Submission #781590

#	Time	Username	Problem	Language	Result	Execution time	Memory
781590		Dan4Life	Fish 2 (JOI22_fish2)	C++17	0 / 100	13 ms	2864 KiB

fish2

#include <bits/stdc++.h>
using namespace std;
#define int long long 
int n, q, a[100010], pr[100010];
using ar = array<int,2>;
 
int32_t main()
{
	ios_base::sync_with_stdio(false); cin.tie(0);
	cin >> n;
	for(int i = 1; i <= n; i++) cin >> a[i];
	cin >> q; a[n+1] = (int)1e18;
	while(q--){
		int t, l, r; cin >> t >> l >> r;
		if(t==1) a[l]=r;
		else{
			stack<ar> S; int sum = 0, ind;
			for(int i = l; i <= r; i++)pr[i]=0;
			for(int i = l; i <= r; i++){
				sum = 0, ind = -1;
				while(!S.empty() and a[S.top()[1]] < a[i]) 
					sum+=S.top()[0]+a[S.top()[1]], S.pop();
				if(sum<a[i]) ind=S.empty()?l:(S.top()[1]+1);
				if(ind!=-1 and ind<i) pr[ind]++, pr[i]--;
				S.push({sum,i});
			}
			S = stack<ar>();
			for(int i = r+1; i > l; i--){
				sum = 0, ind = -1;
				while(!S.empty() and a[S.top()[1]] < a[i]) 
					sum+=S.top()[0]+a[S.top()[1]], S.pop();
				if(sum<a[i]) ind=S.empty()?n:S.top()[1];
				if(ind!=-1 and i+1<ind) pr[i+1]++, pr[ind]--;
				S.push({sum,i});
			}
			int ans = 0, xd=0;
			for(int i = l; i <= r; i++)
				xd+=pr[i], ans+=!xd;
			cout << ans << "\n";
		}
	}
}

• Subtask 1: 0 / 5
• Subtask 2: 0 / 8
• Subtask 3: 0 / 12
• Subtask 4: 0 / 23
• Subtask 5: 0 / 35
• Subtask 6: 0 / 17