Submission #331603

#	Time	Username	Problem	Language	Result	Execution time	Memory
331603		limabeans	Money (IZhO17_money)	C++17	0 / 100	1 ms	364 KiB

money

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

template<typename T>
void out(T x) { cout << x << endl; exit(0); }
#define watch(x) cout << (#x) << " is " << (x) << endl





using ll = long long;


const int maxn = 1e6 + 5;




int n;
int a[maxn];

int main() {
    ios_base::sync_with_stdio(false); cin.tie(0);  cout.tie(0);

    cin>>n;
    for (int i=0; i<n; i++) {
	cin>>a[i];
	--a[i];
    }


    set<int> act;
    for (int i=0; i<n; i++) {
	act.insert(i);
    }

    int res = 0;

    
    for (int i=n-1; i>=0; ) {
	res++;
	vector<int> rm={a[i]};
	auto iter = act.lower_bound(a[i]);
	while (true) {
	    --i;
	    if (i<0) break;
	    if (iter==act.begin()) break;
	    --iter;
	    if (a[i]!=*iter) break;
	    rm.push_back(*iter);
	}

	for (int x: rm) act.erase(x);
    }


    cout<<res<<endl;    
    return 0;
}

• Subtask 1: 0 / 9
• Subtask 2: 0 / 16
• Subtask 3: 0 / 20
• Subtask 4: 0 / 55