Submission #978333

#	Time	Username	Problem	Language	Result	Execution time	Memory
978333		Amr	Boat (APIO16_boat)	C++17	31 / 100	2032 ms	189796 KiB

boat

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef long double ld;
#define S second
#define F first
#define all(x) (x).begin(),(x).end()
#define sz size()
#define Yes cout << "YES" << endl
#define No cout << "NO" << endl
#define pb(x) push_back(x);
#define endl '\n'
#define fast ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
const int N=502;
ll INF=INT_MAX,mod=1e9+7;
int TT=1;
ll power(ll x, unsigned int y)
{
    ll res = 1;
    x = x; // % mod;
    if (x == 0) return 0;
    while (y > 0)
    {
        if (y & 1) res = (res*x)  ; // % mod;
        y = y>>1;
        x = (x*x) ; // % mod;
    }
    return res;
}
ll k = 1;
const int M = 1e6+2, logn = 32;
ll seg[M*logn+M];
ll L[M*logn+M], R[M*logn+M];
ll a[N], b[N];
ll n,siz = 1;
void upd(ll node, ll in , ll val , ll lx = 0, ll rx = siz)
{
    if(rx-lx==1) {seg[node] += val; return;}
    ll mid = (lx+rx)/2;
    if(L[node]==0) L[node] = k++, R[node] = k++;
    if(in<mid) upd(L[node],in,val,lx,mid);
    else upd(R[node],in,val,mid,rx);
    seg[node] = (seg[L[node]]+seg[R[node]])%mod;
}
ll get(ll node, ll l , ll r, ll lx = 0, ll rx = siz)
{
    if(lx>=r||rx<=l) return 0;
    if(lx>=l&&rx<=r) return seg[node];
    ll mid = (lx+rx)/2;
    if(L[node]==0) L[node] = k++, R[node] = k++;
    return (get(L[node],l,r,lx,mid) + get(R[node],l,r,mid,rx))%mod;
}
void solve()
{
    cin >> n;
    siz = 1e9+1;
    for(int i = 1; i <= n; i++) cin >> a[i] >> b[i];
    upd(0,0,1);
    for(int i = 1; i <= n; i++)
    {
        for(int j = b[i]; j >= a[i]; j--)
        {
            ll ans = get(0,0,j);
            upd(0,j,ans);
        }
    }
    cout << (get(0,1,siz)+mod)%mod << endl;
}
int main(){
    //freopen("friday.in","r",stdin);
    //freopen("friday.out","w",stdout);
    fast;
    while(TT--)
        solve();

    return 0;
}

• Subtask 1: 9 / 9
• Subtask 2: 22 / 22
• Subtask 3: 0 / 27
• Subtask 4: 0 / 42