oj.uz

Submission #731868

# Submission time Handle Problem Language Result Execution time Memory
731868 2023-04-28T06:11:37 Z sentheta The Big Prize (IOI17_prize) C++17
97.67 / 100
 55 ms 5200 KB 
#include "prize.h"
// author : sentheta aka vanwij
#include<iostream>
#include<iomanip>
#include<algorithm>
#include<cassert>
#include<random>
#include<chrono>
#include<cmath>
#include<string>
#include<vector>
#include<bitset>
#include<queue>
#include<stack>
#include<map>
#include<set>
using namespace std;

#define Int long long
#define V vector
#define pii pair<int,int>
#define ff first
#define ss second

mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());

#define pow2(x) (1LL<<(x))
#define msb(x) (63-__builtin_clzll(x))
#define bitcnt(x) (__builtin_popcountll(x))

#define nl '\n'
#define _ << ' ' <<
#define all(x) (x).begin(), (x).end()
#define rep(i,a,b) for(int i = (int)(a); i < (int)(b); i++)
#define dbg(x) if(1) cout << "?" << #x << " : " << (x) << endl << flush;


const int N = 2e5+5;
V<int> memo[N];
pii query(int i){
	if(memo[i].empty()) memo[i] = ask(i);
	return {memo[i][0], memo[i][1]};
}

int n;

#define mid (tl+tr)/2
#define lc (v+1)
#define rc (v+2*(mid-tl+1))
struct Segtree{
	int cnt[2*N];
	void upd(int i,int v=0,int tl=0,int tr=n-1){
		if(tl==tr){
			cnt[v] = 1; return;
		}
		if(i<=mid) upd(i, lc,tl,mid);
		else upd(i, rc,mid+1,tr);
		cnt[v] = cnt[lc] + cnt[rc];
	}
	int qry(int l,int r,int v=0,int tl=0,int tr=n-1){
		if(r<tl || tr<l) return 0;
		if(l<=tl && tr<=r) return cnt[v];
		return qry(l,r, lc,tl,mid) + qry(l,r, rc,mid+1,tr);
	}
} segtree;
#undef mid



int mx = 0;
int dnc(int lout=0,int rout=0,int l=0,int r=n-1){
	if(l > r) return -1;
	if(lout+rout+segtree.qry(l,r) == mx){
		// assert(0);
		return -1;
	}

	int midcnt = 0;
	for(int m=(l+r)/2; m<=r; m++){
		auto[lcnt,rcnt] = query(m);
		if(lcnt+rcnt==0) return m;
		if(lcnt+rcnt < mx){
			midcnt++; continue;
		}

		if(lcnt > lout+midcnt){
			int i = dnc(lout,midcnt+rcnt, l,(l+r)/2-1);
			if(i!=-1) return i;
		}
		if(rcnt > rout){
			int i = dnc(lcnt,rout, m+1,r);
			if(i!=-1) return i;
		}
		return -1;
	}

	for(int m=(l+r)/2-1; m>=l; m--){
		auto[lcnt,rcnt] = query(m);
		if(lcnt+rcnt==0) return m;
		if(lcnt+rcnt < mx){
			midcnt++; continue;
		}
		// assert(rcnt == midcnt + rout);

		if(lcnt > lout){
			int i = dnc(lout,rcnt, l,m-1);
			if(i!=-1) return i;
		}
		return -1;
	}

	return -1;
}


int find_best(int _n){
	n = _n;

	V<int> ord;
	for(int i=0; i<min(n,237); i++){
		ord.push_back(i);
	}
	for(int i=n-1; i>=max(n-237,0); i--){
		ord.push_back(i);
	}
	rep(i,0,ord.size()){
		swap(ord[i], ord[rng()%(i+1)]);
	}


	map<int,V<int>> mp;
	for(int j=0; j<ord.size(); j++){
		int i = ord[j];
	// for(int i=max(0,n/2-240); i<=min(n-1,n/2+240); i++){
	// rep(i,0,474){
		auto[lcnt,rcnt] = query(i);
		if(lcnt+rcnt==0) return i;

		mp[lcnt+rcnt].push_back(i);
		mx = max(mx, lcnt+rcnt);
		// if(mp.size()==4) break;
		// if(lcnt+rcnt>500) break;
	}
	assert((int)mp.size()<=4);

	for(auto&[x,v] : mp){
		if(x==mx){

		}
		else{
			for(int i : v){
				segtree.upd(i);
			}
		}
	}

	int ans = dnc();
	return ans;
}

Compilation message

prize.cpp: In function 'int find_best(int)':
prize.cpp:132:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  132 |  for(int j=0; j<ord.size(); j++){
      |               ~^~~~~~~~~~~

Subtask #1
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 5020 KB Output is correct
2 Correct 6 ms 5016 KB Output is correct
3 Correct 6 ms 4996 KB Output is correct
4 Correct 3 ms 5008 KB Output is correct
5 Correct 6 ms 4992 KB Output is correct
6 Correct 6 ms 5012 KB Output is correct
7 Correct 6 ms 4944 KB Output is correct
8 Correct 6 ms 4944 KB Output is correct
9 Correct 7 ms 5020 KB Output is correct
10 Correct 6 ms 4944 KB Output is correct

Subtask #2
77.67 / 80.0

# Verdict Execution time Memory Grader output
1 Correct 8 ms 4992 KB Output is correct
2 Correct 7 ms 4944 KB Output is correct
3 Correct 5 ms 5096 KB Output is correct
4 Correct 6 ms 4944 KB Output is correct
5 Correct 7 ms 4996 KB Output is correct
6 Correct 3 ms 4944 KB Output is correct
7 Correct 5 ms 5016 KB Output is correct
8 Correct 9 ms 4988 KB Output is correct
9 Correct 7 ms 4944 KB Output is correct
10 Correct 7 ms 4944 KB Output is correct
11 Correct 6 ms 5020 KB Output is correct
12 Correct 7 ms 4992 KB Output is correct
13 Correct 17 ms 5020 KB Output is correct
14 Correct 8 ms 5024 KB Output is correct
15 Correct 9 ms 5008 KB Output is correct
16 Correct 40 ms 5108 KB Output is correct
17 Correct 7 ms 4988 KB Output is correct
18 Correct 24 ms 5152 KB Output is correct
19 Correct 8 ms 4988 KB Output is correct
20 Correct 17 ms 5028 KB Output is correct
21 Correct 21 ms 4944 KB Output is correct
22 Correct 8 ms 5012 KB Output is correct
23 Correct 7 ms 4984 KB Output is correct
24 Correct 7 ms 4944 KB Output is correct
25 Correct 29 ms 5120 KB Output is correct
26 Correct 31 ms 5064 KB Output is correct
27 Correct 8 ms 4944 KB Output is correct
28 Correct 40 ms 5120 KB Output is correct
29 Correct 17 ms 5124 KB Output is correct
30 Correct 55 ms 5192 KB Output is correct
31 Correct 5 ms 4944 KB Output is correct
32 Correct 10 ms 4996 KB Output is correct
33 Correct 3 ms 4944 KB Output is correct
34 Correct 12 ms 5136 KB Output is correct
35 Correct 9 ms 4988 KB Output is correct
36 Correct 9 ms 5040 KB Output is correct
37 Correct 9 ms 4944 KB Output is correct
38 Correct 7 ms 4944 KB Output is correct
39 Correct 29 ms 5044 KB Output is correct
40 Correct 45 ms 5124 KB Output is correct
41 Correct 26 ms 5184 KB Output is correct
42 Correct 32 ms 5064 KB Output is correct
43 Correct 26 ms 5012 KB Output is correct
44 Correct 20 ms 4988 KB Output is correct
45 Correct 24 ms 5068 KB Output is correct
46 Correct 5 ms 5000 KB Output is correct
47 Correct 23 ms 5164 KB Output is correct
48 Correct 42 ms 5200 KB Output is correct
49 Correct 9 ms 5124 KB Output is correct
50 Correct 48 ms 5140 KB Output is correct
51 Correct 22 ms 4992 KB Output is correct
52 Correct 6 ms 5016 KB Output is correct
53 Correct 6 ms 4984 KB Output is correct
54 Correct 23 ms 5160 KB Output is correct
55 Correct 8 ms 4992 KB Output is correct
56 Correct 47 ms 5140 KB Output is correct
57 Correct 32 ms 5076 KB Output is correct
58 Correct 18 ms 5100 KB Output is correct
59 Correct 22 ms 5064 KB Output is correct
60 Correct 32 ms 4992 KB Output is correct
61 Correct 9 ms 5012 KB Output is correct
62 Correct 7 ms 5064 KB Output is correct
63 Correct 6 ms 5012 KB Output is correct
64 Correct 7 ms 5016 KB Output is correct
65 Correct 5 ms 4988 KB Output is correct
66 Correct 5 ms 4992 KB Output is correct
67 Correct 9 ms 5004 KB Output is correct
68 Correct 6 ms 5092 KB Output is correct
69 Correct 4 ms 4988 KB Output is correct
70 Correct 8 ms 4996 KB Output is correct
71 Partially correct 52 ms 5068 KB Partially correct - number of queries: 5233
72 Correct 9 ms 5028 KB Output is correct
73 Partially correct 55 ms 5072 KB Partially correct - number of queries: 5170
74 Partially correct 40 ms 5048 KB Partially correct - number of queries: 5197
75 Correct 9 ms 4944 KB Output is correct
76 Correct 32 ms 5128 KB Output is correct
77 Correct 53 ms 5036 KB Output is correct
78 Correct 10 ms 4944 KB Output is correct
79 Correct 31 ms 5032 KB Output is correct
80 Correct 55 ms 5032 KB Output is correct
81 Correct 54 ms 5016 KB Output is correct
82 Correct 41 ms 5136 KB Output is correct
83 Correct 11 ms 5008 KB Output is correct
84 Correct 38 ms 5028 KB Output is correct
85 Correct 40 ms 5064 KB Output is correct
86 Correct 13 ms 5020 KB Output is correct
87 Correct 11 ms 5020 KB Output is correct
88 Correct 14 ms 4944 KB Output is correct
89 Correct 12 ms 5032 KB Output is correct
90 Correct 6 ms 4944 KB Output is correct
91 Correct 10 ms 5060 KB Output is correct
92 Correct 8 ms 5008 KB Output is correct
93 Correct 10 ms 5056 KB Output is correct
94 Correct 8 ms 4944 KB Output is correct
95 Correct 13 ms 5156 KB Output is correct
96 Correct 10 ms 5020 KB Output is correct
97 Correct 8 ms 4944 KB Output is correct