Submission #554245

#	Time	Username	Problem	Language	Result	Execution time	Memory
554245		Gurban	Gap (APIO16_gap)	C++17	0 / 100	3093 ms	2276 KiB

gap

#include "bits/stdc++.h"
#include "gap.h"
using namespace std;

using ll = long long;

// const int maxn=1e5+5;
// ll a[maxn];

long long findGap(int T, int N)
{
	ll cep,sag;
	if(T == 1){
		vector<ll>v;
		v.push_back(cep);		
		v.push_back(sag);		
		while(cep < sag){
			ll cp,sg;
			MinMax(cep+1,sag-1,&cp,&sg);
			if(cp != -1){
				v.push_back(cp);
				if(cp == sg) break;
				v.push_back(sg);
				cep = cp;
				sag = sg;
			}
		}
		sort(v.begin(),v.end());
		ll ans = 0;
		for(int i = 1;i < (int)v.size();i++) ans = max(ans,v[i] - v[i - 1]);
		return ans;
	}
	// assert(cep != -1 && sag != -1);
	ll now = cep,ans = 1;
	while(now < sag){
		ll nwa,nwb;
		if(now + ans + 1 > sag) break;
		MinMax(now + 1,now + ans + 1,&nwa,&nwb);
		if(nwa != -1){
			ans = max(ans,nwa - now);
			now = nwb;
			
			continue;
		}
		ans++;
		while(1){
			MinMax(now + 1,now + ans * 2,&nwa,&nwb);
			if(nwa != -1){
				ans = max(nwa - now,ans);
				now = nwb;
				break;
			}
			ans *= 2;
			ans++;
		}
	}
	return ans;
}

Compilation message (stderr)

gap.cpp: In function 'long long int findGap(int, int)':
gap.cpp:34:5: warning: 'cep' may be used uninitialized in this function [-Wmaybe-uninitialized]
   34 |  ll now = cep,ans = 1;
      |     ^~~
gap.cpp:35:12: warning: 'sag' may be used uninitialized in this function [-Wmaybe-uninitialized]
   35 |  while(now < sag){
      |        ~~~~^~~~~

• Subtask 1: 0 / 30
• Subtask 2: 0 / 70