Submission #1320754

#	Time	Username	Problem	Language	Result	Execution time	Memory
1320754		crispxx	Gap (APIO16_gap)	C++20	100 / 100	47 ms	1204 KiB

gap

#include "gap.h"

#include <bits/stdc++.h>

using namespace std;

using ll = long long;

bool chmax(ll &a, const ll &b) {
	return a < b ? a = b, true : false;
}

long long findGap(int T, int n) {
	if(T == 1) {
		ll l = 0, r = 1e18;
		
		ll ans = 0, cnt = 0;
		
		bool flag = true;
		
		while(l <= r && cnt < n) {
			ll mn, mx;
			
			MinMax(l, r, &mn, &mx);
			
			if(mn == -1) {
				chmax(ans, (r + 1) - (l - 1));
				break;
			}
			
			if(!flag) {
				chmax(ans, mn - (l - 1));
				chmax(ans, (r + 1) - mx);
			}
			
			cnt += 2;
			
			flag = false;
			
			l = mn + 1, r = mx - 1;
		}
		
		if(l <= r) {
			chmax(ans, (r + 1) - (l - 1));
		}
		
		// for(int i = 1; i < (int)a.size(); i++) {
			// ans = max(ans, a[i] - a[i - 1]);
		// }
		
		return ans;
	} else {
		ll L, R;
		
		MinMax(0, 1e18, &L, &R);
		
		ll lmn = L, lmx = L;
		
		ll B = (R-L+n-2) / (n-1);
		L ++ ;
		ll ans = B;
		
		
		for(int i = 0; 1; i++) {
			ll cl = i * B + L, cr = min(L + (i + 1) * B - 1, R);
			if(cl>R)break;
			
			ll mn, mx;
			
			MinMax(cl, cr, &mn, &mx);
			
			// cout << cl << ' ' << cr << ' ' << mn << ' ' << mx << '\n';
			
			if(lmn != -1 && mn != -1) {
				chmax(ans, mn - lmx);
			}
			
			if(mn != -1) {
				lmn = mn, lmx = mx;
			}
		}
		
		return ans;
	}
}

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