#include <bits/stdc++.h>
#define fi first
#define se second
#define pb push_back
#define lb lower_bound
#define MOD 1000000007
#define INF (1ll<<62)
using namespace std;
typedef long long LL;
typedef pair<int,int> pii;
int N, M;
int L[202020], R[202020];
int D[202020], A[202020];
int main(){
scanf("%d %d", &N, &M);
for (int i=1; i<=N; i++) L[i] = R[i] = i;
while (M--){
int u, v;
scanf("%d %d", &u, &v);
if (u > v) swap(u, v);
R[u] = max(R[u], v);
L[v] = min(L[v], u);
}
for (int i=2; i<=N; i++) A[L[i]]++, A[i]--;
int s=0, r=0;
if (R[1] > 1) D[R[1]] = A[1];
for (int i=1; i<=N; i++){
s += A[i], r = max(r, R[i]);
if (i < R[1]) continue;
D[i] = max(D[i], D[i-1]);
D[r] = max(D[r], D[i] + s);
}
printf("%d\n", N-D[N]-1);
return 0;
}
Compilation message
Main.cpp: In function 'int main()':
Main.cpp:17:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
17 | scanf("%d %d", &N, &M);
| ~~~~~^~~~~~~~~~~~~~~~~
Main.cpp:21:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
21 | scanf("%d %d", &u, &v);
| ~~~~~^~~~~~~~~~~~~~~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
1 ms |
208 KB |
Output is correct |
| 2 |
Correct |
1 ms |
204 KB |
Output is correct |
| 3 |
Correct |
1 ms |
204 KB |
Output is correct |
| 4 |
Correct |
1 ms |
204 KB |
Output is correct |
| 5 |
Correct |
1 ms |
204 KB |
Output is correct |
| 6 |
Correct |
1 ms |
204 KB |
Output is correct |
| 7 |
Correct |
1 ms |
204 KB |
Output is correct |
| 8 |
Correct |
1 ms |
204 KB |
Output is correct |
| 9 |
Correct |
1 ms |
204 KB |
Output is correct |
| 10 |
Correct |
1 ms |
204 KB |
Output is correct |
| 11 |
Correct |
1 ms |
204 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
1 ms |
208 KB |
Output is correct |
| 2 |
Correct |
1 ms |
204 KB |
Output is correct |
| 3 |
Correct |
1 ms |
204 KB |
Output is correct |
| 4 |
Correct |
1 ms |
204 KB |
Output is correct |
| 5 |
Correct |
1 ms |
204 KB |
Output is correct |
| 6 |
Correct |
1 ms |
204 KB |
Output is correct |
| 7 |
Correct |
1 ms |
204 KB |
Output is correct |
| 8 |
Correct |
1 ms |
204 KB |
Output is correct |
| 9 |
Correct |
1 ms |
204 KB |
Output is correct |
| 10 |
Correct |
1 ms |
204 KB |
Output is correct |
| 11 |
Correct |
1 ms |
204 KB |
Output is correct |
| 12 |
Correct |
1 ms |
208 KB |
Output is correct |
| 13 |
Correct |
1 ms |
204 KB |
Output is correct |
| 14 |
Correct |
1 ms |
204 KB |
Output is correct |
| 15 |
Correct |
1 ms |
204 KB |
Output is correct |
| 16 |
Correct |
1 ms |
204 KB |
Output is correct |
| 17 |
Correct |
1 ms |
204 KB |
Output is correct |
| 18 |
Correct |
1 ms |
204 KB |
Output is correct |
| 19 |
Correct |
1 ms |
204 KB |
Output is correct |
| 20 |
Correct |
1 ms |
204 KB |
Output is correct |
| 21 |
Correct |
1 ms |
204 KB |
Output is correct |
| 22 |
Correct |
1 ms |
204 KB |
Output is correct |
| 23 |
Correct |
1 ms |
332 KB |
Output is correct |
| 24 |
Correct |
1 ms |
332 KB |
Output is correct |
| 25 |
Correct |
5 ms |
332 KB |
Output is correct |
| 26 |
Correct |
6 ms |
332 KB |
Output is correct |
| 27 |
Correct |
4 ms |
332 KB |
Output is correct |
| 28 |
Correct |
4 ms |
332 KB |
Output is correct |
| 29 |
Correct |
2 ms |
332 KB |
Output is correct |
| 30 |
Correct |
9 ms |
352 KB |
Output is correct |
| 31 |
Correct |
9 ms |
356 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
1 ms |
208 KB |
Output is correct |
| 2 |
Correct |
1 ms |
204 KB |
Output is correct |
| 3 |
Correct |
1 ms |
204 KB |
Output is correct |
| 4 |
Correct |
1 ms |
204 KB |
Output is correct |
| 5 |
Correct |
1 ms |
204 KB |
Output is correct |
| 6 |
Correct |
1 ms |
204 KB |
Output is correct |
| 7 |
Correct |
1 ms |
204 KB |
Output is correct |
| 8 |
Correct |
1 ms |
204 KB |
Output is correct |
| 9 |
Correct |
1 ms |
204 KB |
Output is correct |
| 10 |
Correct |
1 ms |
204 KB |
Output is correct |
| 11 |
Correct |
1 ms |
204 KB |
Output is correct |
| 12 |
Correct |
1 ms |
208 KB |
Output is correct |
| 13 |
Correct |
1 ms |
204 KB |
Output is correct |
| 14 |
Correct |
1 ms |
204 KB |
Output is correct |
| 15 |
Correct |
1 ms |
204 KB |
Output is correct |
| 16 |
Correct |
1 ms |
204 KB |
Output is correct |
| 17 |
Correct |
1 ms |
204 KB |
Output is correct |
| 18 |
Correct |
1 ms |
204 KB |
Output is correct |
| 19 |
Correct |
1 ms |
204 KB |
Output is correct |
| 20 |
Correct |
1 ms |
204 KB |
Output is correct |
| 21 |
Correct |
1 ms |
204 KB |
Output is correct |
| 22 |
Correct |
1 ms |
204 KB |
Output is correct |
| 23 |
Correct |
1 ms |
332 KB |
Output is correct |
| 24 |
Correct |
1 ms |
332 KB |
Output is correct |
| 25 |
Correct |
5 ms |
332 KB |
Output is correct |
| 26 |
Correct |
6 ms |
332 KB |
Output is correct |
| 27 |
Correct |
4 ms |
332 KB |
Output is correct |
| 28 |
Correct |
4 ms |
332 KB |
Output is correct |
| 29 |
Correct |
2 ms |
332 KB |
Output is correct |
| 30 |
Correct |
9 ms |
352 KB |
Output is correct |
| 31 |
Correct |
9 ms |
356 KB |
Output is correct |
| 32 |
Correct |
6 ms |
3404 KB |
Output is correct |
| 33 |
Correct |
6 ms |
3408 KB |
Output is correct |
| 34 |
Correct |
55 ms |
2628 KB |
Output is correct |
| 35 |
Correct |
64 ms |
3400 KB |
Output is correct |
| 36 |
Correct |
64 ms |
3400 KB |
Output is correct |
| 37 |
Correct |
61 ms |
3388 KB |
Output is correct |
| 38 |
Correct |
5 ms |
3404 KB |
Output is correct |
| 39 |
Correct |
7 ms |
3404 KB |
Output is correct |
| 40 |
Correct |
29 ms |
1580 KB |
Output is correct |
| 41 |
Correct |
54 ms |
2504 KB |
Output is correct |
| 42 |
Correct |
61 ms |
3264 KB |
Output is correct |
| 43 |
Correct |
66 ms |
3256 KB |
Output is correct |
| 44 |
Correct |
1 ms |
204 KB |
Output is correct |
| 45 |
Correct |
1 ms |
204 KB |
Output is correct |
