Submission #392487

#	Time	Username	Problem	Language	Result	Execution time	Memory
392487		bayemirov	Snowball (JOI21_ho_t2)	C++17	0 / 100	61 ms	36440 KiB

Main

#include <bits/stdc++.h>
#define ll long long
#define all(x) x.begin(), x.end()
#define pb push_back
#define pii pair<int, int> 
#define fr first
#define sc second
using namespace std;
const int N = 2e5 + 1;
int n, q;
ll a[N], d[N], p[N], pref[N], pos2[N], qr[N], pos1[N];
int t[N * 4], shift = 1, lg[2 * N], mn[4 * N + 500][20];
vector<ll> all;

int get(ll l, ll r) {
	int k = lg[r - l + 1];
	return min(mn[l][k], mn[r - (1 << k) + 1][k]);
}


bool check(int pos, ll m) {
	cout << "query : " << pos << endl;
	cout << "need : " << m << endl;
	int j = -1;
	ll need = m - a[pos];
	need = lower_bound(all(all), need) - all.begin() + 1;
	j = get(need, N);
	int k = -1;
	need = m - a[pos + 1];
	need = lower_bound(all(all), need) - all.begin();
	k = get(1, need);
	cout << "ans : " << j << " " << k << endl;
	if (j == 1e9) return false;
	if (j > k) return false;
	return true; 
}

bool check2(int pos, ll m) {
	int j = - 1;
	ll need = m - a[pos];
	need = upper_bound(all(all), need) - all.begin();
	j = get(1, need);
	
	int k = -1;
	need = m - a[pos - 1];
	need = upper_bound(all(all), need) - all.begin() + 1;
	k = get(need, N);
	
	if (j == 1e9) return false;
	if (j > k) return false;
	return true; 
}


int main() {
	ios_base::sync_with_stdio(0);
	cin.tie(0); cout.tie(0);
	cin >> n >> q;
	
	for (int i = 0; i < 4 * N; i++) t[i] = 1e9;
	for (int i = 1; i <= n; i++) cin >> a[i];
	
	ll x = *min_element(a + 1, a + 1 + n);
	ll mn2 = 1e18;
	
	for (int i = 1; i <= q; i++) cin >> d[i];
	for (int i = 1; i <= q; i++) p[i] = p[i - 1] + d[i], all.pb(p[i]);
	for (int i = 1; i <= q; i++) mn2 = min(mn2, x + p[i]);
	for (int i = 1; i <= n; i++) a[i] += abs(mn2) + 1;
	
	sort(all(all));
	all.resize(unique(all(all)) - all.begin());
	
	for (int i = 1; i <= q; i++) pref[i] = lower_bound(all(all), p[i]) - all.begin() + 1;
	
	for (int i = 1; i <= q; i++) t[pref[i]] = min(t[pref[i]], i);
	
	for (int i = 0; i <= 2 * N; i++) { 
		for (int j = 0; j < 20; j++) mn[i][j] = 1e9;
		mn[i][0] = t[i];
	}
	
	for (int i = 2; i <= 2 * N; i++) lg[i] = lg[i / 2] + 1;
	
	for (int i = 1; i < 20; i++) 
		for (int j = 1; j <= N; j++) 
			mn[j][i] = min(mn[j][i - 1], mn[j + (1 << (i - 1))][i - 1]);
		
	for (int i = 1; i < n; i++) {
		ll l = a[i] + 1;
		ll r = a[i + 1];
		ll ans = -1;
		while (l <= r) {
			ll m = (l + r) / 2;
			if (check(i, m)) l = m + 1, ans = m;
			else r = m - 1;
		}
		cout << "right " << i << " " << ans << endl;
		pos1[i] = ans;
	}
	for (int i = 2; i <= n; i++) {
		ll l = a[i - 1];
		ll r = a[i] - 1;
		ll ans = -1;
		while (l <= r) {
			ll m = (l + r) / 2;
			if (check2(i, m)) r = m - 1, ans = m;
			else l = m + 1;
		}
		pos2[i] = ans;
	}
	
	for (int i = 1; i < n; i++) if (pos1[i] != -1) qr[i] += pos1[i] - a[i];
	for (int i = 2; i <= n; i++) if (pos2[i] != -1) qr[i] += a[i] - pos2[i];
	
	qr[1] += abs(min(0ll, *min_element(p + 1, p + 1 + q)));
	qr[n] += max(0ll, *max_element(p + 1, p + 1 + q));
	for (int i = 1; i <= n; i++) cout << qr[i] << endl; 	
	return 0;
}

Compilation message (stderr)

Main.cpp: In function 'int main()':
Main.cpp:83:41: warning: iteration 400000 invokes undefined behavior [-Waggressive-loop-optimizations]
   83 |  for (int i = 2; i <= 2 * N; i++) lg[i] = lg[i / 2] + 1;
      |                                   ~~~~~~^~~~~~~~~~~~~~~
Main.cpp:83:20: note: within this loop
   83 |  for (int i = 2; i <= 2 * N; i++) lg[i] = lg[i / 2] + 1;
      |                  ~~^~~~~~~~

• Subtask 1: 0 / 33
• Subtask 2: 0 / 67