Submission #497373

#	Time	Username	Problem	Language	Result	Execution time	Memory
497373		Ierus	Bigger segments (IZhO19_segments)	C++17	0 / 100	1 ms	332 KiB

segments

#include<bits/stdc++.h>
using namespace std;
#pragma GCC optimize ("unroll-loops,Ofast,O3")
#pragma GCC target("avx,avx2,fma")
#define F first
#define S second
#define int long long
#define sz(x) (int)x.size()
#define pb push_back
#define eb emplace_back
#define all(x) (x).begin(),(x).end()
const int E = 5e5+777;
const long long inf = 1e18+777;
const int N = 3e3+777;
const int MOD = 1e9+7;
int n, a[E], pref[E], dp[E], w[E];
int get(int l, int r){
	if(l == -1 || r == -1) return -inf;
    return pref[r] - pref[l-1];
}
signed main(){
    ios_base::sync_with_stdio(0),
    cin.tie(0),cout.tie(0);
    cin >> n;
    for(int i = 1; i <= n; ++i){
        cin >> a[i];
        pref[i] = pref[i-1] + a[i];
    }
    int ans = 1, last = a[1];
    for(int i = 2; i <= n; ++i){
    	int L = 1, R = n, res = -1;
    	while(L <= R){
    		int M = (L + R) >> 1LL;
    		if(last <= get(i, M)){
    			R = (res = M) - 1;
    		}else L = M + 1;
    	}
    	if(last <= get(i, res)){
    		++ans;
    	}else break;
    	int k = i;
    	for(; k < res; ++k){
    		if(last + k <= get(k+1, res)){
    			last += k;
    		}else break;
    	}
    	last = get(k, res);
    	i = res;
    }
    cout << ans;
}

• Subtask 1: 0 / 13
• Subtask 2: 0 / 14
• Subtask 3: 0 / 10
• Subtask 4: 0 / 36
• Subtask 5: 0 / 27