#include<bits/stdc++.h>
#define pb emplace_back
#define AI(i) begin(i), end(i)
using namespace std;
using ll = long long;
template<class T> bool chmin(T &a, T b) { return b < a && (a = b, true); }
template<class T> bool chmax(T &a, T b) { return a < b && (a = b, true); }
#ifdef KEV
#define DE(args...) kout("[ " + string(#args) + " ] = ", args)
void kout() {cerr << endl;}
template<class T, class ...U> void kout (T v, U ...e) { cerr << v << ' ', kout(e...); }
template<class T> void debug(T L, T R) { while (L != R) cerr << *L << " \n"[next(L)==R], ++L; }
#else
#define DE(...) 0
#define debug(...) 0
#endif
// What I should check
// 1. overflow
// 2. corner cases
// Enjoy the problem instead of hurrying to AC
// Good luck !
const int MAX_N = 1010;
const ll inf = 1ll << 55;
int n, k, T;
int pos[MAX_N];
bool dp[MAX_N][MAX_N];
ll a[MAX_N];
bool valid(ll S) {
memset(dp, 0, sizeof(dp));
dp[k][k] = true;
for (int l = k;l >= 1;--l)
for (int r = k;r <= n;++r) {
auto valid = [&](int l, int r) {
return 2 * S * (r-l) * T >= (pos[r] - pos[l]);
};
if (dp[l][r]) {
if (r < n) {
ll d = pos[r+1] - pos[r];
if (valid(l, r+1))
dp[l][r+1] = true;
}
if (l > 1) {
ll d = pos[l] - pos[l-1];
if (valid(l-1, r))
dp[l-1][r] = true;
}
}
}
return dp[1][n];
}
int32_t main() {
ios_base::sync_with_stdio(0), cin.tie(0);
cin >> n >> k >> T;
for (int i = 1;i <= n;++i)
cin >> pos[i];
//assert(n < MAX_N);
ll L = 0, R = 2 * pos[n], M;
while (L < R) {
M = L + R >> 1;
if (valid(M))
R = M;
else L = M + 1;
}
cout << L << '\n';
}
Compilation message
sparklers.cpp: In function 'bool valid(ll)':
sparklers.cpp:45:9: warning: unused variable 'd' [-Wunused-variable]
45 | ll d = pos[r+1] - pos[r];
| ^
sparklers.cpp:50:9: warning: unused variable 'd' [-Wunused-variable]
50 | ll d = pos[l] - pos[l-1];
| ^
sparklers.cpp: In function 'int32_t main()':
sparklers.cpp:71:9: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
71 | M = L + R >> 1;
| ~~^~~
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
2 ms |
1228 KB |
Output is correct |
2 |
Correct |
2 ms |
1228 KB |
Output is correct |
3 |
Correct |
2 ms |
1228 KB |
Output is correct |
4 |
Correct |
2 ms |
1228 KB |
Output is correct |
5 |
Correct |
2 ms |
1228 KB |
Output is correct |
6 |
Correct |
2 ms |
1228 KB |
Output is correct |
7 |
Correct |
2 ms |
1228 KB |
Output is correct |
8 |
Correct |
2 ms |
1228 KB |
Output is correct |
9 |
Correct |
2 ms |
1228 KB |
Output is correct |
10 |
Correct |
2 ms |
1228 KB |
Output is correct |
11 |
Correct |
2 ms |
1228 KB |
Output is correct |
12 |
Correct |
2 ms |
1228 KB |
Output is correct |
13 |
Correct |
2 ms |
1228 KB |
Output is correct |
14 |
Correct |
2 ms |
1228 KB |
Output is correct |
15 |
Correct |
2 ms |
1228 KB |
Output is correct |
16 |
Correct |
2 ms |
1228 KB |
Output is correct |
17 |
Correct |
2 ms |
1228 KB |
Output is correct |
18 |
Correct |
2 ms |
1228 KB |
Output is correct |
19 |
Correct |
0 ms |
204 KB |
Output is correct |
20 |
Correct |
2 ms |
1228 KB |
Output is correct |
21 |
Correct |
0 ms |
204 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
2 ms |
1228 KB |
Output is correct |
2 |
Correct |
2 ms |
1228 KB |
Output is correct |
3 |
Correct |
2 ms |
1228 KB |
Output is correct |
4 |
Correct |
2 ms |
1228 KB |
Output is correct |
5 |
Correct |
2 ms |
1228 KB |
Output is correct |
6 |
Correct |
2 ms |
1228 KB |
Output is correct |
7 |
Correct |
2 ms |
1228 KB |
Output is correct |
8 |
Correct |
2 ms |
1228 KB |
Output is correct |
9 |
Correct |
2 ms |
1228 KB |
Output is correct |
10 |
Correct |
2 ms |
1228 KB |
Output is correct |
11 |
Correct |
2 ms |
1228 KB |
Output is correct |
12 |
Correct |
2 ms |
1228 KB |
Output is correct |
13 |
Correct |
2 ms |
1228 KB |
Output is correct |
14 |
Correct |
2 ms |
1228 KB |
Output is correct |
15 |
Correct |
2 ms |
1228 KB |
Output is correct |
16 |
Correct |
2 ms |
1228 KB |
Output is correct |
17 |
Correct |
2 ms |
1228 KB |
Output is correct |
18 |
Correct |
2 ms |
1228 KB |
Output is correct |
19 |
Correct |
0 ms |
204 KB |
Output is correct |
20 |
Correct |
2 ms |
1228 KB |
Output is correct |
21 |
Correct |
0 ms |
204 KB |
Output is correct |
22 |
Correct |
13 ms |
1320 KB |
Output is correct |
23 |
Correct |
9 ms |
1324 KB |
Output is correct |
24 |
Correct |
5 ms |
1228 KB |
Output is correct |
25 |
Correct |
3 ms |
1228 KB |
Output is correct |
26 |
Correct |
13 ms |
1320 KB |
Output is correct |
27 |
Correct |
14 ms |
1320 KB |
Output is correct |
28 |
Correct |
28 ms |
1228 KB |
Output is correct |
29 |
Correct |
42 ms |
1228 KB |
Output is correct |
30 |
Correct |
17 ms |
1228 KB |
Output is correct |
31 |
Correct |
17 ms |
1228 KB |
Output is correct |
32 |
Correct |
21 ms |
1320 KB |
Output is correct |
33 |
Correct |
23 ms |
1228 KB |
Output is correct |
34 |
Correct |
12 ms |
1324 KB |
Output is correct |
35 |
Correct |
26 ms |
1316 KB |
Output is correct |
36 |
Correct |
9 ms |
1320 KB |
Output is correct |
37 |
Correct |
10 ms |
1228 KB |
Output is correct |
38 |
Correct |
20 ms |
1228 KB |
Output is correct |
39 |
Correct |
7 ms |
1228 KB |
Output is correct |
40 |
Correct |
1 ms |
204 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
2 ms |
1228 KB |
Output is correct |
2 |
Correct |
2 ms |
1228 KB |
Output is correct |
3 |
Correct |
2 ms |
1228 KB |
Output is correct |
4 |
Correct |
2 ms |
1228 KB |
Output is correct |
5 |
Correct |
2 ms |
1228 KB |
Output is correct |
6 |
Correct |
2 ms |
1228 KB |
Output is correct |
7 |
Correct |
2 ms |
1228 KB |
Output is correct |
8 |
Correct |
2 ms |
1228 KB |
Output is correct |
9 |
Correct |
2 ms |
1228 KB |
Output is correct |
10 |
Correct |
2 ms |
1228 KB |
Output is correct |
11 |
Correct |
2 ms |
1228 KB |
Output is correct |
12 |
Correct |
2 ms |
1228 KB |
Output is correct |
13 |
Correct |
2 ms |
1228 KB |
Output is correct |
14 |
Correct |
2 ms |
1228 KB |
Output is correct |
15 |
Correct |
2 ms |
1228 KB |
Output is correct |
16 |
Correct |
2 ms |
1228 KB |
Output is correct |
17 |
Correct |
2 ms |
1228 KB |
Output is correct |
18 |
Correct |
2 ms |
1228 KB |
Output is correct |
19 |
Correct |
0 ms |
204 KB |
Output is correct |
20 |
Correct |
2 ms |
1228 KB |
Output is correct |
21 |
Correct |
0 ms |
204 KB |
Output is correct |
22 |
Correct |
13 ms |
1320 KB |
Output is correct |
23 |
Correct |
9 ms |
1324 KB |
Output is correct |
24 |
Correct |
5 ms |
1228 KB |
Output is correct |
25 |
Correct |
3 ms |
1228 KB |
Output is correct |
26 |
Correct |
13 ms |
1320 KB |
Output is correct |
27 |
Correct |
14 ms |
1320 KB |
Output is correct |
28 |
Correct |
28 ms |
1228 KB |
Output is correct |
29 |
Correct |
42 ms |
1228 KB |
Output is correct |
30 |
Correct |
17 ms |
1228 KB |
Output is correct |
31 |
Correct |
17 ms |
1228 KB |
Output is correct |
32 |
Correct |
21 ms |
1320 KB |
Output is correct |
33 |
Correct |
23 ms |
1228 KB |
Output is correct |
34 |
Correct |
12 ms |
1324 KB |
Output is correct |
35 |
Correct |
26 ms |
1316 KB |
Output is correct |
36 |
Correct |
9 ms |
1320 KB |
Output is correct |
37 |
Correct |
10 ms |
1228 KB |
Output is correct |
38 |
Correct |
20 ms |
1228 KB |
Output is correct |
39 |
Correct |
7 ms |
1228 KB |
Output is correct |
40 |
Correct |
1 ms |
204 KB |
Output is correct |
41 |
Runtime error |
1 ms |
460 KB |
Execution killed with signal 11 |
42 |
Halted |
0 ms |
0 KB |
- |