Submission #201389

#	Time	Username	Problem	Language	Result	Execution time	Memory
201389		guangxuan	Bigger segments (IZhO19_segments)	C++14	100 / 100	162 ms	15324 KiB

segments

#include <bits/stdc++.h>

using namespace std;

int a[500009];
long long rs[500009];

int main(){
	int n;
	scanf("%d",&n);
	for(int i=0;i<n;i++){
		scanf("%d",&a[i]);
		rs[i+1]=rs[i]+a[i];
	}
	pair<int,int> res = {0,0};
	pair<int,long long> dp;
	priority_queue<pair<long long,pair<int,int> >,vector<pair<long long,pair<int,int> > >, greater< pair<long long,pair<int,int> > > > updates;
	for(int i=1;i<=n;i++){
		while(updates.size() && updates.top().first<=rs[i]){
			pair<int,int> cur = updates.top().second;
			updates.pop();
			res = max(res,cur);
		}
		dp = {res.first,rs[res.second] - rs[i]};
		dp.first++;
		updates.push({rs[i]-dp.second,{dp.first,i}});
		//cout << dp[i].first << ' ' << dp[i].second << '\n';
		// cout << res.first << ' ' << res.second.first << ' ' << res.second.second << '\n';
	}
	printf("%d", dp.first);
}

Compilation message (stderr)

segments.cpp: In function 'int main()':
segments.cpp:10:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d",&n);
  ~~~~~^~~~~~~~~
segments.cpp:12:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d",&a[i]);
   ~~~~~^~~~~~~~~~~~

• Subtask 1: 13 / 13
• Subtask 2: 14 / 14
• Subtask 3: 10 / 10
• Subtask 4: 36 / 36
• Subtask 5: 27 / 27