제출 #894332

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
894332		vjudge1	Bigger segments (IZhO19_segments)	C++17	100 / 100	60 ms	21076 KiB

segments

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace std;
using namespace __gnu_pbds;

//#pragma GCC optimization("g", on)
//#pragma GCC optimization("03")
//#pragma comment(linker, "/stack:200000000")
//#pragma GCC optimize("Ofast")
//#pragma GCC optimize("inline")
//#pragma GCC optimize("-fgcse,-fgcse-lm")
//#pragma GCC optimize("-ftree-pre,-ftree-vrp")
//#pragma GCC optimize("-ffast-math")
//#pragma GCC optimize("-fipa-sra")
//#pragma GCC optimize("-fpeephole2")
//#pragma GCC optimize("-fsched-spec")
//#pragma GCC optimize("Ofast,no-stack-protector")
//#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,avx2,tune=native")
//#pragma GCC optimize("unroll-loops")

#define aboba ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL);
#define br break;
#define sp " "
#define en "\n"
#define pb push_back
#define sz size()
#define bg begin()
#define ed end()
#define in insert
#define ss second
#define ff first
#define setp(a) cout << fixed; cout << setprecision(a);
#define all(v) v.begin(), v.end()
 
typedef long long ll;
typedef long double ld;
typedef pair<ll, ll> pll;
typedef double db;
typedef tree<
    long long,
    null_type,
    less_equal<long long>,
    rb_tree_tag,
    tree_order_statistics_node_update> orset;

void freopen(string s) { freopen((s + ".in").c_str(), "r", stdin); freopen((s + ".out").c_str(), "w", stdout); }
ll bp(ll x, ll y, ll z) { ll res = 1; while (y) { if (y & 1) { res = (res * x) % z; y--; } x = (x * x) % z; y >>= 1; } return res; }
// C(n, k) = ((fact[n] * bp(fact[k], mod - 2)) % mod * bp(fact[n - k], mod - 2)) % mod;
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
ll lcm(ll a, ll b) { return (a / __gcd(a, b)) * b; }

const ll N = 5e5 + 11;
const ll inf = 1e18 + 7;
ll tt = 1;
ll a[N];
pll dp[N];
ll cnt[5005];
ll p[N];

void solve() {
	ll n; cin >> n;
	for (int i = 1;i <= n;i++) cin >> a[i], p[i] = p[i - 1] + a[i];
	dp[1] = {1, -a[1]};
	for (int i = 1;i <= n;i++) {
		dp[i] = max(dp[i], {dp[i - 1].ff, dp[i - 1].ss - a[i]});
//		cout << dp[i].ff << sp << dp[i].ss << en;
		ll l = i + 1, r = n, pos = 0;
		while (l <= r) {
			ll m = (l + r) / 2;
			if (p[m] - p[i] >= -dp[i].ss) {
				r = m - 1;
				pos = m;
			} else l = m + 1;
		}
		if (pos == 0) continue;
		dp[pos] = max(dp[pos], {dp[i].ff + 1, -(p[pos] - p[i])});
	}
	cout << dp[n].ff << en;
}

int main() {      
    aboba    
//    freopen("cownomics");
//    precalc();
//    cin >> tt;
    for (int i = 1;i <= tt;i++) {
		solve();
    }
}

컴파일 시 표준 에러 (stderr) 메시지

segments.cpp: In function 'void freopen(std::string)':
segments.cpp:47:33: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   47 | void freopen(string s) { freopen((s + ".in").c_str(), "r", stdin); freopen((s + ".out").c_str(), "w", stdout); }
      |                          ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
segments.cpp:47:75: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   47 | void freopen(string s) { freopen((s + ".in").c_str(), "r", stdin); freopen((s + ".out").c_str(), "w", stdout); }
      |                                                                    ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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