Submission #377004

#	Time	Username	Problem	Language	Result	Execution time	Memory
377004		jamielim	Bigger segments (IZhO19_segments)	C++14	0 / 100	1 ms	512 KiB

segments

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

#define fi first
#define se second
#define mp make_pair
#define pb emplace_back
#define ALL(x) x.begin(),x.end()
#define SZ(x) (int)x.size()
typedef long long ll;
typedef pair<int,int> ii;
typedef pair<ii,ii> i4;
const int MOD=1000000007;
const int INF=1012345678;
const ll LLINF=1012345678012345678LL;
const double PI=3.1415926536;
const double EPS=1e-14;

int n;
ll arr[500005];
ll pre[500005];
ll sz[500005];
int ans[500005];

int main(){
	scanf("%d",&n);
	for(int i=0;i<n;i++){
		scanf("%lld",&arr[i]);
		if(i==0)pre[0]=arr[0];
		else pre[i]=pre[i-1]+arr[i];
	}
	queue<pair<ll,int> > q;
	sz[0]=arr[0];ans[0]=1;
	q.push(mp(sz[0]+pre[0],0));
	for(int i=1;i<n;i++){
		sz[i]=sz[i-1]+arr[i];
		ans[i]=ans[i-1];
		while(!q.empty()&&q.front().fi<=pre[i]){
			sz[i]=pre[i]-pre[q.front().se];
			ans[i]=ans[q.front().se]+1;
			q.pop();
		}
		q.push(mp(sz[i]+pre[i],i));
	}
	printf("%d",ans[n-1]);
}
// sz[j]<=pre[i]-pre[j] -> sz[j]+pre[j]<=pre[i]

Compilation message (stderr)

segments.cpp: In function 'int main()':
segments.cpp:26:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   26 |  scanf("%d",&n);
      |  ~~~~~^~~~~~~~~
segments.cpp:28:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   28 |   scanf("%lld",&arr[i]);
      |   ~~~~~^~~~~~~~~~~~~~~~

• Subtask 1: 0 / 13
• Subtask 2: 0 / 14
• Subtask 3: 0 / 10
• Subtask 4: 0 / 36
• Subtask 5: 0 / 27