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Submission #1048687

# Submission time Handle Problem Language Result Execution time Memory
1048687 2024-08-08T09:05:32 Z pcc The Big Prize (IOI17_prize) C++17
98.23 / 100
 122 ms 3784 KB 
#include "prize.h"
#include <bits/stdc++.h>
#include <bits/extc++.h>
using namespace __gnu_pbds;
using namespace std;

template <typename T>
using ordered_set = tree<T,null_type,less<T>,rb_tree_tag,tree_order_statistics_node_update>;
#define pii pair<int,int>
#define fs first
#define sc second
mt19937 seed(time(NULL));
#define rnd(l,r) uniform_int_distribution<int>(l,r)(seed)

#ifdef LOCAL
const int lim = 3;
const int dt = 5;
#else
const int lim = 5000;
const int dt = 460;
#endif

const int mxn = 2e5+10;
pii dp[mxn];
int N;
int big = 1e9;
int ans = 0;
bool done = false;
int C = 0;
ordered_set<int> st;
pii rng;

pii req(int p){
	if(dp[p].fs != -1)return dp[p];
	C++;
	assert(C<=10000);
	auto re = ask(p);
	return (dp[p] = pii(re[0],re[1]));
}

int check(int p){
	auto re = req(p);
	if(!re.fs&&!re.sc)return 0;
	else if(N-re.fs-re.sc == big)return 2;
	else if(re.fs+re.sc == 1){
		if(re.fs == 1)rng.sc = p-1;
		else rng.fs = p+1;
		return 1;
	}
	else{
		st.insert(p);
		return 1;
	}
}

deque<pii> q;

void calc(){
	if(done)return;
	int l,r;
	if(rnd(0,1)){
		auto [a,b] = q.front();q.pop_front();
		l = a,r = b;
	}
	else{
		auto [a,b] = q.back();q.pop_back();
		l = a,r = b;
	}
	l = max(l,rng.fs);r = min(r,rng.sc);
	cerr<<"DFS: "<<l<<','<<r<<endl;
	while(l<=r){
		if(!check(l)){
			ans = l;
			done = true;
			return;
		}
		else if(check(l) == 1){
			l++;
		}
		else break;
	}
	while(l<=r){
		if(!check(r)){
			ans = r;
			done = true;
			return;
		}
		else if(check(r) == 1){
			r--;
		}
		else break;
	}
	if(l>=r)return;
	int cnt = req(r).fs+req(l).sc-(N-big);
	if(!cnt)return;
	cerr<<"CHECK: "<<l<<','<<r<<','<<cnt<<endl;
	assert(cnt>0);
	int mid = (l+r+1)>>1;
	if(check(mid) == 0){
		ans = mid;
		done = true;
		return;
	}
	if(l == r)return;
	if(l != mid)q.push_back(pii(l,mid));
	if(mid != r)q.push_back(pii(mid,r));
	return;
}

int find_best(int nn) {
	N = nn;
	int pt = 0;
	for(int i = 1;i*i<2e5;i++)pt = i;
	cerr<<pt<<endl;
	for(auto &i:dp)i = pii(-1,-1);
	if(N<=lim){
		for(int i = 0;i<N;i++){
			auto tmp = req(i);
			if(!tmp.fs&&!tmp.sc)return i;
		}
		assert(false);
		return 0;
	}
	vector<int> perm;
	for(int i = 0;i<N;i++)perm.push_back(i);
	shuffle(perm.begin(),perm.end(),seed);
	for(int i = 0;i<dt;i++){
		auto tmp = req(perm[i]);
		big = min(big,N-tmp.fs-tmp.sc);
		if(!tmp.fs&&!tmp.sc){
			return perm[i];
		}
	}
	cerr<<"BIG: "<<big<<endl;
	q.push_back(pii(0,N-1));
	rng = pii(0,N-1);
	while(!q.empty()&&!done)calc();
	if(!done)exit(0);
	return ans;
}

Subtask #1
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 3024 KB Output is correct
2 Correct 5 ms 3120 KB Output is correct
3 Correct 5 ms 3024 KB Output is correct
4 Correct 5 ms 3124 KB Output is correct
5 Correct 8 ms 3024 KB Output is correct
6 Correct 5 ms 3024 KB Output is correct
7 Correct 6 ms 3024 KB Output is correct
8 Correct 5 ms 3024 KB Output is correct
9 Correct 6 ms 3020 KB Output is correct
10 Correct 6 ms 3024 KB Output is correct

Subtask #2
78.23 / 80.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 3024 KB Output is correct
2 Correct 5 ms 3024 KB Output is correct
3 Correct 5 ms 3024 KB Output is correct
4 Correct 5 ms 3024 KB Output is correct
5 Correct 5 ms 3276 KB Output is correct
6 Correct 5 ms 3024 KB Output is correct
7 Correct 5 ms 3020 KB Output is correct
8 Correct 5 ms 3024 KB Output is correct
9 Correct 9 ms 3024 KB Output is correct
10 Correct 9 ms 3024 KB Output is correct
11 Correct 21 ms 3024 KB Output is correct
12 Correct 14 ms 3024 KB Output is correct
13 Correct 21 ms 3024 KB Output is correct
14 Correct 7 ms 2136 KB Output is correct
15 Correct 16 ms 3024 KB Output is correct
16 Correct 64 ms 3268 KB Output is correct
17 Correct 81 ms 3328 KB Output is correct
18 Correct 54 ms 3212 KB Output is correct
19 Correct 74 ms 3024 KB Output is correct
20 Correct 56 ms 2856 KB Output is correct
21 Correct 51 ms 3268 KB Output is correct
22 Correct 53 ms 3024 KB Output is correct
23 Correct 9 ms 3024 KB Output is correct
24 Correct 11 ms 3024 KB Output is correct
25 Correct 53 ms 3024 KB Output is correct
26 Correct 67 ms 3164 KB Output is correct
27 Correct 7 ms 3024 KB Output is correct
28 Correct 21 ms 3024 KB Output is correct
29 Correct 37 ms 3024 KB Output is correct
30 Correct 6 ms 3024 KB Output is correct
31 Correct 36 ms 3024 KB Output is correct
32 Correct 12 ms 3196 KB Output is correct
33 Correct 1 ms 1880 KB Output is correct
34 Correct 37 ms 3116 KB Output is correct
35 Correct 8 ms 3024 KB Output is correct
36 Correct 81 ms 3036 KB Output is correct
37 Correct 12 ms 3024 KB Output is correct
38 Correct 7 ms 3024 KB Output is correct
39 Correct 68 ms 3276 KB Output is correct
40 Correct 24 ms 3024 KB Output is correct
41 Correct 71 ms 3024 KB Output is correct
42 Correct 61 ms 3028 KB Output is correct
43 Correct 53 ms 3024 KB Output is correct
44 Correct 44 ms 3024 KB Output is correct
45 Correct 28 ms 3024 KB Output is correct
46 Correct 73 ms 3196 KB Output is correct
47 Correct 62 ms 3024 KB Output is correct
48 Correct 35 ms 3024 KB Output is correct
49 Correct 48 ms 3024 KB Output is correct
50 Correct 54 ms 3024 KB Output is correct
51 Correct 54 ms 3024 KB Output is correct
52 Correct 23 ms 3024 KB Output is correct
53 Correct 12 ms 3024 KB Output is correct
54 Correct 24 ms 3024 KB Output is correct
55 Correct 51 ms 3020 KB Output is correct
56 Correct 72 ms 3024 KB Output is correct
57 Correct 80 ms 3024 KB Output is correct
58 Correct 81 ms 3024 KB Output is correct
59 Correct 70 ms 3292 KB Output is correct
60 Correct 58 ms 3024 KB Output is correct
61 Correct 6 ms 3024 KB Output is correct
62 Correct 7 ms 3024 KB Output is correct
63 Correct 9 ms 3784 KB Output is correct
64 Correct 7 ms 3024 KB Output is correct
65 Correct 5 ms 3024 KB Output is correct
66 Correct 5 ms 3024 KB Output is correct
67 Correct 6 ms 3024 KB Output is correct
68 Correct 8 ms 3024 KB Output is correct
69 Correct 5 ms 3024 KB Output is correct
70 Correct 6 ms 3024 KB Output is correct
71 Partially correct 122 ms 3268 KB Partially correct - number of queries: 5177
72 Correct 15 ms 3024 KB Output is correct
73 Partially correct 120 ms 3212 KB Partially correct - number of queries: 5113
74 Correct 92 ms 3024 KB Output is correct
75 Correct 7 ms 3024 KB Output is correct
76 Correct 92 ms 3024 KB Output is correct
77 Correct 43 ms 3024 KB Output is correct
78 Correct 18 ms 3024 KB Output is correct
79 Correct 43 ms 3024 KB Output is correct
80 Correct 59 ms 3024 KB Output is correct
81 Correct 76 ms 3024 KB Output is correct
82 Correct 71 ms 3444 KB Output is correct
83 Correct 7 ms 3024 KB Output is correct
84 Correct 68 ms 3024 KB Output is correct
85 Correct 81 ms 3476 KB Output is correct
86 Correct 10 ms 3024 KB Output is correct
87 Correct 14 ms 3024 KB Output is correct
88 Correct 17 ms 3024 KB Output is correct
89 Correct 11 ms 3024 KB Output is correct
90 Correct 9 ms 3024 KB Output is correct
91 Correct 27 ms 3024 KB Output is correct
92 Correct 7 ms 3024 KB Output is correct
93 Correct 69 ms 3024 KB Output is correct
94 Correct 65 ms 3024 KB Output is correct
95 Correct 83 ms 3168 KB Output is correct
96 Correct 43 ms 3024 KB Output is correct
97 Correct 13 ms 3024 KB Output is correct