Submission #256880

#	Time	Username	Problem	Language	Result	Execution time	Memory
256880		blacktulip	Bigger segments (IZhO19_segments)	C++17	100 / 100	136 ms	17000 KiB

segments

#pragma GCC optimize("Ofast,no-stack-protector,unroll-loops,fast-math")
#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")

#include <bits/stdc++.h>

using namespace std;

typedef long long lo;
typedef pair< lo,lo > PII;

#define fi first
#define se second
#define mp make_pair
#define endl "\n"
#define int long long
#define pb push_back
#define fio() ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL)
#define FOR for(int i=1;i<=n;i++)
#define mid ((start+end)/2)
#define ort ((bas+son)/2)

const lo inf = 1000000000000000000;
const lo KOK = 100000;
const lo LOG = 30;
const lo li = 500005;
const lo mod = 1000000007;

int n,m,b[li],a[li],k,flag,t,dp[li],tim[li];
int cev;
string s;
vector<int> v;

main(void){
	scanf("%lld",&n);
	FOR{
		scanf("%lld",&a[i]);
		a[i]+=a[i-1];
	}
	FOR{
		tim[i]=max(tim[i],tim[i-1]);
		dp[i]=dp[tim[i]]+1;
		int bas=1;
		int son=n;
		while(bas<=son){
			if(a[i]+a[i]-a[tim[i]]>a[ort])bas=ort+1;
			else son=ort-1;
		}
		tim[bas]=max(tim[bas],i);
	}
	printf("%lld\n",dp[n]);
	return 0;
}

Compilation message (stderr)

segments.cpp:33:10: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
 main(void){
          ^
segments.cpp: In function 'int main()':
segments.cpp:34:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%lld",&n);
  ~~~~~^~~~~~~~~~~
segments.cpp:36:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%lld",&a[i]);
   ~~~~~^~~~~~~~~~~~~~

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