#include <bits/stdc++.h>
#define fr(i, n, m) for(int i = (n); i < (m); i ++)
#define pb push_back
#define st first
#define nd second
#define pq priority_queue
#define all(x) begin(x), end(x)
#include <time.h>
#include <cmath>
using namespace std;
typedef long long ll;
typedef long double ld;
typedef pair<int,ll> pii;
const int i_inf = 1e9;
const ll inf = 1e18;
const ll mod = 1000000007;
const ld eps = 1e-13;
const ld pi = 3.14159265359;
mt19937 _rand(time(NULL));
clock_t timer = clock();
const int mxn = 4e6;
const ll A = 911382323;
const ll B = 972663749;
ll modpow(ll x, ll n){
if(n == 0) return 1%mod;
ll u = modpow(x, n/2);
u = (u * u) % mod;
if(n % 2) u = (u * x) % mod;
return u;
}
ll inverse(ll x){
return modpow(x, mod-2);
}
ll add(ll ans, ll val){
ans = (ans + val) % mod;
return ans;
}
ll mul(ll ans, ll val){
ans = (ans * val) % mod;
return ans;
}
ll sub(ll ans, ll val){
ans = (ans - val) % mod;
if(ans < 0) ans += mod;
return ans;
}
ll _div(ll ans, ll val){
ans = (ans * inverse(val)) % mod;
return ans;
}
ll fakt[mxn];
ll bc(ll n, ll k){
return (fakt[n]*inverse((fakt[k]*fakt[n-k])%mod))%mod;
}
ll sq(ll x){
return x*x;
}
ll rsum(ll a, ll b){
return (b-a+1)*(a+b)/2;
}
void prec(){
fakt[0] = 1;
fr(i, 1, mxn){
fakt[i] = mul(fakt[i-1], i);
}
}
int a[mxn], b[mxn];
vector<int> g[mxn];
int col[mxn];
void dfs(int u){
for(auto e : g[u]){
if(col[e] == -1){
col[e] = col[u]^1;
dfs(e);
}
else if(col[u] == col[e]){
cout<<0<<endl;
exit(0);
}
}
}
void solve(){
int n;
cin >> n;
int val[2*n+1];
memset(val, 0, sizeof(val));
int id[2*n+1];
fr(i, 0, n){
cin >> a[i] >> b[i];
val[a[i]] = +1;
val[b[i]] = -1;
id[a[i]] = id[b[i]] = i;
}
set<int> S;
fr(i, 1, 2*n+1){
if(val[i] == 0) continue;
if(val[i] > 0){
S.insert(-i);
}
else{
int c = id[i];
int l = a[c];
S.erase(-l);
for(auto u : S){
if(-u > l){
g[c].pb(id[-u]);
g[id[-u]].pb(c);
}
else break;
}
}
}
ll ans = 1;
memset(col, -1, sizeof(col));
fr(i, 0, n){
if(col[i] != -1) continue;
col[i] = 0;
dfs(i);
ans = mul(ans, 2);
}
cout<<ans<<endl;
}
int main(){
ios_base::sync_with_stdio(false);
cin.tie(NULL);
solve();
return 0;
}
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
59 ms |
109952 KB |
Output is correct |
2 |
Correct |
59 ms |
109944 KB |
Output is correct |
3 |
Correct |
61 ms |
109944 KB |
Output is correct |
4 |
Correct |
60 ms |
109944 KB |
Output is correct |
5 |
Correct |
59 ms |
109944 KB |
Output is correct |
6 |
Correct |
59 ms |
109944 KB |
Output is correct |
7 |
Correct |
67 ms |
109944 KB |
Output is correct |
8 |
Correct |
58 ms |
109944 KB |
Output is correct |
9 |
Correct |
58 ms |
109944 KB |
Output is correct |
10 |
Correct |
59 ms |
109944 KB |
Output is correct |
11 |
Correct |
73 ms |
109944 KB |
Output is correct |
12 |
Correct |
59 ms |
109948 KB |
Output is correct |
13 |
Correct |
59 ms |
109944 KB |
Output is correct |
14 |
Correct |
60 ms |
109944 KB |
Output is correct |
15 |
Correct |
61 ms |
109944 KB |
Output is correct |
16 |
Correct |
59 ms |
109944 KB |
Output is correct |
17 |
Correct |
58 ms |
109948 KB |
Output is correct |
18 |
Correct |
59 ms |
109944 KB |
Output is correct |
19 |
Correct |
59 ms |
109944 KB |
Output is correct |
20 |
Correct |
59 ms |
109944 KB |
Output is correct |
21 |
Correct |
59 ms |
109944 KB |
Output is correct |
22 |
Correct |
59 ms |
109944 KB |
Output is correct |
23 |
Correct |
60 ms |
109944 KB |
Output is correct |
24 |
Correct |
63 ms |
110072 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
59 ms |
109952 KB |
Output is correct |
2 |
Correct |
59 ms |
109944 KB |
Output is correct |
3 |
Correct |
61 ms |
109944 KB |
Output is correct |
4 |
Correct |
60 ms |
109944 KB |
Output is correct |
5 |
Correct |
59 ms |
109944 KB |
Output is correct |
6 |
Correct |
59 ms |
109944 KB |
Output is correct |
7 |
Correct |
67 ms |
109944 KB |
Output is correct |
8 |
Correct |
58 ms |
109944 KB |
Output is correct |
9 |
Correct |
58 ms |
109944 KB |
Output is correct |
10 |
Correct |
59 ms |
109944 KB |
Output is correct |
11 |
Correct |
73 ms |
109944 KB |
Output is correct |
12 |
Correct |
59 ms |
109948 KB |
Output is correct |
13 |
Correct |
59 ms |
109944 KB |
Output is correct |
14 |
Correct |
60 ms |
109944 KB |
Output is correct |
15 |
Correct |
61 ms |
109944 KB |
Output is correct |
16 |
Correct |
59 ms |
109944 KB |
Output is correct |
17 |
Correct |
58 ms |
109948 KB |
Output is correct |
18 |
Correct |
59 ms |
109944 KB |
Output is correct |
19 |
Correct |
59 ms |
109944 KB |
Output is correct |
20 |
Correct |
59 ms |
109944 KB |
Output is correct |
21 |
Correct |
59 ms |
109944 KB |
Output is correct |
22 |
Correct |
59 ms |
109944 KB |
Output is correct |
23 |
Correct |
60 ms |
109944 KB |
Output is correct |
24 |
Correct |
63 ms |
110072 KB |
Output is correct |
25 |
Correct |
60 ms |
110328 KB |
Output is correct |
26 |
Correct |
60 ms |
110460 KB |
Output is correct |
27 |
Correct |
60 ms |
110328 KB |
Output is correct |
28 |
Correct |
61 ms |
110584 KB |
Output is correct |
29 |
Correct |
61 ms |
110404 KB |
Output is correct |
30 |
Correct |
61 ms |
110456 KB |
Output is correct |
31 |
Correct |
69 ms |
110328 KB |
Output is correct |
32 |
Correct |
60 ms |
110328 KB |
Output is correct |
33 |
Correct |
61 ms |
110200 KB |
Output is correct |
34 |
Correct |
60 ms |
110200 KB |
Output is correct |
35 |
Correct |
60 ms |
109944 KB |
Output is correct |
36 |
Correct |
60 ms |
110072 KB |
Output is correct |
37 |
Correct |
109 ms |
126328 KB |
Output is correct |
38 |
Correct |
85 ms |
118136 KB |
Output is correct |
39 |
Correct |
60 ms |
110072 KB |
Output is correct |
40 |
Correct |
59 ms |
109944 KB |
Output is correct |
41 |
Correct |
91 ms |
118264 KB |
Output is correct |
42 |
Correct |
87 ms |
118264 KB |
Output is correct |
43 |
Correct |
60 ms |
110072 KB |
Output is correct |
44 |
Correct |
60 ms |
110072 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
59 ms |
109952 KB |
Output is correct |
2 |
Correct |
59 ms |
109944 KB |
Output is correct |
3 |
Correct |
61 ms |
109944 KB |
Output is correct |
4 |
Correct |
60 ms |
109944 KB |
Output is correct |
5 |
Correct |
59 ms |
109944 KB |
Output is correct |
6 |
Correct |
59 ms |
109944 KB |
Output is correct |
7 |
Correct |
67 ms |
109944 KB |
Output is correct |
8 |
Correct |
58 ms |
109944 KB |
Output is correct |
9 |
Correct |
58 ms |
109944 KB |
Output is correct |
10 |
Correct |
59 ms |
109944 KB |
Output is correct |
11 |
Correct |
73 ms |
109944 KB |
Output is correct |
12 |
Correct |
59 ms |
109948 KB |
Output is correct |
13 |
Correct |
59 ms |
109944 KB |
Output is correct |
14 |
Correct |
60 ms |
109944 KB |
Output is correct |
15 |
Correct |
61 ms |
109944 KB |
Output is correct |
16 |
Correct |
59 ms |
109944 KB |
Output is correct |
17 |
Correct |
58 ms |
109948 KB |
Output is correct |
18 |
Correct |
59 ms |
109944 KB |
Output is correct |
19 |
Correct |
59 ms |
109944 KB |
Output is correct |
20 |
Correct |
59 ms |
109944 KB |
Output is correct |
21 |
Correct |
59 ms |
109944 KB |
Output is correct |
22 |
Correct |
59 ms |
109944 KB |
Output is correct |
23 |
Correct |
60 ms |
109944 KB |
Output is correct |
24 |
Correct |
63 ms |
110072 KB |
Output is correct |
25 |
Correct |
60 ms |
110328 KB |
Output is correct |
26 |
Correct |
60 ms |
110460 KB |
Output is correct |
27 |
Correct |
60 ms |
110328 KB |
Output is correct |
28 |
Correct |
61 ms |
110584 KB |
Output is correct |
29 |
Correct |
61 ms |
110404 KB |
Output is correct |
30 |
Correct |
61 ms |
110456 KB |
Output is correct |
31 |
Correct |
69 ms |
110328 KB |
Output is correct |
32 |
Correct |
60 ms |
110328 KB |
Output is correct |
33 |
Correct |
61 ms |
110200 KB |
Output is correct |
34 |
Correct |
60 ms |
110200 KB |
Output is correct |
35 |
Correct |
60 ms |
109944 KB |
Output is correct |
36 |
Correct |
60 ms |
110072 KB |
Output is correct |
37 |
Correct |
109 ms |
126328 KB |
Output is correct |
38 |
Correct |
85 ms |
118136 KB |
Output is correct |
39 |
Correct |
60 ms |
110072 KB |
Output is correct |
40 |
Correct |
59 ms |
109944 KB |
Output is correct |
41 |
Correct |
91 ms |
118264 KB |
Output is correct |
42 |
Correct |
87 ms |
118264 KB |
Output is correct |
43 |
Correct |
60 ms |
110072 KB |
Output is correct |
44 |
Correct |
60 ms |
110072 KB |
Output is correct |
45 |
Correct |
249 ms |
141304 KB |
Output is correct |
46 |
Correct |
401 ms |
183160 KB |
Output is correct |
47 |
Correct |
185 ms |
127992 KB |
Output is correct |
48 |
Correct |
399 ms |
181128 KB |
Output is correct |
49 |
Correct |
219 ms |
134904 KB |
Output is correct |
50 |
Correct |
373 ms |
179964 KB |
Output is correct |
51 |
Correct |
240 ms |
144888 KB |
Output is correct |
52 |
Correct |
98 ms |
113656 KB |
Output is correct |
53 |
Correct |
115 ms |
118264 KB |
Output is correct |
54 |
Execution timed out |
6123 ms |
898848 KB |
Time limit exceeded |
55 |
Halted |
0 ms |
0 KB |
- |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
59 ms |
109952 KB |
Output is correct |
2 |
Correct |
59 ms |
109944 KB |
Output is correct |
3 |
Correct |
61 ms |
109944 KB |
Output is correct |
4 |
Correct |
60 ms |
109944 KB |
Output is correct |
5 |
Correct |
59 ms |
109944 KB |
Output is correct |
6 |
Correct |
59 ms |
109944 KB |
Output is correct |
7 |
Correct |
67 ms |
109944 KB |
Output is correct |
8 |
Correct |
58 ms |
109944 KB |
Output is correct |
9 |
Correct |
58 ms |
109944 KB |
Output is correct |
10 |
Correct |
59 ms |
109944 KB |
Output is correct |
11 |
Correct |
73 ms |
109944 KB |
Output is correct |
12 |
Correct |
59 ms |
109948 KB |
Output is correct |
13 |
Correct |
59 ms |
109944 KB |
Output is correct |
14 |
Correct |
60 ms |
109944 KB |
Output is correct |
15 |
Correct |
61 ms |
109944 KB |
Output is correct |
16 |
Correct |
59 ms |
109944 KB |
Output is correct |
17 |
Correct |
58 ms |
109948 KB |
Output is correct |
18 |
Correct |
59 ms |
109944 KB |
Output is correct |
19 |
Correct |
59 ms |
109944 KB |
Output is correct |
20 |
Correct |
59 ms |
109944 KB |
Output is correct |
21 |
Correct |
59 ms |
109944 KB |
Output is correct |
22 |
Correct |
59 ms |
109944 KB |
Output is correct |
23 |
Correct |
60 ms |
109944 KB |
Output is correct |
24 |
Correct |
63 ms |
110072 KB |
Output is correct |
25 |
Correct |
60 ms |
110328 KB |
Output is correct |
26 |
Correct |
60 ms |
110460 KB |
Output is correct |
27 |
Correct |
60 ms |
110328 KB |
Output is correct |
28 |
Correct |
61 ms |
110584 KB |
Output is correct |
29 |
Correct |
61 ms |
110404 KB |
Output is correct |
30 |
Correct |
61 ms |
110456 KB |
Output is correct |
31 |
Correct |
69 ms |
110328 KB |
Output is correct |
32 |
Correct |
60 ms |
110328 KB |
Output is correct |
33 |
Correct |
61 ms |
110200 KB |
Output is correct |
34 |
Correct |
60 ms |
110200 KB |
Output is correct |
35 |
Correct |
60 ms |
109944 KB |
Output is correct |
36 |
Correct |
60 ms |
110072 KB |
Output is correct |
37 |
Correct |
109 ms |
126328 KB |
Output is correct |
38 |
Correct |
85 ms |
118136 KB |
Output is correct |
39 |
Correct |
60 ms |
110072 KB |
Output is correct |
40 |
Correct |
59 ms |
109944 KB |
Output is correct |
41 |
Correct |
91 ms |
118264 KB |
Output is correct |
42 |
Correct |
87 ms |
118264 KB |
Output is correct |
43 |
Correct |
60 ms |
110072 KB |
Output is correct |
44 |
Correct |
60 ms |
110072 KB |
Output is correct |
45 |
Correct |
249 ms |
141304 KB |
Output is correct |
46 |
Correct |
401 ms |
183160 KB |
Output is correct |
47 |
Correct |
185 ms |
127992 KB |
Output is correct |
48 |
Correct |
399 ms |
181128 KB |
Output is correct |
49 |
Correct |
219 ms |
134904 KB |
Output is correct |
50 |
Correct |
373 ms |
179964 KB |
Output is correct |
51 |
Correct |
240 ms |
144888 KB |
Output is correct |
52 |
Correct |
98 ms |
113656 KB |
Output is correct |
53 |
Correct |
115 ms |
118264 KB |
Output is correct |
54 |
Execution timed out |
6123 ms |
898848 KB |
Time limit exceeded |
55 |
Halted |
0 ms |
0 KB |
- |