#include <bits/stdc++.h>
using namespace std;
typedef long long LL;
LL ok(vector<LL> a, vector<LL> b){
LL dp[a.size()][b.size()];
for(int i = 0; i < a.size(); i++){
for(int j = 0; j < b.size(); j++){
dp[i][j] = 0;
if(a[i] >= b[j]){
if((i == 0 && j == 0) || (i > 0 && dp[i-1][j]) || (j > 0 && dp[i][j-1])){
dp[i][j] = 1;
}
}
}
}
return dp[a.size()-1][b.size()-1];
}
LL reach(vector<LL> a, vector<LL> b){
if(a[0] < b[0]) return 0;
vector<pair<LL,LL> > acompress, bcompress;
LL acur = a[0];
LL curmin = a[0];
for(LL i = 0; i < a.size(); i++){
curmin = min(curmin, a[i]);
if(a[i] >= acur){
acur = a[i];
acompress.push_back({acur, curmin});
curmin = a[i];
}
}
LL bcur = b[0];
LL curmax = b[0];
for(LL i = 0; i < b.size(); i++){
curmax = max(curmax, b[i]);
if(b[i] <= bcur){
bcur = b[i];
bcompress.push_back({bcur, curmax});
curmax = b[i];
}
}
LL i = 0;
LL j = 0;
while(i + 1 < acompress.size() || j + 1 < bcompress.size()){
if(j + 1 < bcompress.size() && bcompress[j+1].second <= acompress[i].first){
j++;
} else if(i + 1 < acompress.size() && bcompress[j].first <= acompress[i+1].second){
i++;
} else {
return 0;
}
}
return 1;
}
LL okay(vector<LL> a, vector<LL> b){
LL ma = 0;
LL mb = 0;
for(LL j = 0; j < a.size(); j++){
if(a[j] >= a[ma]) ma = j;
}
for(LL j = 0; j < b.size(); j++){
if(b[j] <= b[mb]) mb = j;
}
vector<LL> la, lb;
vector<LL> ra, rb;
for(LL j = 0; j <= ma; j++) la.push_back(a[j]);
for(LL j = a.size()-1; j >= ma; j--) ra.push_back(a[j]);
for(LL j = 0; j <= mb; j++) lb.push_back(b[j]);
for(LL j = b.size()-1; j >= mb; j--) rb.push_back(b[j]);
return reach(la, lb) && reach(ra, rb);
}
int main(){
cin.sync_with_stdio(0); cin.tie(0);
LL n, k, t;
cin >> n >> k >> t;
k--;
vector<LL> x(n);
for(LL i = 0; i < n; i++){
cin >> x[i];
}
LL s = -1;
LL e = 1000000000;
while(s + 1 < e){
LL m = (s + e) / 2;
vector<LL> y = x;
for(LL i = 0; i < n; i++){
y[i] -= m * t * 2 * i;
}
vector<LL> a, b;
for(LL i = k; i >= 0; i--){
a.push_back(y[i]);
}
for(LL i = k; i < n; i++){
b.push_back(y[i]);
}
if(okay(a,b)){
e = m;
} else {
s = m;
}
}
cout << e << '\n';
}
Compilation message
sparklers.cpp: In function 'LL ok(std::vector<long long int>, std::vector<long long int>)':
sparklers.cpp:7:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for(int i = 0; i < a.size(); i++){
~~^~~~~~~~~~
sparklers.cpp:8:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for(int j = 0; j < b.size(); j++){
~~^~~~~~~~~~
sparklers.cpp: In function 'LL reach(std::vector<long long int>, std::vector<long long int>)':
sparklers.cpp:25:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for(LL i = 0; i < a.size(); i++){
~~^~~~~~~~~~
sparklers.cpp:35:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for(LL i = 0; i < b.size(); i++){
~~^~~~~~~~~~
sparklers.cpp:45:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
while(i + 1 < acompress.size() || j + 1 < bcompress.size()){
~~~~~~^~~~~~~~~~~~~~~~~~
sparklers.cpp:45:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
while(i + 1 < acompress.size() || j + 1 < bcompress.size()){
~~~~~~^~~~~~~~~~~~~~~~~~
sparklers.cpp:46:12: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
if(j + 1 < bcompress.size() && bcompress[j+1].second <= acompress[i].first){
~~~~~~^~~~~~~~~~~~~~~~~~
sparklers.cpp:48:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
} else if(i + 1 < acompress.size() && bcompress[j].first <= acompress[i+1].second){
~~~~~~^~~~~~~~~~~~~~~~~~
sparklers.cpp: In function 'LL okay(std::vector<long long int>, std::vector<long long int>)':
sparklers.cpp:60:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for(LL j = 0; j < a.size(); j++){
~~^~~~~~~~~~
sparklers.cpp:63:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for(LL j = 0; j < b.size(); j++){
~~^~~~~~~~~~
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
3 ms |
376 KB |
Output is correct |
| 2 |
Correct |
3 ms |
376 KB |
Output is correct |
| 3 |
Correct |
2 ms |
484 KB |
Output is correct |
| 4 |
Correct |
2 ms |
492 KB |
Output is correct |
| 5 |
Correct |
2 ms |
492 KB |
Output is correct |
| 6 |
Correct |
3 ms |
492 KB |
Output is correct |
| 7 |
Correct |
3 ms |
600 KB |
Output is correct |
| 8 |
Correct |
3 ms |
600 KB |
Output is correct |
| 9 |
Correct |
3 ms |
600 KB |
Output is correct |
| 10 |
Correct |
2 ms |
672 KB |
Output is correct |
| 11 |
Correct |
3 ms |
672 KB |
Output is correct |
| 12 |
Correct |
3 ms |
672 KB |
Output is correct |
| 13 |
Correct |
2 ms |
672 KB |
Output is correct |
| 14 |
Correct |
2 ms |
672 KB |
Output is correct |
| 15 |
Correct |
3 ms |
672 KB |
Output is correct |
| 16 |
Correct |
3 ms |
672 KB |
Output is correct |
| 17 |
Correct |
2 ms |
672 KB |
Output is correct |
| 18 |
Correct |
2 ms |
736 KB |
Output is correct |
| 19 |
Correct |
2 ms |
736 KB |
Output is correct |
| 20 |
Correct |
2 ms |
736 KB |
Output is correct |
| 21 |
Correct |
2 ms |
736 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
3 ms |
376 KB |
Output is correct |
| 2 |
Correct |
3 ms |
376 KB |
Output is correct |
| 3 |
Correct |
2 ms |
484 KB |
Output is correct |
| 4 |
Correct |
2 ms |
492 KB |
Output is correct |
| 5 |
Correct |
2 ms |
492 KB |
Output is correct |
| 6 |
Correct |
3 ms |
492 KB |
Output is correct |
| 7 |
Correct |
3 ms |
600 KB |
Output is correct |
| 8 |
Correct |
3 ms |
600 KB |
Output is correct |
| 9 |
Correct |
3 ms |
600 KB |
Output is correct |
| 10 |
Correct |
2 ms |
672 KB |
Output is correct |
| 11 |
Correct |
3 ms |
672 KB |
Output is correct |
| 12 |
Correct |
3 ms |
672 KB |
Output is correct |
| 13 |
Correct |
2 ms |
672 KB |
Output is correct |
| 14 |
Correct |
2 ms |
672 KB |
Output is correct |
| 15 |
Correct |
3 ms |
672 KB |
Output is correct |
| 16 |
Correct |
3 ms |
672 KB |
Output is correct |
| 17 |
Correct |
2 ms |
672 KB |
Output is correct |
| 18 |
Correct |
2 ms |
736 KB |
Output is correct |
| 19 |
Correct |
2 ms |
736 KB |
Output is correct |
| 20 |
Correct |
2 ms |
736 KB |
Output is correct |
| 21 |
Correct |
2 ms |
736 KB |
Output is correct |
| 22 |
Correct |
3 ms |
736 KB |
Output is correct |
| 23 |
Correct |
3 ms |
736 KB |
Output is correct |
| 24 |
Correct |
3 ms |
736 KB |
Output is correct |
| 25 |
Correct |
3 ms |
736 KB |
Output is correct |
| 26 |
Correct |
3 ms |
736 KB |
Output is correct |
| 27 |
Correct |
3 ms |
736 KB |
Output is correct |
| 28 |
Correct |
3 ms |
736 KB |
Output is correct |
| 29 |
Correct |
3 ms |
736 KB |
Output is correct |
| 30 |
Correct |
3 ms |
736 KB |
Output is correct |
| 31 |
Correct |
4 ms |
736 KB |
Output is correct |
| 32 |
Correct |
3 ms |
736 KB |
Output is correct |
| 33 |
Correct |
3 ms |
736 KB |
Output is correct |
| 34 |
Correct |
3 ms |
736 KB |
Output is correct |
| 35 |
Correct |
3 ms |
736 KB |
Output is correct |
| 36 |
Correct |
3 ms |
736 KB |
Output is correct |
| 37 |
Correct |
3 ms |
736 KB |
Output is correct |
| 38 |
Correct |
3 ms |
736 KB |
Output is correct |
| 39 |
Correct |
3 ms |
736 KB |
Output is correct |
| 40 |
Correct |
3 ms |
736 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
3 ms |
376 KB |
Output is correct |
| 2 |
Correct |
3 ms |
376 KB |
Output is correct |
| 3 |
Correct |
2 ms |
484 KB |
Output is correct |
| 4 |
Correct |
2 ms |
492 KB |
Output is correct |
| 5 |
Correct |
2 ms |
492 KB |
Output is correct |
| 6 |
Correct |
3 ms |
492 KB |
Output is correct |
| 7 |
Correct |
3 ms |
600 KB |
Output is correct |
| 8 |
Correct |
3 ms |
600 KB |
Output is correct |
| 9 |
Correct |
3 ms |
600 KB |
Output is correct |
| 10 |
Correct |
2 ms |
672 KB |
Output is correct |
| 11 |
Correct |
3 ms |
672 KB |
Output is correct |
| 12 |
Correct |
3 ms |
672 KB |
Output is correct |
| 13 |
Correct |
2 ms |
672 KB |
Output is correct |
| 14 |
Correct |
2 ms |
672 KB |
Output is correct |
| 15 |
Correct |
3 ms |
672 KB |
Output is correct |
| 16 |
Correct |
3 ms |
672 KB |
Output is correct |
| 17 |
Correct |
2 ms |
672 KB |
Output is correct |
| 18 |
Correct |
2 ms |
736 KB |
Output is correct |
| 19 |
Correct |
2 ms |
736 KB |
Output is correct |
| 20 |
Correct |
2 ms |
736 KB |
Output is correct |
| 21 |
Correct |
2 ms |
736 KB |
Output is correct |
| 22 |
Correct |
3 ms |
736 KB |
Output is correct |
| 23 |
Correct |
3 ms |
736 KB |
Output is correct |
| 24 |
Correct |
3 ms |
736 KB |
Output is correct |
| 25 |
Correct |
3 ms |
736 KB |
Output is correct |
| 26 |
Correct |
3 ms |
736 KB |
Output is correct |
| 27 |
Correct |
3 ms |
736 KB |
Output is correct |
| 28 |
Correct |
3 ms |
736 KB |
Output is correct |
| 29 |
Correct |
3 ms |
736 KB |
Output is correct |
| 30 |
Correct |
3 ms |
736 KB |
Output is correct |
| 31 |
Correct |
4 ms |
736 KB |
Output is correct |
| 32 |
Correct |
3 ms |
736 KB |
Output is correct |
| 33 |
Correct |
3 ms |
736 KB |
Output is correct |
| 34 |
Correct |
3 ms |
736 KB |
Output is correct |
| 35 |
Correct |
3 ms |
736 KB |
Output is correct |
| 36 |
Correct |
3 ms |
736 KB |
Output is correct |
| 37 |
Correct |
3 ms |
736 KB |
Output is correct |
| 38 |
Correct |
3 ms |
736 KB |
Output is correct |
| 39 |
Correct |
3 ms |
736 KB |
Output is correct |
| 40 |
Correct |
3 ms |
736 KB |
Output is correct |
| 41 |
Correct |
111 ms |
5516 KB |
Output is correct |
| 42 |
Correct |
8 ms |
5516 KB |
Output is correct |
| 43 |
Correct |
32 ms |
5516 KB |
Output is correct |
| 44 |
Correct |
200 ms |
10444 KB |
Output is correct |
| 45 |
Correct |
213 ms |
10444 KB |
Output is correct |
| 46 |
Correct |
163 ms |
12588 KB |
Output is correct |
| 47 |
Correct |
196 ms |
13660 KB |
Output is correct |
| 48 |
Correct |
173 ms |
13660 KB |
Output is correct |
| 49 |
Correct |
145 ms |
15232 KB |
Output is correct |
| 50 |
Correct |
185 ms |
15232 KB |
Output is correct |
| 51 |
Correct |
179 ms |
17472 KB |
Output is correct |
| 52 |
Correct |
211 ms |
18168 KB |
Output is correct |
| 53 |
Correct |
190 ms |
19172 KB |
Output is correct |
| 54 |
Correct |
212 ms |
19856 KB |
Output is correct |
| 55 |
Correct |
201 ms |
20040 KB |
Output is correct |
| 56 |
Correct |
181 ms |
22324 KB |
Output is correct |
| 57 |
Correct |
210 ms |
23192 KB |
Output is correct |
| 58 |
Correct |
231 ms |
23192 KB |
Output is correct |
| 59 |
Correct |
202 ms |
23192 KB |
Output is correct |
| 60 |
Correct |
213 ms |
25208 KB |
Output is correct |
| 61 |
Correct |
222 ms |
25672 KB |
Output is correct |
| 62 |
Correct |
197 ms |
27248 KB |
Output is correct |
| 63 |
Correct |
182 ms |
27572 KB |
Output is correct |
| 64 |
Correct |
155 ms |
27832 KB |
Output is correct |
| 65 |
Correct |
155 ms |
28724 KB |
Output is correct |
| 66 |
Correct |
178 ms |
29724 KB |
Output is correct |
| 67 |
Correct |
156 ms |
30596 KB |
Output is correct |
| 68 |
Correct |
172 ms |
32508 KB |
Output is correct |
| 69 |
Correct |
171 ms |
33620 KB |
Output is correct |
