| 6 |
Correct |
2 ms |
380 KB |
Output is correct |
| 7 |
Correct |
3 ms |
376 KB |
Output is correct |
| 8 |
Correct |
2 ms |
256 KB |
Output is correct |
| 9 |
Correct |
2 ms |
256 KB |
Output is correct |
| 10 |
Correct |
2 ms |
376 KB |
Output is correct |
| 11 |
Correct |
2 ms |
376 KB |
Output is correct |
| 12 |
Correct |
2 ms |
256 KB |
Output is correct |
| 13 |
Correct |
2 ms |
256 KB |
Output is correct |
| 14 |
Correct |
2 ms |
376 KB |
Output is correct |
| 15 |
Correct |
2 ms |
376 KB |
Output is correct |
| 16 |
Correct |
2 ms |
348 KB |
Output is correct |
| 17 |
Correct |
2 ms |
256 KB |
Output is correct |
| 18 |
Correct |
2 ms |
376 KB |
Output is correct |
| 19 |
Correct |
2 ms |
256 KB |
Output is correct |
| 20 |
Correct |
2 ms |
348 KB |
Output is correct |
| 21 |
Correct |
2 ms |
256 KB |
Output is correct |
| 22 |
Correct |
2 ms |
376 KB |
Output is correct |
| 23 |
Correct |
2 ms |
376 KB |
Output is correct |
| 24 |
Correct |
2 ms |
376 KB |
Output is correct |
| 25 |
Correct |
2 ms |
376 KB |
Output is correct |
| 26 |
Correct |
2 ms |
376 KB |
Output is correct |
| 27 |
Correct |
2 ms |
376 KB |
Output is correct |
| 28 |
Correct |
2 ms |
376 KB |
Output is correct |
| 29 |
Correct |
3 ms |
376 KB |
Output is correct |
| 30 |
Correct |
3 ms |
376 KB |
Output is correct |
| 31 |
Correct |
3 ms |
376 KB |
Output is correct |
| 32 |
Correct |
2 ms |
376 KB |
Output is correct |
| 33 |
Correct |
2 ms |
376 KB |
Output is correct |
| 34 |
Correct |
2 ms |
376 KB |
Output is correct |
| 35 |
Correct |
2 ms |
376 KB |
Output is correct |
| 36 |
Correct |
2 ms |
376 KB |
Output is correct |
| 37 |
Correct |
2 ms |
376 KB |
Output is correct |
| 38 |
Correct |
2 ms |
376 KB |
Output is correct |
| 39 |
Correct |
2 ms |
376 KB |
Output is correct |
| 40 |
Correct |
2 ms |
376 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
2 ms |
256 KB |
Output is correct |
| 2 |
Correct |
2 ms |
376 KB |
Output is correct |
| 3 |
Correct |
2 ms |
256 KB |
Output is correct |
| 4 |
Correct |
2 ms |
256 KB |
Output is correct |
| 5 |
Correct |
2 ms |
252 KB |
Output is correct |
| 6 |
Correct |
2 ms |
380 KB |
Output is correct |
| 7 |
Correct |
3 ms |
376 KB |
Output is correct |
| 8 |
Correct |
2 ms |
256 KB |
Output is correct |
| 9 |
Correct |
2 ms |
256 KB |
Output is correct |
| 10 |
Correct |
2 ms |
376 KB |
Output is correct |
| 11 |
Correct |
2 ms |
376 KB |
Output is correct |
| 12 |
Correct |
2 ms |
256 KB |
Output is correct |
| 13 |
Correct |
2 ms |
256 KB |
Output is correct |
| 14 |
Correct |
2 ms |
376 KB |
Output is correct |
| 15 |
Correct |
2 ms |
376 KB |
Output is correct |
| 16 |
Correct |
2 ms |
348 KB |
Output is correct |
| 17 |
Correct |
2 ms |
256 KB |
Output is correct |
| 18 |
Correct |
2 ms |
376 KB |
Output is correct |
| 19 |
Correct |
2 ms |
256 KB |
Output is correct |
| 20 |
Correct |
2 ms |
348 KB |
Output is correct |
| 21 |
Correct |
2 ms |
256 KB |
Output is correct |
| 22 |
Correct |
2 ms |
376 KB |
Output is correct |
| 23 |
Correct |
2 ms |
376 KB |
Output is correct |
| 24 |
Correct |
2 ms |
376 KB |
Output is correct |
| 25 |
Correct |
2 ms |
376 KB |
Output is correct |
| 26 |
Correct |
2 ms |
376 KB |
Output is correct |
| 27 |
Correct |
2 ms |
376 KB |
Output is correct |
| 28 |
Correct |
2 ms |
376 KB |
Output is correct |
| 29 |
Correct |
3 ms |
376 KB |
Output is correct |
| 30 |
Correct |
3 ms |
376 KB |
Output is correct |
| 31 |
Correct |
3 ms |
376 KB |
Output is correct |
| 32 |
Correct |
2 ms |
376 KB |
Output is correct |
| 33 |
Correct |
2 ms |
376 KB |
Output is correct |
| 34 |
Correct |
2 ms |
376 KB |
Output is correct |
| 35 |
Correct |
2 ms |
376 KB |
Output is correct |
| 36 |
Correct |
2 ms |
376 KB |
Output is correct |
| 37 |
Correct |
2 ms |
376 KB |
Output is correct |
| 38 |
Correct |
2 ms |
376 KB |
Output is correct |
| 39 |
Correct |
2 ms |
376 KB |
Output is correct |
| 40 |
Correct |
2 ms |
376 KB |
Output is correct |
| 41 |
Correct |
20 ms |
2292 KB |
Output is correct |
| 42 |
Correct |
3 ms |
504 KB |
Output is correct |
| 43 |
Correct |
8 ms |
888 KB |
Output is correct |
| 44 |
Correct |
31 ms |
3048 KB |
Output is correct |
| 45 |
Correct |
28 ms |
2920 KB |
Output is correct |
| 46 |
Correct |
31 ms |
2920 KB |
Output is correct |
| 47 |
Correct |
32 ms |
2924 KB |
Output is correct |
| 48 |
Correct |
30 ms |
2924 KB |
Output is correct |
| 49 |
Correct |
31 ms |
2928 KB |
Output is correct |
| 50 |
Correct |
29 ms |
2920 KB |
Output is correct |
| 51 |
Correct |
31 ms |
2924 KB |
Output is correct |
| 52 |
Correct |
29 ms |
2924 KB |
Output is correct |
| 53 |
Correct |
32 ms |
2924 KB |
Output is correct |
| 54 |
Correct |
30 ms |
2924 KB |
Output is correct |
| 55 |
Correct |
29 ms |
2924 KB |
Output is correct |
| 56 |
Correct |
30 ms |
2924 KB |
Output is correct |
| 57 |
Correct |
30 ms |
2924 KB |
Output is correct |
| 58 |
Correct |
30 ms |
2920 KB |
Output is correct |
| 59 |
Correct |
23 ms |
2152 KB |
Output is correct |
| 60 |
Correct |
28 ms |
2920 KB |
Output is correct |
| 61 |
Correct |
28 ms |
2924 KB |
Output is correct |
| 62 |
Correct |
28 ms |
2924 KB |
Output is correct |
| 63 |
Correct |
41 ms |
3052 KB |
Output is correct |
| 64 |
Correct |
29 ms |
3052 KB |
Output is correct |
| 65 |
Correct |
27 ms |
2920 KB |
Output is correct |
| 66 |
Correct |
27 ms |
2920 KB |
Output is correct |
| 67 |
Correct |
27 ms |
2928 KB |
Output is correct |
| 68 |
Correct |
29 ms |
3048 KB |
Output is correct |
| 69 |
Correct |
27 ms |
2924 KB |
Output is correct |
