#include <bits/stdc++.h>
#define upmin(a,b) (a)=(min((a),(b)))
#define INF (0x3f3f3f3f)
using namespace std;
const int MAXN = 5'005;
int D[MAXN], L[MAXN], B[MAXN];
int A[MAXN];
int N;
int main() {
ios_base::sync_with_stdio(0); cin.tie(0);
{
int M;
cin >> N >> M;
fill_n(A, N+2, INF);
while(M--) {
int a, b; cin >> a >> b;
if(a > b) swap(a, b);
upmin(A[b], a);
}
}
L[N+1] = N;
for(int i = N; i; i--) L[i] = min({L[i+1], A[i], i-1});
for(int i = N; i; i--) if(A[i] < i) { B[A[i]+1]++; B[i+1]--; }
for(int i = 1; i <= N; i++) B[i+1] += B[i];
for(int i = N; i; i--) {
int r = 0;
for(int j = N+1; i < j; j--) if(i <= L[j]) {
if(1 == i && 2 != j) continue;
int t = D[j] + B[j];
if(r < t) r = t;
}
D[i] = r;
}
cout << N-1 - D[1] << '\n';
return 0;
}
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
0 ms |
340 KB |
Output is correct |
| 2 |
Correct |
0 ms |
340 KB |
Output is correct |
| 3 |
Correct |
1 ms |
340 KB |
Output is correct |
| 4 |
Correct |
1 ms |
340 KB |
Output is correct |
| 5 |
Correct |
1 ms |
340 KB |
Output is correct |
| 6 |
Correct |
1 ms |
340 KB |
Output is correct |
| 7 |
Correct |
1 ms |
340 KB |
Output is correct |
| 8 |
Correct |
1 ms |
340 KB |
Output is correct |
| 9 |
Correct |
1 ms |
340 KB |
Output is correct |
| 10 |
Correct |
1 ms |
340 KB |
Output is correct |
| 11 |
Correct |
1 ms |
340 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
0 ms |
340 KB |
Output is correct |
| 2 |
Correct |
0 ms |
340 KB |
Output is correct |
| 3 |
Correct |
1 ms |
340 KB |
Output is correct |
| 4 |
Correct |
1 ms |
340 KB |
Output is correct |
| 5 |
Correct |
1 ms |
340 KB |
Output is correct |
| 6 |
Correct |
1 ms |
340 KB |
Output is correct |
| 7 |
Correct |
1 ms |
340 KB |
Output is correct |
| 8 |
Correct |
1 ms |
340 KB |
Output is correct |
| 9 |
Correct |
1 ms |
340 KB |
Output is correct |
| 10 |
Correct |
1 ms |
340 KB |
Output is correct |
| 11 |
Correct |
1 ms |
340 KB |
Output is correct |
| 12 |
Correct |
0 ms |
340 KB |
Output is correct |
| 13 |
Correct |
0 ms |
340 KB |
Output is correct |
| 14 |
Correct |
1 ms |
340 KB |
Output is correct |
| 15 |
Correct |
1 ms |
340 KB |
Output is correct |
| 16 |
Correct |
1 ms |
340 KB |
Output is correct |
| 17 |
Correct |
1 ms |
340 KB |
Output is correct |
| 18 |
Correct |
1 ms |
340 KB |
Output is correct |
| 19 |
Correct |
1 ms |
340 KB |
Output is correct |
| 20 |
Correct |
1 ms |
340 KB |
Output is correct |
| 21 |
Correct |
1 ms |
340 KB |
Output is correct |
| 22 |
Correct |
1 ms |
340 KB |
Output is correct |
| 23 |
Correct |
28 ms |
340 KB |
Output is correct |
| 24 |
Correct |
26 ms |
340 KB |
Output is correct |
| 25 |
Correct |
17 ms |
544 KB |
Output is correct |
| 26 |
Correct |
15 ms |
468 KB |
Output is correct |
| 27 |
Correct |
20 ms |
460 KB |
Output is correct |
| 28 |
Correct |
15 ms |
492 KB |
Output is correct |
| 29 |
Correct |
15 ms |
336 KB |
Output is correct |
| 30 |
Correct |
24 ms |
716 KB |
Output is correct |
| 31 |
Correct |
15 ms |
696 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
0 ms |
340 KB |
Output is correct |
| 2 |
Correct |
0 ms |
340 KB |
Output is correct |
| 3 |
Correct |
1 ms |
340 KB |
Output is correct |
| 4 |
Correct |
1 ms |
340 KB |
Output is correct |
| 5 |
Correct |
1 ms |
340 KB |
Output is correct |
| 6 |
Correct |
1 ms |
340 KB |
Output is correct |
| 7 |
Correct |
1 ms |
340 KB |
Output is correct |
| 8 |
Correct |
1 ms |
340 KB |
Output is correct |
| 9 |
Correct |
1 ms |
340 KB |
Output is correct |
| 10 |
Correct |
1 ms |
340 KB |
Output is correct |
| 11 |
Correct |
1 ms |
340 KB |
Output is correct |
| 12 |
Correct |
0 ms |
340 KB |
Output is correct |
| 13 |
Correct |
0 ms |
340 KB |
Output is correct |
| 14 |
Correct |
1 ms |
340 KB |
Output is correct |
| 15 |
Correct |
1 ms |
340 KB |
Output is correct |
| 16 |
Correct |
1 ms |
340 KB |
Output is correct |
| 17 |
Correct |
1 ms |
340 KB |
Output is correct |
| 18 |
Correct |
1 ms |
340 KB |
Output is correct |
| 19 |
Correct |
1 ms |
340 KB |
Output is correct |
| 20 |
Correct |
1 ms |
340 KB |
Output is correct |
| 21 |
Correct |
1 ms |
340 KB |
Output is correct |
| 22 |
Correct |
1 ms |
340 KB |
Output is correct |
| 23 |
Correct |
28 ms |
340 KB |
Output is correct |
| 24 |
Correct |
26 ms |
340 KB |
Output is correct |
| 25 |
Correct |
17 ms |
544 KB |
Output is correct |
| 26 |
Correct |
15 ms |
468 KB |
Output is correct |
| 27 |
Correct |
20 ms |
460 KB |
Output is correct |
| 28 |
Correct |
15 ms |
492 KB |
Output is correct |
| 29 |
Correct |
15 ms |
336 KB |
Output is correct |
| 30 |
Correct |
24 ms |
716 KB |
Output is correct |
| 31 |
Correct |
15 ms |
696 KB |
Output is correct |
| 32 |
Runtime error |
1 ms |
456 KB |
Execution killed with signal 11 |
| 33 |
Halted |
0 ms |
0 KB |
- |
