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Submission #1048770

# Submission time Handle Problem Language Result Execution time Memory
1048770 2024-08-08T09:29:15 Z pcc The Big Prize (IOI17_prize) C++17
99 / 100
 114 ms 3440 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(77771449);
#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 5 ms 3024 KB Output is correct
2 Correct 6 ms 3020 KB Output is correct
3 Correct 6 ms 3024 KB Output is correct
4 Correct 6 ms 3024 KB Output is correct
5 Correct 7 ms 3024 KB Output is correct
6 Correct 5 ms 3024 KB Output is correct
7 Correct 5 ms 3024 KB Output is correct
8 Correct 5 ms 3024 KB Output is correct
9 Correct 5 ms 3020 KB Output is correct
10 Correct 6 ms 3024 KB Output is correct

Subtask #2
79.0 / 80.0

# Verdict Execution time Memory Grader output
1 Correct 10 ms 3024 KB Output is correct
2 Correct 7 ms 3024 KB Output is correct
3 Correct 9 ms 3024 KB Output is correct
4 Correct 5 ms 3024 KB Output is correct
5 Correct 6 ms 3124 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 5 ms 3024 KB Output is correct
10 Correct 7 ms 3024 KB Output is correct
11 Correct 11 ms 3024 KB Output is correct
12 Correct 19 ms 3192 KB Output is correct
13 Correct 10 ms 3024 KB Output is correct
14 Correct 8 ms 2136 KB Output is correct
15 Correct 14 ms 3028 KB Output is correct
16 Correct 50 ms 3232 KB Output is correct
17 Correct 64 ms 3440 KB Output is correct
18 Correct 44 ms 3024 KB Output is correct
19 Correct 52 ms 3024 KB Output is correct
20 Correct 26 ms 2516 KB Output is correct
21 Correct 54 ms 3204 KB Output is correct
22 Correct 41 ms 3024 KB Output is correct
23 Correct 7 ms 3024 KB Output is correct
24 Correct 16 ms 3024 KB Output is correct
25 Correct 83 ms 3024 KB Output is correct
26 Correct 58 ms 3184 KB Output is correct
27 Correct 9 ms 3024 KB Output is correct
28 Correct 24 ms 3180 KB Output is correct
29 Correct 48 ms 3024 KB Output is correct
30 Correct 26 ms 3024 KB Output is correct
31 Correct 33 ms 3024 KB Output is correct
32 Correct 11 ms 3024 KB Output is correct
33 Correct 1 ms 1876 KB Output is correct
34 Correct 63 ms 3196 KB Output is correct
35 Correct 9 ms 3120 KB Output is correct
36 Correct 92 ms 3252 KB Output is correct
37 Correct 8 ms 3024 KB Output is correct
38 Correct 8 ms 3116 KB Output is correct
39 Correct 27 ms 3116 KB Output is correct
40 Correct 55 ms 3256 KB Output is correct
41 Correct 86 ms 3260 KB Output is correct
42 Correct 91 ms 3244 KB Output is correct
43 Correct 74 ms 3284 KB Output is correct
44 Correct 57 ms 3024 KB Output is correct
45 Correct 54 ms 3024 KB Output is correct
46 Correct 71 ms 3044 KB Output is correct
47 Correct 60 ms 3024 KB Output is correct
48 Correct 58 ms 3204 KB Output is correct
49 Correct 92 ms 3272 KB Output is correct
50 Correct 88 ms 3268 KB Output is correct
51 Correct 66 ms 3024 KB Output is correct
52 Correct 57 ms 3180 KB Output is correct
53 Correct 7 ms 3164 KB Output is correct
54 Correct 25 ms 3024 KB Output is correct
55 Correct 72 ms 3100 KB Output is correct
56 Correct 73 ms 3260 KB Output is correct
57 Correct 51 ms 3024 KB Output is correct
58 Correct 78 ms 3120 KB Output is correct
59 Correct 108 ms 3184 KB Output is correct
60 Correct 33 ms 3116 KB Output is correct
61 Correct 6 ms 3116 KB Output is correct
62 Correct 10 ms 3104 KB Output is correct
63 Correct 7 ms 3112 KB Output is correct
64 Correct 9 ms 3096 KB Output is correct
65 Correct 6 ms 2992 KB Output is correct
66 Correct 7 ms 3116 KB Output is correct
67 Correct 7 ms 3112 KB Output is correct
68 Correct 8 ms 3096 KB Output is correct
69 Correct 5 ms 3116 KB Output is correct
70 Correct 7 ms 3116 KB Output is correct
71 Partially correct 114 ms 3192 KB Partially correct - number of queries: 5100
72 Correct 19 ms 3024 KB Output is correct
73 Correct 83 ms 3320 KB Output is correct
74 Correct 76 ms 3024 KB Output is correct
75 Correct 7 ms 3024 KB Output is correct
76 Correct 76 ms 3072 KB Output is correct
77 Correct 70 ms 3236 KB Output is correct
78 Correct 17 ms 3024 KB Output is correct
79 Correct 40 ms 3024 KB Output is correct
80 Correct 86 ms 3024 KB Output is correct
81 Correct 73 ms 3024 KB Output is correct
82 Correct 62 ms 3020 KB Output is correct
83 Correct 7 ms 3020 KB Output is correct
84 Correct 42 ms 3024 KB Output is correct
85 Correct 90 ms 3024 KB Output is correct
86 Correct 31 ms 3280 KB Output is correct
87 Correct 11 ms 3024 KB Output is correct
88 Correct 44 ms 3024 KB Output is correct
89 Correct 12 ms 3192 KB Output is correct
90 Correct 7 ms 3024 KB Output is correct
91 Correct 12 ms 3024 KB Output is correct
92 Correct 8 ms 3024 KB Output is correct
93 Correct 80 ms 3220 KB Output is correct
94 Correct 78 ms 3264 KB Output is correct
95 Correct 95 ms 3280 KB Output is correct
96 Correct 39 ms 3024 KB Output is correct
97 Correct 14 ms 3024 KB Output is correct