oj.uz

Submission #934542

# Submission time Handle Problem Language Result Execution time Memory
934542 2024-02-27T14:30:29 Z GrindMachine The Big Prize (IOI17_prize) C++17
94.74 / 100
 40 ms 2136 KB 
#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;

template<typename T> using Tree = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
typedef long long int ll;
typedef long double ld;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;

#define fastio ios_base::sync_with_stdio(false); cin.tie(NULL)
#define pb push_back
#define endl '\n'
#define sz(a) a.size()
#define setbits(x) __builtin_popcountll(x)
#define ff first
#define ss second
#define conts continue
#define ceil2(x, y) ((x + y - 1) / (y))
#define all(a) a.begin(), a.end()
#define rall(a) a.rbegin(), a.rend()
#define yes cout << "Yes" << endl
#define no cout << "No" << endl

#define rep(i, n) for(int i = 0; i < n; ++i)
#define rep1(i, n) for(int i = 1; i <= n; ++i)
#define rev(i, s, e) for(int i = s; i >= e; --i)
#define trav(i, a) for(auto &i : a)

template<typename T>
void amin(T &a, T b) {
    a = min(a, b);
}

template<typename T>
void amax(T &a, T b) {
    a = max(a, b);
}

#ifdef LOCAL
#include "debug.h"
#else
#define debug(x) 42
#endif

/*

refs:
edi
https://codeforces.com/blog/entry/53595?#comment-376650

f(i+1) > f(i)^2
#of non-lollipops = O(sqrt(n))

just check all non-lollipops for diamond
efficiently find all non-lollipops

*/

const int MOD = 1e9 + 7;
const int N = 2e5 + 5;
const int inf1 = int(1e9) + 5;
const ll inf2 = ll(1e18) + 5;
const int B = 1e3 + 5;

#include "prize.h"

vector<pii> dp(N,{-1,-1});

pii ask2(int i){
	if(dp[i].ff != -1) return dp[i];
	vector<int> v = ask(i);
	return dp[i] = {v[0],v[1]};
}

int find_best(int n) {
	int mx = -1, pos = -1;

	rep(i,500){
		auto [cl,cr] = ask2(i);
		int cnt = cl+cr;
		if(cnt == 0){
			return i;
		}

		if(cnt > mx){
			mx = cnt;
			pos = i;
		}
	}

	assert(pos != -1);

	deque<int> dq;
	for(int i = pos+B; i < n; i += B){
		dq.pb(i);
	}

	// find the closest non-lollipop with ind > i
	// given that the curr pos is a lollipop
	while(pos < n-1){
		while(!dq.empty() and dq.front() <= pos){
			dq.pop_front();
		}

		auto [fcl,fcr] = ask2(pos);
		int l = pos+1, r = n-1;

		if(!dq.empty()){
			l = dq.back()+1;
			rep(i,sz(dq)){
				auto [cl,cr] = ask2(dq[i]);
				int cnt = cl+cr;
				bool ok = false;

				// mid is not a lollipop
				if(cnt != mx){
					ok = true;
				}
				else{
					// mid is a lollipop
					if(cl > fcl){
						ok = true;
					}
				}

				if(ok){
					if(!i){
						l = pos+1;
					}
					else{
						l = dq[i-1]+1;
					}

					r = dq[i];
					break;
				}
			}	
		}

		int first = -1;

		while(l <= r){
			// is there a lollipop in range [pos,mid]?
			int mid = (l+r) >> 1;
			auto [cl,cr] = ask2(mid);
			int cnt = cl+cr;
			bool ok = false;

			// mid is not a lollipop
			if(cnt != mx){
				ok = true;
			}
			else{
				// mid is a lollipop
				if(cl > fcl){
					ok = true;
				}
			}

			if(ok){
				first = mid;
				r = mid-1;
			}
			else{
				l = mid+1;
			}
		}

		if(first == -1){
			break;
		}

		pos = -1;

		// find the closest pos >= first that is a lollipop
		for(int i = first; i < n; ++i){
			auto [cl,cr] = ask2(i);
			int cnt = cl+cr;
			
			if(cnt == 0){
				return i;
			}

			if(cnt == mx){
				pos = i;
				break;
			}
		}

		if(pos == -1) break;
	}

	// assert(0);
	return -1;
}

Compilation message

prize.cpp: In function 'int find_best(int)':
prize.cpp:28:36: warning: comparison of integer expressions of different signedness: 'int' and 'std::deque<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   28 | #define rep(i, n) for(int i = 0; i < n; ++i)
      |                                    ^
prize.cpp:114:4: note: in expansion of macro 'rep'
  114 |    rep(i,sz(dq)){
      |    ^~~

Subtask #1
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 1880 KB Output is correct
2 Correct 3 ms 1880 KB Output is correct
3 Correct 3 ms 1880 KB Output is correct
4 Correct 5 ms 1880 KB Output is correct
5 Correct 4 ms 1880 KB Output is correct
6 Correct 1 ms 1880 KB Output is correct
7 Correct 3 ms 1880 KB Output is correct
8 Correct 5 ms 1880 KB Output is correct
9 Correct 5 ms 1880 KB Output is correct
10 Correct 4 ms 1880 KB Output is correct

Subtask #2
74.74 / 80.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 1880 KB Output is correct
2 Correct 4 ms 1880 KB Output is correct
3 Correct 4 ms 1880 KB Output is correct
4 Correct 4 ms 1880 KB Output is correct
5 Correct 3 ms 1880 KB Output is correct
6 Correct 1 ms 1880 KB Output is correct
7 Correct 3 ms 1880 KB Output is correct
8 Correct 4 ms 1880 KB Output is correct
9 Correct 3 ms 1880 KB Output is correct
10 Correct 4 ms 1880 KB Output is correct
11 Correct 3 ms 1880 KB Output is correct
12 Correct 3 ms 1880 KB Output is correct
13 Correct 5 ms 1880 KB Output is correct
14 Correct 4 ms 1880 KB Output is correct
15 Correct 5 ms 1880 KB Output is correct
16 Correct 19 ms 1880 KB Output is correct
17 Correct 4 ms 1764 KB Output is correct
18 Partially correct 22 ms 1880 KB Partially correct - number of queries: 5526
19 Correct 3 ms 1880 KB Output is correct
20 Correct 7 ms 1880 KB Output is correct
21 Correct 9 ms 1880 KB Output is correct
22 Correct 4 ms 1876 KB Output is correct
23 Correct 3 ms 1880 KB Output is correct
24 Correct 3 ms 1880 KB Output is correct
25 Correct 12 ms 1880 KB Output is correct
26 Correct 14 ms 1880 KB Output is correct
27 Correct 3 ms 1880 KB Output is correct
28 Partially correct 31 ms 1880 KB Partially correct - number of queries: 5119
29 Correct 23 ms 1880 KB Output is correct
30 Partially correct 21 ms 2076 KB Partially correct - number of queries: 5503
31 Correct 4 ms 1880 KB Output is correct
32 Correct 4 ms 1880 KB Output is correct
33 Correct 1 ms 1880 KB Output is correct
34 Correct 9 ms 1880 KB Output is correct
35 Correct 3 ms 1880 KB Output is correct
36 Correct 9 ms 1880 KB Output is correct
37 Correct 4 ms 1880 KB Output is correct
38 Correct 3 ms 1880 KB Output is correct
39 Correct 11 ms 1880 KB Output is correct
40 Correct 24 ms 1880 KB Output is correct
41 Correct 15 ms 1880 KB Output is correct
42 Correct 13 ms 1880 KB Output is correct
43 Correct 14 ms 1880 KB Output is correct
44 Correct 10 ms 1880 KB Output is correct
45 Correct 8 ms 1880 KB Output is correct
46 Correct 2 ms 1880 KB Output is correct
47 Correct 12 ms 1880 KB Output is correct
48 Correct 19 ms 1880 KB Output is correct
49 Correct 5 ms 1880 KB Output is correct
50 Partially correct 23 ms 1880 KB Partially correct - number of queries: 5502
51 Correct 10 ms 1880 KB Output is correct
52 Correct 3 ms 1880 KB Output is correct
53 Correct 5 ms 1880 KB Output is correct
54 Correct 11 ms 1880 KB Output is correct
55 Correct 3 ms 1880 KB Output is correct
56 Partially correct 26 ms 1880 KB Partially correct - number of queries: 5525
57 Correct 17 ms 1880 KB Output is correct
58 Correct 22 ms 2076 KB Output is correct
59 Correct 17 ms 1880 KB Output is correct
60 Correct 12 ms 1880 KB Output is correct
61 Correct 4 ms 1880 KB Output is correct
62 Correct 3 ms 1880 KB Output is correct
63 Correct 4 ms 1880 KB Output is correct
64 Correct 4 ms 1880 KB Output is correct
65 Correct 3 ms 1880 KB Output is correct
66 Correct 5 ms 1880 KB Output is correct
67 Correct 5 ms 1880 KB Output is correct
68 Correct 3 ms 1880 KB Output is correct
69 Correct 5 ms 1880 KB Output is correct
70 Correct 3 ms 1880 KB Output is correct
71 Partially correct 23 ms 1880 KB Partially correct - number of queries: 5296
72 Correct 5 ms 1880 KB Output is correct
73 Partially correct 27 ms 1880 KB Partially correct - number of queries: 5219
74 Partially correct 19 ms 1880 KB Partially correct - number of queries: 5252
75 Correct 5 ms 1880 KB Output is correct
76 Correct 23 ms 1880 KB Output is correct
77 Partially correct 24 ms 1880 KB Partially correct - number of queries: 5501
78 Correct 5 ms 1880 KB Output is correct
79 Correct 12 ms 1880 KB Output is correct
80 Partially correct 22 ms 1880 KB Partially correct - number of queries: 5492
81 Partially correct 21 ms 1880 KB Partially correct - number of queries: 5501
82 Partially correct 27 ms 1880 KB Partially correct - number of queries: 5412
83 Correct 5 ms 1880 KB Output is correct
84 Correct 18 ms 1880 KB Output is correct
85 Partially correct 40 ms 2132 KB Partially correct - number of queries: 5468
86 Correct 3 ms 2132 KB Output is correct
87 Correct 3 ms 1880 KB Output is correct
88 Correct 4 ms 1880 KB Output is correct
89 Correct 4 ms 1880 KB Output is correct
90 Correct 4 ms 2132 KB Output is correct
91 Correct 3 ms 1880 KB Output is correct
92 Correct 4 ms 1880 KB Output is correct
93 Correct 7 ms 2136 KB Output is correct
94 Correct 6 ms 1880 KB Output is correct
95 Correct 5 ms 1880 KB Output is correct
96 Correct 4 ms 1880 KB Output is correct
97 Correct 3 ms 1880 KB Output is correct