Advertisement
Not a member of Pastebin yet?
Sign Up,
it unlocks many cool features!
- //Nguyen Huu Hoang Minh
- #include <bits/stdc++.h>
- #define sz(x) int(x.size())
- #define all(x) x.begin(),x.end()
- #define reset(x) memset(x, 0,sizeof(x))
- #define pb push_back
- #define mp make_pair
- #define fi first
- #define se second
- #define N 100050
- #define remain(x) if (x > MOD) x -= MOD
- #define ii pair<int, int>
- #define iiii pair< ii , ii >
- #define viiii vector< iiii >
- #define vi vector<int>
- #define vii vector< ii >
- #define bit(x, i) (((x) >> (i)) & 1)
- #define Task "test"
- #define int long long
- using namespace std;
- typedef long double ld;
- const int inf = 1e10;
- const int minf = -1e10;
- const int mod = 1000000007;
- int n, a[N];
- ii bit[N];
- void readfile()
- {
- ios_base::sync_with_stdio(false);
- cin.tie(0);cout.tie(0);
- if (fopen(Task".inp","r"))
- {
- freopen(Task".inp","r",stdin);
- //freopen(Task".out","w",stdout);
- }
- cin >> n;
- for(int i=1; i<=n; i++) cin >> a[i];
- }
- void compress()
- {
- set<int> s(a+1,a+1+n);
- vector<int> b(s.begin(),s.end());
- for(int i=1; i<=n; i++)
- {
- int x = a[i];
- int k = lower_bound(b.begin(),b.end(),x)-b.begin()+1;
- a[i] = k;
- }
- }
- ii get(int x)
- {
- ii ans = ii(0,0);
- for(; x > 0; x -= x & -x)
- {
- if (bit[x].fi > ans.fi)
- {
- ans = bit[x];
- }
- else if (bit[x].fi == ans.fi)
- {
- ans.se = (ans.se + bit[x].se)%mod;
- }
- }
- if (ans.fi==0) return ii(1,1);
- else ans.fi++;
- return ans;
- }
- void up(int x, ii val)
- {
- for(; x <= N; x += x & -x)
- {
- if (val.fi > bit[x].fi)
- {
- bit[x] = val;
- }
- else if (bit[x].fi == val.fi){
- bit[x].se = (bit[x].se + val.se)%mod;
- }
- }
- }
- void proc()
- {
- compress();
- for(int i=1; i<=n; i++)
- {
- ii p = get(a[i]-1);
- up(a[i],p);
- }
- cout << get(N-1).se;
- }
- signed main()
- {
- readfile();
- proc();
- return 0;
- }
Advertisement
Add Comment
Please, Sign In to add comment
Advertisement