#include "bits/stdc++.h"
#define int long long
#define dq deque<int>
using namespace std;
const int N = 1.2e5;
int n, k, t, x[N];
dq L, R;
void ps(dq &v) {
v.push_front(0);
for (int i = 1; i < v.size(); i++) v[i] += v[i - 1];
}
array<int, 3> find(const dq &v) {
int mn = v[0];
for (int i = 1; i < v.size(); i++) {
mn = min(mn, v[i]);
if (v[i] >= v[0]) return {v[i], mn, 1};
}
return {0, 0, 0};
}
bool solve(array<dq, 2> v) {
if (v[0][0] + v[1][0] < 0 || v[1].back() + v[0].back() < 0) return false;
array<int, 3> A[2];
A[0] = find(v[0]);
A[1] = find(v[1]);
while (v[0].size() > 1 || v[1].size() > 1) {
bool flag = false;
for (int k = 0; k < 2; k++) if (A[k][2]) {
if (v[k ^ 1][0] + A[k][1] >= 0) {
v[k].pop_front();
while (v[k][0] != A[k][0]) v[k].pop_front();
A[k] = find(v[k]);
flag = true;
}
}
if (flag) continue;
else if (A[0][2] && A[1][2]) return false;
if (!A[0][2] && !A[1][2]) {
for (int k = 0; k < 2; k++) reverse(v[k].begin(), v[k].end());
A[0] = find(v[0]), A[1] = find(v[1]);
continue;
}
return false;
}
return true;
}
bool check(int O) {
int s = O * 2 * t;
dq l = L, r = R;
for (auto &u: l) u = s - u;
for (auto &u: r) u = s - u;
ps(l), ps(r);
return solve(array<dq, 2>{l, r});
}
signed main() {
ios::sync_with_stdio(0), cin.tie(0);
cin >> n >> k >> t, k--;
for (int i = 0; i < n; i++) cin >> x[i];
for (int i = k; i; i--) L.push_back(x[i] - x[i - 1]);
for (int i = k + 1; i < n; i++) R.push_back(x[i] - x[i - 1]);
int l = 0;
for (int i = 35; i >= 0; i--) if (!check(1ll << i | l)) l |= 1 << i;
cout << (check(0) ? 0 : l + 1);
}
Compilation message
sparklers.cpp: In function 'void ps(std::deque<long long int>&)':
sparklers.cpp:10:20: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::deque<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
10 | for (int i = 1; i < v.size(); i++) v[i] += v[i - 1];
| ~~^~~~~~~~~~
sparklers.cpp: In function 'std::array<long long int, 3> find(const std::deque<long long int>&)':
sparklers.cpp:14:20: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::deque<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
14 | for (int i = 1; i < v.size(); i++) {
| ~~^~~~~~~~~~
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
0 ms |
340 KB |
Output is correct |
| 2 |
Correct |
0 ms |
212 KB |
Output is correct |
| 3 |
Correct |
1 ms |
212 KB |
Output is correct |
| 4 |
Correct |
1 ms |
212 KB |
Output is correct |
| 5 |
Correct |
0 ms |
212 KB |
Output is correct |
| 6 |
Correct |
0 ms |
212 KB |
Output is correct |
| 7 |
Correct |
0 ms |
212 KB |
Output is correct |
| 8 |
Correct |
0 ms |
212 KB |
Output is correct |
| 9 |
Correct |
0 ms |
340 KB |
Output is correct |
| 10 |
Correct |
0 ms |
212 KB |
Output is correct |
| 11 |
Correct |
0 ms |
212 KB |
Output is correct |
| 12 |
Correct |
0 ms |
212 KB |
Output is correct |
| 13 |
Correct |
0 ms |
212 KB |
Output is correct |
| 14 |
Correct |
0 ms |
340 KB |
Output is correct |
| 15 |
Correct |
0 ms |
212 KB |
Output is correct |
| 16 |
Correct |
0 ms |
212 KB |
Output is correct |
| 17 |
Correct |
1 ms |
212 KB |
Output is correct |
| 18 |
Correct |
0 ms |
212 KB |
Output is correct |
| 19 |
Correct |
0 ms |
212 KB |
Output is correct |
| 20 |
Correct |
0 ms |
212 KB |
Output is correct |
| 21 |
Correct |
0 ms |
340 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
0 ms |
340 KB |
Output is correct |
| 2 |
Correct |
0 ms |
212 KB |
Output is correct |
| 3 |
Correct |
1 ms |
212 KB |
Output is correct |
| 4 |
Correct |
1 ms |
212 KB |
Output is correct |
| 5 |
Correct |
0 ms |
212 KB |
Output is correct |
| 6 |
Correct |
0 ms |
212 KB |
Output is correct |
| 7 |
Correct |
0 ms |
212 KB |
Output is correct |
| 8 |
Correct |
0 ms |
212 KB |
Output is correct |
| 9 |
Correct |
0 ms |
340 KB |
Output is correct |
| 10 |
Correct |
0 ms |
212 KB |
Output is correct |
| 11 |
Correct |
0 ms |
212 KB |
Output is correct |
| 12 |
Correct |
0 ms |
212 KB |
Output is correct |
| 13 |
Correct |
0 ms |
212 KB |
Output is correct |
| 14 |
Correct |
0 ms |
340 KB |
Output is correct |
| 15 |
Correct |
0 ms |
212 KB |
Output is correct |
| 16 |
Correct |
0 ms |
212 KB |
Output is correct |
| 17 |
Correct |
1 ms |
212 KB |
Output is correct |
| 18 |
Correct |
0 ms |
212 KB |
Output is correct |
| 19 |
Correct |
0 ms |
212 KB |
Output is correct |
| 20 |
Correct |
0 ms |
212 KB |
Output is correct |
| 21 |
Correct |
0 ms |
340 KB |
Output is correct |
| 22 |
Correct |
1 ms |
340 KB |
Output is correct |
| 23 |
Correct |
1 ms |
340 KB |
Output is correct |
| 24 |
Correct |
1 ms |
340 KB |
Output is correct |
| 25 |
Correct |
1 ms |
340 KB |
Output is correct |
| 26 |
Correct |
1 ms |
340 KB |
Output is correct |
| 27 |
Correct |
1 ms |
340 KB |
Output is correct |
| 28 |
Correct |
1 ms |
340 KB |
Output is correct |
| 29 |
Correct |
2 ms |
340 KB |
Output is correct |
| 30 |
Correct |
1 ms |
340 KB |
Output is correct |
| 31 |
Correct |
1 ms |
340 KB |
Output is correct |
| 32 |
Correct |
1 ms |
340 KB |
Output is correct |
| 33 |
Correct |
1 ms |
340 KB |
Output is correct |
| 34 |
Correct |
1 ms |
340 KB |
Output is correct |
| 35 |
Correct |
1 ms |
340 KB |
Output is correct |
| 36 |
Correct |
1 ms |
340 KB |
Output is correct |
| 37 |
Correct |
1 ms |
376 KB |
Output is correct |
| 38 |
Correct |
1 ms |
340 KB |
Output is correct |
| 39 |
Correct |
1 ms |
340 KB |
Output is correct |
| 40 |
Correct |
1 ms |
340 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
0 ms |
340 KB |
Output is correct |
| 2 |
Correct |
0 ms |
212 KB |
Output is correct |
| 3 |
Correct |
1 ms |
212 KB |
Output is correct |
| 4 |
Correct |
1 ms |
212 KB |
Output is correct |
| 5 |
Correct |
0 ms |
212 KB |
Output is correct |
| 6 |
Correct |
0 ms |
212 KB |
Output is correct |
| 7 |
Correct |
0 ms |
212 KB |
Output is correct |
| 8 |
Correct |
0 ms |
212 KB |
Output is correct |
| 9 |
Correct |
0 ms |
340 KB |
Output is correct |
| 10 |
Correct |
0 ms |
212 KB |
Output is correct |
| 11 |
Correct |
0 ms |
212 KB |
Output is correct |
| 12 |
Correct |
0 ms |
212 KB |
Output is correct |
| 13 |
Correct |
0 ms |
212 KB |
Output is correct |
| 14 |
Correct |
0 ms |
340 KB |
Output is correct |
| 15 |
Correct |
0 ms |
212 KB |
Output is correct |
| 16 |
Correct |
0 ms |
212 KB |
Output is correct |
| 17 |
Correct |
1 ms |
212 KB |
Output is correct |
| 18 |
Correct |
0 ms |
212 KB |
Output is correct |
| 19 |
Correct |
0 ms |
212 KB |
Output is correct |
| 20 |
Correct |
0 ms |
212 KB |
Output is correct |
| 21 |
Correct |
0 ms |
340 KB |
Output is correct |
| 22 |
Correct |
1 ms |
340 KB |
Output is correct |
| 23 |
Correct |
1 ms |
340 KB |
Output is correct |
| 24 |
Correct |
1 ms |
340 KB |
Output is correct |
| 25 |
Correct |
1 ms |
340 KB |
Output is correct |
| 26 |
Correct |
1 ms |
340 KB |
Output is correct |
| 27 |
Correct |
1 ms |
340 KB |
Output is correct |
| 28 |
Correct |
1 ms |
340 KB |
Output is correct |
| 29 |
Correct |
2 ms |
340 KB |
Output is correct |
| 30 |
Correct |
1 ms |
340 KB |
Output is correct |
| 31 |
Correct |
1 ms |
340 KB |
Output is correct |
| 32 |
Correct |
1 ms |
340 KB |
Output is correct |
| 33 |
Correct |
1 ms |
340 KB |
Output is correct |
| 34 |
Correct |
1 ms |
340 KB |
Output is correct |
| 35 |
Correct |
1 ms |
340 KB |
Output is correct |
| 36 |
Correct |
1 ms |
340 KB |
Output is correct |
| 37 |
Correct |
1 ms |
376 KB |
Output is correct |
| 38 |
Correct |
1 ms |
340 KB |
Output is correct |
| 39 |
Correct |
1 ms |
340 KB |
Output is correct |
| 40 |
Correct |
1 ms |
340 KB |
Output is correct |
| 41 |
Correct |
52 ms |
2456 KB |
Output is correct |
| 42 |
Correct |
2 ms |
340 KB |
Output is correct |
| 43 |
Correct |
14 ms |
936 KB |
Output is correct |
| 44 |
Correct |
77 ms |
3612 KB |
Output is correct |
| 45 |
Correct |
68 ms |
3588 KB |
Output is correct |
| 46 |
Correct |
78 ms |
3612 KB |
Output is correct |
| 47 |
Correct |
72 ms |
3648 KB |
Output is correct |
| 48 |
Correct |
71 ms |
3596 KB |
Output is correct |
| 49 |
Correct |
79 ms |
3564 KB |
Output is correct |
| 50 |
Correct |
71 ms |
3564 KB |
Output is correct |
| 51 |
Correct |
74 ms |
3652 KB |
Output is correct |
| 52 |
Correct |
68 ms |
3572 KB |
Output is correct |
| 53 |
Correct |
78 ms |
3636 KB |
Output is correct |
| 54 |
Correct |
73 ms |
3584 KB |
Output is correct |
| 55 |
Correct |
72 ms |
3588 KB |
Output is correct |
| 56 |
Correct |
78 ms |
3584 KB |
Output is correct |
| 57 |
Correct |
77 ms |
3592 KB |
Output is correct |
| 58 |
Correct |
79 ms |
3624 KB |
Output is correct |
| 59 |
Correct |
79 ms |
3676 KB |
Output is correct |
| 60 |
Correct |
71 ms |
3584 KB |
Output is correct |
| 61 |
Correct |
73 ms |
3588 KB |
Output is correct |
| 62 |
Correct |
74 ms |
3580 KB |
Output is correct |
| 63 |
Correct |
68 ms |
3588 KB |
Output is correct |
| 64 |
Correct |
75 ms |
3624 KB |
Output is correct |
| 65 |
Correct |
73 ms |
3580 KB |
Output is correct |
| 66 |
Correct |
68 ms |
3564 KB |
Output is correct |
| 67 |
Correct |
73 ms |
3676 KB |
Output is correct |
| 68 |
Correct |
71 ms |
3580 KB |
Output is correct |
| 69 |
Correct |
70 ms |
3576 KB |
Output is correct |
