Submission #526530

#	Time	Username	Problem	Language	Result	Execution time	Memory
526530		Bill_00	Bigger segments (IZhO19_segments)	C++14	100 / 100	192 ms	25224 KiB

segments

#include <bits/stdc++.h>
#define MOD 1000000007
#define ff first
#define ss second
#define N 500005
typedef long long ll;
const ll mx = 1e9 + 100005;
using namespace std;
ll a[N], M[N], H[N], sum[N], mn[4 * N];

ll solve(ll id, ll l, ll r, ll val){
	ll m = l + r >> 1;
	if(l == r) return l;
	if(mn[id * 2 + 1] <= val) return solve(id * 2 + 1, m + 1, r, val);
	else return solve(id * 2, l, m, val);
}

void update(ll id, ll l, ll r, ll pos, ll val){
	if(l == r){
		mn[id] = val;
		return;
	}
	ll m = l + r >> 1;
	if(m >= pos) update(id * 2, l, m, pos, val);
	else update(id * 2 + 1, m + 1, r, pos, val);
	mn[id] = min(mn[id * 2], mn[id * 2 + 1]);
}
int main() {
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	cout.tie(0);
	ll n;
	cin >> n;
	for(ll i = 0; i <= n; i++){
		update(1, 0, n, i, 1e18);
	}
	for(ll i = 1; i <= n; i++){
		cin >> a[i];
		sum[i] = sum[i - 1] + a[i];
		ll id = solve(1, 0, n, sum[i]);
		H[i] = H[id] + 1;
		update(1, 0, n, i, sum[i] - sum[id] + sum[i]);

	}
	cout << H[n];
}

Compilation message (stderr)

segments.cpp: In function 'll solve(ll, ll, ll, ll)':
segments.cpp:12:11: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   12 |  ll m = l + r >> 1;
      |         ~~^~~
segments.cpp: In function 'void update(ll, ll, ll, ll, ll)':
segments.cpp:23:11: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   23 |  ll m = l + r >> 1;
      |         ~~^~~

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