Submission #1259025

#	Time	Username	Problem	Language	Result	Execution time	Memory
1259025		shidou26	Triple Jump (JOI19_jumps)	C++17	100 / 100	637 ms	123592 KiB

jumps

#include <bits/stdc++.h>
using namespace std;

#define endl '\n'
#define ff first
#define ss second
#define sz(v) (int)v.size()
#define all(v) v.begin(), v.end()
#define filter(v) v.resize(unique(all(v)) - v.begin())
#define dbg(x) "[" #x " = " << (x) << "]"
 
mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());

template<typename T> bool maximize(T &a, T b) {
    if(a < b) {
        a = b;
        return true; 
    }else return false;
}
template<typename T> bool minimize(T &a, T b) {
    if(a > b) {
        a = b;
        return true;
    }else return false;
}
template<typename T> T rnd(T a, T b) {
    return uniform_int_distribution<T>(a, b)(rng);
}

typedef long long                  ll;
typedef long double                ld;
typedef pair<int, int>             pii;
typedef pair<long long, int>       pli;
typedef pair<long long, long long> pll;

typedef unsigned int uint;

const int N = 5e5 + 3;

int n, q;
uint a[N];
pii queries[N];

namespace subtask_1 {
	bool valid() {
		return n <= 100 && q <= 100;
	}

	void deeto() {
		for(int t = 1; t <= q; t++) {
			int l, r; tie(l, r) = queries[t];

			uint answer = 0;
			for(int i = l; i <= r; i++) {
				for(int j = i + 1; j <= r; j++) {
					for(int k = 2 * j - i; k <= r; k++) {
						maximize(answer, a[i] + a[j] + a[k]);
					}
				}
			}

			cout << answer << endl;
		}
	}
}

namespace subtask_2 {
	bool valid() {
		return n <= 5e3;
	}

	const int N = 5e3 + 3;
	const int LOG = 14;

	uint spt[N][LOG];
	uint dp[N][N];
	
	uint getMax(int l, int r) {
		int b = 31 - __builtin_clz(r - l + 1);
		return max(spt[l][b], spt[r - (1 << b) + 1][b]);
	}

	void deeto() {
		for(int i = 1; i <= n; i++) spt[i][0] = a[i];
		for(int j = 1; j < LOG; j++) for(int i = 1; i + (1 << j) - 1 <= n; i++) 
			spt[i][j] = max(spt[i][j - 1], spt[i + (1 << (j - 1))][j - 1]);

		for(int length = 3; length <= n; length++) {
			for(int i = 1; i + length - 1 <= n; i++) {
				int j = i + length - 1;

				if(length == 3) dp[i][j] = 1LL * a[i] + a[j] + a[i + 1];
				else {
					dp[i][j] = max({
						dp[i + 1][j], 
						dp[i][j - 1], 
						a[i] + a[j] + getMax(i + 1, (i + j) / 2)
					});
				}
			}
		}

		for(int t = 1; t <= q; t++) {
			int l, r; tie(l, r) = queries[t];
			cout << dp[l][r] << endl;
		}

	}
}

namespace subtask_4 {
	bool valid() {
		return true;
	}

	struct Node {
		uint xy, z, best;
		Node (uint xy = 0, uint z = 0, uint best = 0) : xy(xy), z(z), best(best) {}

		friend Node merge(Node a, Node b) {
			return Node(
				max(a.xy, b.xy),
				max(a.z, b.z),
				max({a.best, b.best, a.xy + b.z})
			);
		}
	};

	template<const int N> struct SegmentTree {
		int n;
		Node st[N << 2];
		void init(int _n) {n = _n;}

		void updateXY(int id, int l, int r, int p, uint value) {
			if(l == r) {
				maximize(st[id].xy, value);
				maximize(st[id].best, st[id].xy + st[id].z);
				return void();
			}

			int mid = (l + r) >> 1;
			if(p <= mid) updateXY(id << 1, l, mid, p, value);
			else updateXY(id << 1 | 1, mid + 1, r, p, value);

			st[id] = merge(st[id << 1], st[id << 1 | 1]);
		}

		void updateZ(int id, int l, int r, int p, uint value) {
			if(l == r) {
				st[id].z = value;
				st[id].best = st[id].xy + st[id].z;
				return void();
			}

			int mid = (l + r) >> 1;
			if(p <= mid) updateZ(id << 1, l, mid, p, value);
			else updateZ(id << 1 | 1, mid + 1, r, p, value);

			st[id] = merge(st[id << 1], st[id << 1 | 1]);
		}

		Node get(int id, int l, int r, int u, int v) {
			if(r < u || v < l) return Node();
			if(u <= l && r <= v) return st[id];

			int mid = (l + r) >> 1;
			return merge(get(id << 1, l, mid, u, v), get(id << 1 | 1, mid + 1, r, u, v));
		}
	};

	uint answer[N];
	SegmentTree<N> st;
	vector<pii> candidates[N], ask[N];

	void addCandidate(int x, int y) {
		// cout << x << " " << y << endl;
		if(2 * y - x <= n) 
			candidates[x].emplace_back(2 * y - x, a[x] + a[y]);
	}

	void deeto() {
		stack<uint> stk;
		for(int i = n; i >= 1; i--) {
			while(!stk.empty() && a[stk.top()] < a[i]) {
				addCandidate(i, stk.top());
				stk.pop();
			}

			if(!stk.empty()) addCandidate(i, stk.top());
			stk.push(i);
		}

		for(int i = 1; i <= q; i++) {
			int l, r; tie(l, r) = queries[i];
			ask[l].emplace_back(r, i);
		}

		st.init(n);
		for(int i = n; i >= 1; i--) {
			for(pair<int, uint> it : candidates[i]) 
				st.updateXY(1, 1, n, it.first, it.second);
			st.updateZ(1, 1, n, i, a[i]);

			for(pii it : ask[i]) {
				answer[it.second] = st.get(1, 1, n, i, it.first).best;
			}
		}

		for(int i = 1; i <= q; i++) {
			cout << answer[i] << endl;
		}
	}
}

void process() {
    if(subtask_1::valid()) return subtask_1::deeto();
    if(subtask_2::valid()) return subtask_2::deeto();
    if(subtask_4::valid()) return subtask_4::deeto();
}

void input() {
	cin >> n;

	for(int i = 1; i <= n; i++) {
		cin >> a[i];
	}

	cin >> q;

	for(int i = 1; i <= q; i++) {
		cin >> queries[i].first >> queries[i].second;
	}
}

int main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0);

    #define task "Deeto"
    if(fopen(task".inp", "r")) {
        freopen(task".inp", "r", stdin);
        freopen(task".out", "w", stdout);
    }
    
    int testcase = 1; // cin >> testcase;    
    for(int i = 1; i <= testcase; i++) {
        input();
        process();
    }

    cerr << "Saa, watashtachi no deeto hajimemashou" << endl;
    cerr << "Atarashii kiseki wo koko kara hajimeru shining place nee mou ichido kimi to..." << endl;

    return 0;
}

/*
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*/

Compilation message (stderr)

jumps.cpp: In function 'int main()':
jumps.cpp:241:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  241 |         freopen(task".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
jumps.cpp:242:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  242 |         freopen(task".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 5 / 5
• Subtask 2: 14 / 14
• Subtask 3: 27 / 27
• Subtask 4: 54 / 54