Submission #888090

#	Time	Username	Problem	Language	Result	Execution time	Memory
888090		votranngocvy	Po (COCI21_po)	C++14	70 / 70	32 ms	10576 KiB

Main

#include <bits/stdc++.h>
using namespace std;

#define ll long long
#define pii pair<ll,int>
#define fi first
#define se second
#define mp make_pair
const int N = 1e5 + 5;
const int inf = 0x3f3f3f3f;
int n;
ll a[N],ans;
pii st[4 * N];

pii merge(pii a,pii b) {
    if (a.fi <= b.fi) return a;
    else return b;
}

void build(int id,int l,int r) {
    if (l == r) {
        st[id] = mp(a[l],l);
        return;
    }
    int mid = (l + r) / 2;
    build(id * 2,l,mid);
    build(id * 2 + 1,mid + 1,r);
    st[id] = merge(st[id * 2],st[id * 2 + 1]);
} 

pii get(int id,int l,int r,int u,int v) {
    if (v < l || r < u) return mp(inf,-1);
    if (u <= l && r <= v) return st[id];
    int mid = (l + r) / 2;
    return merge(get(id * 2,l,mid,u,v),get(id * 2 + 1,mid + 1,r,u,v));
}

void calc(int l,int r,int val) {
    if (l > r) return;
    pii tmp = get(1,1,n,l,r);
    ans += ((tmp.fi - val) != 0);
    calc(l,tmp.se - 1,tmp.fi);
    calc(tmp.se + 1,r,tmp.fi);
}

signed main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);
    cin >> n;
    for (int i = 1; i <= n; i++) cin >> a[i];
    build(1,1,n);
    calc(1,n,0);
    cout << ans << "\n";
}

• Subtask 1: 70 / 70