This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
using namespace std;
#define sp << " " <<
#define int long long
#define vi vector<int>
#define F(xxx,yyy) for (int xxx=1;xxx<=yyy;xxx++)
#define pii pair<int,int>
#define pb push_back
const int N = 5e5+1;
const int inf = 1e9+1;
const int MOD = 1e9+7;
int mult(int x,int y) {return ((x%MOD)*(y%MOD))%MOD;}
void solve() {
int n,m;
cin >> n >> m;
vi edges[n+1];
F(i,n-1) {
int a,b;
cin >> a >> b;
edges[a].pb(b);
edges[b].pb(a);
}
vi beg[n+1];
while (m--){
int l,r;
cin >> l >> r;
beg[l].pb(r);
}
F(i,n-1) beg[i].push_back(i+1);
priority_queue<int,vi,greater<int>> cur_segs;
int ans = 1;
F(i,n) {
while (!cur_segs.empty() && cur_segs.top() == i) cur_segs.pop();
if (i>1 && cur_segs.empty()) {
ans = mult(ans,2);
}
for (auto it : beg[i]) cur_segs.push(it);
}
cout << ans << endl;
}
signed main() {
ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
#ifdef Local
freopen("in","r",stdin);
freopen("out","w",stdout);
#endif
int t = 1;
//cin >> t;
F(i,t) solve();
}
# | Verdict | Execution time | Memory | Grader output |
---|
Fetching results... |
# | Verdict | Execution time | Memory | Grader output |
---|
Fetching results... |
# | Verdict | Execution time | Memory | Grader output |
---|
Fetching results... |
# | Verdict | Execution time | Memory | Grader output |
---|
Fetching results... |
# | Verdict | Execution time | Memory | Grader output |
---|
Fetching results... |
# | Verdict | Execution time | Memory | Grader output |
---|
Fetching results... |
# | Verdict | Execution time | Memory | Grader output |
---|
Fetching results... |
# | Verdict | Execution time | Memory | Grader output |
---|
Fetching results... |
# | Verdict | Execution time | Memory | Grader output |
---|
Fetching results... |
# | Verdict | Execution time | Memory | Grader output |
---|
Fetching results... |