#include<bits/stdc++.h>
#include<fstream>
using namespace std;
#define sz(a) (int)a.size()
#define ALL(v) v.begin(), v.end()
#define ALLR(v) v.rbegin(), v.rend()
#define ll long long
#define pb push_back
#define forr(i, a, b) for(int i = a; i < b; i++)
#define dorr(i, a, b) for(int i = a; i >= b; i--)
#define ld long double
#define vt vector
#include<fstream>
#define fi first
#define se second
#define pll pair<ll, ll>
#define pii pair<int, int>
#define mpp make_pair
const ld PI = 3.14159265359, prec = 1e-9;;
//using u128 = __uint128_t;
//const int x[4] = {1, 0, -1, 0};
//const int y[4] = {0, -1, 0, 1};
const ll mod = 1e9 + 7, pr = 31;
const int mxn = 1e5 + 5, mxq = 1e5 + 5, sq = 500, mxv = 5e4 + 1;
//const int base = (1 <<18);
const ll inf = 1e9 + 5, neg = -69420, inf2 = 1e14;
mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());
// have fun!
//JOIIIIIIIIIIIIIII
int n;
int c[mxn + 1];
pii p[mxn + 1];
vt<int>adj[mxn + 1];
bool bad = 0, used[mxn + 1];
void dfs(int s){
for(auto i: adj[s]){
if(c[i] == -1){
c[i] = c[s] ^ 1; dfs(i);
}else if(c[i] != (c[s] ^ 1))bad = 1;
}
}
void solve(){
cin >> n;
for(int i = 1; i <= n; i++)cin >> p[i].fi >> p[i].se;
sort(p + 1, p + n + 1);
for(int i = 1; i <= n; i++){
for(int j = i + 1; j <= n; j++){
for(int k = j + 1; k <= n; k++){
if(p[i].se < p[j].se && p[j].se < p[k].se && p[i].se > p[k].fi){
cout << 0;
return;
}
}
}
}
for(int i = 1; i <= n; i++){
for(int j = i + 1; j <= n; j++){
if(p[j].fi < p[i].se && p[i].se < p[j].se){
adj[i].pb(j); adj[j].pb(i);
}
}
}
ll ans = 1;
for(int i = 1; i <= n; i++)c[i] = -1;
for(int i = 1; i <= n; i++){
if(c[i] == -1){
c[i] = 1; dfs(i);
ans = (ans * 2) % mod;
}
}
if(bad)assert(0);
if(bad){
cout << 0; return;
}
cout << ans;
}
signed main(){
ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
//freopen("DATA.inp", "r", stdin);
//freopen("DATA.out", "w", stdout);
int tt; tt = 1;
while(tt--){
solve();
}
return(0);
}
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
1 ms |
2648 KB |
Output is correct |
2 |
Correct |
1 ms |
2652 KB |
Output is correct |
3 |
Correct |
1 ms |
2652 KB |
Output is correct |
4 |
Correct |
1 ms |
2648 KB |
Output is correct |
5 |
Correct |
2 ms |
2648 KB |
Output is correct |
6 |
Correct |
1 ms |
2652 KB |
Output is correct |
7 |
Correct |
1 ms |
2652 KB |
Output is correct |
8 |
Correct |
2 ms |
2652 KB |
Output is correct |
9 |
Correct |
1 ms |
2652 KB |
Output is correct |
10 |
Correct |
1 ms |
2652 KB |
Output is correct |
11 |
Correct |
1 ms |
2652 KB |
Output is correct |
12 |
Correct |
1 ms |
2820 KB |
Output is correct |
13 |
Correct |
1 ms |
2652 KB |
Output is correct |
14 |
Correct |
1 ms |
2652 KB |
Output is correct |
15 |
Correct |
1 ms |
2652 KB |
Output is correct |
16 |
Correct |
1 ms |
2648 KB |
Output is correct |
17 |
Correct |
1 ms |
2804 KB |
Output is correct |
18 |
Correct |
1 ms |
2652 KB |
Output is correct |
19 |
Correct |
1 ms |
2652 KB |
Output is correct |
20 |
Correct |
1 ms |
2648 KB |
Output is correct |
21 |
Correct |
1 ms |
2652 KB |
Output is correct |
22 |
Correct |
1 ms |
2652 KB |
Output is correct |
23 |
Correct |
1 ms |
2652 KB |
Output is correct |
24 |
Correct |
1 ms |
2652 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
1 ms |
2648 KB |
Output is correct |
2 |
Correct |
1 ms |
2652 KB |
Output is correct |
3 |
Correct |
1 ms |
2652 KB |
Output is correct |
4 |
Correct |
1 ms |
2648 KB |
Output is correct |
5 |
Correct |
2 ms |
2648 KB |
Output is correct |
6 |
Correct |
1 ms |
2652 KB |
Output is correct |
7 |
Correct |
1 ms |
2652 KB |
Output is correct |
8 |
Correct |
2 ms |
2652 KB |
Output is correct |
9 |
Correct |
1 ms |
2652 KB |
Output is correct |
10 |
Correct |
1 ms |
2652 KB |
Output is correct |
11 |
Correct |
1 ms |
2652 KB |
Output is correct |
12 |
Correct |
1 ms |
2820 KB |
Output is correct |
13 |
Correct |
1 ms |
2652 KB |
Output is correct |
14 |
Correct |
1 ms |
2652 KB |
Output is correct |
15 |
Correct |
1 ms |
2652 KB |
Output is correct |
16 |
Correct |
1 ms |
2648 KB |
Output is correct |
17 |
Correct |
1 ms |
2804 KB |
Output is correct |
18 |
Correct |
1 ms |
2652 KB |
Output is correct |
19 |
Correct |
1 ms |
2652 KB |
Output is correct |
20 |
Correct |
1 ms |
2648 KB |
Output is correct |
21 |
Correct |
1 ms |
2652 KB |
Output is correct |
22 |
Correct |
1 ms |
2652 KB |
Output is correct |
23 |
Correct |
1 ms |
2652 KB |
Output is correct |
24 |
Correct |
1 ms |
2652 KB |
Output is correct |
25 |
Correct |
1027 ms |
3088 KB |
Output is correct |
26 |
Correct |
925 ms |
3088 KB |
Output is correct |
27 |
Correct |
1020 ms |
3152 KB |
Output is correct |
28 |
Correct |
940 ms |
3340 KB |
Output is correct |
29 |
Correct |
995 ms |
3084 KB |
Output is correct |
30 |
Correct |
991 ms |
3156 KB |
Output is correct |
31 |
Correct |
1030 ms |
3100 KB |
Output is correct |
32 |
Correct |
987 ms |
3088 KB |
Output is correct |
33 |
Correct |
920 ms |
2836 KB |
Output is correct |
34 |
Correct |
151 ms |
2648 KB |
Output is correct |
35 |
Correct |
837 ms |
2844 KB |
Output is correct |
36 |
Correct |
841 ms |
2828 KB |
Output is correct |
37 |
Correct |
1 ms |
2652 KB |
Output is correct |
38 |
Correct |
1 ms |
2652 KB |
Output is correct |
39 |
Correct |
832 ms |
2832 KB |
Output is correct |
40 |
Correct |
1018 ms |
2832 KB |
Output is correct |
41 |
Correct |
970 ms |
11020 KB |
Output is correct |
42 |
Correct |
956 ms |
11092 KB |
Output is correct |
43 |
Runtime error |
856 ms |
5648 KB |
Execution killed with signal 6 |
44 |
Halted |
0 ms |
0 KB |
- |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
1 ms |
2648 KB |
Output is correct |
2 |
Correct |
1 ms |
2652 KB |
Output is correct |
3 |
Correct |
1 ms |
2652 KB |
Output is correct |
4 |
Correct |
1 ms |
2648 KB |
Output is correct |
5 |
Correct |
2 ms |
2648 KB |
Output is correct |
6 |
Correct |
1 ms |
2652 KB |
Output is correct |
7 |
Correct |
1 ms |
2652 KB |
Output is correct |
8 |
Correct |
2 ms |
2652 KB |
Output is correct |
9 |
Correct |
1 ms |
2652 KB |
Output is correct |
10 |
Correct |
1 ms |
2652 KB |
Output is correct |
11 |
Correct |
1 ms |
2652 KB |
Output is correct |
12 |
Correct |
1 ms |
2820 KB |
Output is correct |
13 |
Correct |
1 ms |
2652 KB |
Output is correct |
14 |
Correct |
1 ms |
2652 KB |
Output is correct |
15 |
Correct |
1 ms |
2652 KB |
Output is correct |
16 |
Correct |
1 ms |
2648 KB |
Output is correct |
17 |
Correct |
1 ms |
2804 KB |
Output is correct |
18 |
Correct |
1 ms |
2652 KB |
Output is correct |
19 |
Correct |
1 ms |
2652 KB |
Output is correct |
20 |
Correct |
1 ms |
2648 KB |
Output is correct |
21 |
Correct |
1 ms |
2652 KB |
Output is correct |
22 |
Correct |
1 ms |
2652 KB |
Output is correct |
23 |
Correct |
1 ms |
2652 KB |
Output is correct |
24 |
Correct |
1 ms |
2652 KB |
Output is correct |
25 |
Correct |
1027 ms |
3088 KB |
Output is correct |
26 |
Correct |
925 ms |
3088 KB |
Output is correct |
27 |
Correct |
1020 ms |
3152 KB |
Output is correct |
28 |
Correct |
940 ms |
3340 KB |
Output is correct |
29 |
Correct |
995 ms |
3084 KB |
Output is correct |
30 |
Correct |
991 ms |
3156 KB |
Output is correct |
31 |
Correct |
1030 ms |
3100 KB |
Output is correct |
32 |
Correct |
987 ms |
3088 KB |
Output is correct |
33 |
Correct |
920 ms |
2836 KB |
Output is correct |
34 |
Correct |
151 ms |
2648 KB |
Output is correct |
35 |
Correct |
837 ms |
2844 KB |
Output is correct |
36 |
Correct |
841 ms |
2828 KB |
Output is correct |
37 |
Correct |
1 ms |
2652 KB |
Output is correct |
38 |
Correct |
1 ms |
2652 KB |
Output is correct |
39 |
Correct |
832 ms |
2832 KB |
Output is correct |
40 |
Correct |
1018 ms |
2832 KB |
Output is correct |
41 |
Correct |
970 ms |
11020 KB |
Output is correct |
42 |
Correct |
956 ms |
11092 KB |
Output is correct |
43 |
Runtime error |
856 ms |
5648 KB |
Execution killed with signal 6 |
44 |
Halted |
0 ms |
0 KB |
- |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
1 ms |
2648 KB |
Output is correct |
2 |
Correct |
1 ms |
2652 KB |
Output is correct |
3 |
Correct |
1 ms |
2652 KB |
Output is correct |
4 |
Correct |
1 ms |
2648 KB |
Output is correct |
5 |
Correct |
2 ms |
2648 KB |
Output is correct |
6 |
Correct |
1 ms |
2652 KB |
Output is correct |
7 |
Correct |
1 ms |
2652 KB |
Output is correct |
8 |
Correct |
2 ms |
2652 KB |
Output is correct |
9 |
Correct |
1 ms |
2652 KB |
Output is correct |
10 |
Correct |
1 ms |
2652 KB |
Output is correct |
11 |
Correct |
1 ms |
2652 KB |
Output is correct |
12 |
Correct |
1 ms |
2820 KB |
Output is correct |
13 |
Correct |
1 ms |
2652 KB |
Output is correct |
14 |
Correct |
1 ms |
2652 KB |
Output is correct |
15 |
Correct |
1 ms |
2652 KB |
Output is correct |
16 |
Correct |
1 ms |
2648 KB |
Output is correct |
17 |
Correct |
1 ms |
2804 KB |
Output is correct |
18 |
Correct |
1 ms |
2652 KB |
Output is correct |
19 |
Correct |
1 ms |
2652 KB |
Output is correct |
20 |
Correct |
1 ms |
2648 KB |
Output is correct |
21 |
Correct |
1 ms |
2652 KB |
Output is correct |
22 |
Correct |
1 ms |
2652 KB |
Output is correct |
23 |
Correct |
1 ms |
2652 KB |
Output is correct |
24 |
Correct |
1 ms |
2652 KB |
Output is correct |
25 |
Correct |
1027 ms |
3088 KB |
Output is correct |
26 |
Correct |
925 ms |
3088 KB |
Output is correct |
27 |
Correct |
1020 ms |
3152 KB |
Output is correct |
28 |
Correct |
940 ms |
3340 KB |
Output is correct |
29 |
Correct |
995 ms |
3084 KB |
Output is correct |
30 |
Correct |
991 ms |
3156 KB |
Output is correct |
31 |
Correct |
1030 ms |
3100 KB |
Output is correct |
32 |
Correct |
987 ms |
3088 KB |
Output is correct |
33 |
Correct |
920 ms |
2836 KB |
Output is correct |
34 |
Correct |
151 ms |
2648 KB |
Output is correct |
35 |
Correct |
837 ms |
2844 KB |
Output is correct |
36 |
Correct |
841 ms |
2828 KB |
Output is correct |
37 |
Correct |
1 ms |
2652 KB |
Output is correct |
38 |
Correct |
1 ms |
2652 KB |
Output is correct |
39 |
Correct |
832 ms |
2832 KB |
Output is correct |
40 |
Correct |
1018 ms |
2832 KB |
Output is correct |
41 |
Correct |
970 ms |
11020 KB |
Output is correct |
42 |
Correct |
956 ms |
11092 KB |
Output is correct |
43 |
Runtime error |
856 ms |
5648 KB |
Execution killed with signal 6 |
44 |
Halted |
0 ms |
0 KB |
- |