oj.uz

Submission #781139

# Submission time Handle Problem Language Result Execution time Memory
781139 2023-07-12T19:03:16 Z TimDee The Big Prize (IOI17_prize) C++17
100 / 100
 204 ms 2372 KB 
#include "prize.h"
#include <bits/stdc++.h>
using namespace std;
#define forn(i,n) for(int i=0;i<n;++i)
#define pb push_back
#define pi pair<int,int>
#define f first
#define s second
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
int rand(int a, int b) {return a+rng()%(b-a+1);}
#define all(x) x.begin(),x.end()

map<int,vector<int>> mem;
vector<int> query(int i) {
	if (mem.count(i)) return mem[i];
	mem[i]=ask(i);
	return mem[i];
} 

struct BIT {
	vector<int> t; int n;
	BIT(int n) {
		this->n = n;
		t.assign(n,0);
	}
	void add(int i, int x) {
		for(;i<n;i=i|(i+1)) t[i]+=x;
	}
	int sum(int r) {
		int q=0; for(;r>=0;r=(r&(r+1))-1) q+=t[r]; return q;
	}
};

int find_best(int n) {
	BIT ft(n);
	int f=-1;
	map<int,int> was;
	vector<pi> z;
	
	const int T=1<<8;
	vector<int> p; forn(i,n) p.pb(i);
	
	vector<int> t;

	vector<int> zzz;
	for (int l=0; l<n; l+=T) {
		int r=l+T-1; r=min(r,n-1);
		vector<int> z;
		for(auto&x:p) if (l<=x && x<=r) z.pb(x);

		int Z;
		int k=z.size();
		for (int j=k-1; j>=0; --j) {
			int x=z[j];
			auto q=query(x);
			if (q[0]+q[1]>f) {
				f=q[0]+q[1];
				for(auto&x:t) ft.add(x,1);
				t.clear();
			}
			if (q[0]+q[1]==0) return x;
			if (q[0]+q[1]<f) {
				ft.add(x,1);
				z.pop_back();
				continue;
			} 
			t.pb(x);
			Z=q[0]-ft.sum(r); break;
		}
		forn(it,Z) {
			int k=z.size();
			int r=k-1;
			int lq=0, rq=r;
			while (lq<rq) {
				int m=(lq+rq)>>1;
				int x=z[m];
				auto q=query(x);
				if (q[0]+q[1]==0) return x;
				if (q[0]+q[1]>f) {
					f=q[0]+q[1];
					for(auto&x:t) ft.add(x,1);
					t.clear();
				}
				if (q[0]+q[1]<f) {
					vector<int> b; forn(i,k) if (i!=m) b.pb(z[i]);
					z=b;
					ft.add(x,1);
					break;
				}
				if (q[0]==ft.sum(x)) lq=m+1;
				else rq=m;
				t.pb(x);
			}
			if (z.size()<k) continue;
			int x=z[r];
			if (!mem.count(x)) zzz.pb(x);
			else {
				auto q=query(x);
				if (q[0]+q[1]==0) return x;
			}
			vector<int> b; forn(i,k) if (i!=r) b.pb(z[i]);
			z=b;
			ft.add(x,1);
			if (!z.size()) break;
		}
	}
	shuffle(all(zzz),rng);
	for(auto&x:zzz) {
		auto q=query(x); if (q[0]+q[1]==0) return x;
	}
}

Compilation message

prize.cpp: In function 'int find_best(int)':
prize.cpp:94:16: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   94 |    if (z.size()<k) continue;
      |        ~~~~~~~~^~
prize.cpp:35:10: warning: control reaches end of non-void function [-Wreturn-type]
   35 |  BIT ft(n);
      |          ^
prize.cpp:4:32: warning: 'Z' may be used uninitialized in this function [-Wmaybe-uninitialized]
    4 | #define forn(i,n) for(int i=0;i<n;++i)
      |                                ^
prize.cpp:51:7: note: 'Z' was declared here
   51 |   int Z;
      |       ^

Subtask #1
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 25 ms 2112 KB Output is correct
2 Correct 55 ms 2204 KB Output is correct
3 Correct 76 ms 2204 KB Output is correct
4 Correct 70 ms 2112 KB Output is correct
5 Correct 38 ms 2208 KB Output is correct
6 Correct 2 ms 2248 KB Output is correct
7 Correct 63 ms 2208 KB Output is correct
8 Correct 72 ms 2208 KB Output is correct
9 Correct 45 ms 2200 KB Output is correct
10 Correct 124 ms 2248 KB Output is correct

Subtask #2
80.0 / 80.0

# Verdict Execution time Memory Grader output
1 Correct 15 ms 2208 KB Output is correct
2 Correct 70 ms 2204 KB Output is correct
3 Correct 73 ms 2240 KB Output is correct
4 Correct 99 ms 2248 KB Output is correct
5 Correct 38 ms 2196 KB Output is correct
6 Correct 2 ms 2208 KB Output is correct
7 Correct 60 ms 2200 KB Output is correct
8 Correct 64 ms 2212 KB Output is correct
9 Correct 42 ms 2248 KB Output is correct
10 Correct 104 ms 2248 KB Output is correct
11 Correct 46 ms 2208 KB Output is correct
12 Correct 5 ms 2248 KB Output is correct
13 Correct 104 ms 2208 KB Output is correct
14 Correct 2 ms 592 KB Output is correct
15 Correct 27 ms 2208 KB Output is correct
16 Correct 136 ms 2256 KB Output is correct
17 Correct 2 ms 2184 KB Output is correct
18 Correct 117 ms 2356 KB Output is correct
19 Correct 2 ms 2200 KB Output is correct
20 Correct 17 ms 1228 KB Output is correct
21 Correct 43 ms 2200 KB Output is correct
22 Correct 10 ms 2136 KB Output is correct
23 Correct 11 ms 2208 KB Output is correct
24 Correct 2 ms 2240 KB Output is correct
25 Correct 59 ms 2200 KB Output is correct
26 Correct 54 ms 2208 KB Output is correct
27 Correct 39 ms 2196 KB Output is correct
28 Correct 120 ms 2272 KB Output is correct
29 Correct 157 ms 2248 KB Output is correct
30 Correct 204 ms 2272 KB Output is correct
31 Correct 2 ms 2208 KB Output is correct
32 Correct 84 ms 2208 KB Output is correct
33 Correct 1 ms 208 KB Output is correct
34 Correct 33 ms 2196 KB Output is correct
35 Correct 48 ms 2248 KB Output is correct
36 Correct 36 ms 2248 KB Output is correct
37 Correct 16 ms 2196 KB Output is correct
38 Correct 17 ms 2200 KB Output is correct
39 Correct 54 ms 2248 KB Output is correct
40 Correct 104 ms 2196 KB Output is correct
41 Correct 76 ms 2208 KB Output is correct
42 Correct 55 ms 2236 KB Output is correct
43 Correct 60 ms 2248 KB Output is correct
44 Correct 60 ms 2248 KB Output is correct
45 Correct 39 ms 2208 KB Output is correct
46 Correct 2 ms 2248 KB Output is correct
47 Correct 47 ms 2240 KB Output is correct
48 Correct 80 ms 2200 KB Output is correct
49 Correct 8 ms 2204 KB Output is correct
50 Correct 103 ms 2204 KB Output is correct
51 Correct 48 ms 2196 KB Output is correct
52 Correct 2 ms 2208 KB Output is correct
53 Correct 69 ms 2204 KB Output is correct
54 Correct 50 ms 2204 KB Output is correct
55 Correct 2 ms 2208 KB Output is correct
56 Correct 129 ms 2268 KB Output is correct
57 Correct 92 ms 2200 KB Output is correct
58 Correct 78 ms 2204 KB Output is correct
59 Correct 68 ms 2208 KB Output is correct
60 Correct 84 ms 2208 KB Output is correct
61 Correct 74 ms 2208 KB Output is correct
62 Correct 10 ms 2196 KB Output is correct
63 Correct 66 ms 2204 KB Output is correct
64 Correct 43 ms 2200 KB Output is correct
65 Correct 100 ms 2224 KB Output is correct
66 Correct 72 ms 2240 KB Output is correct
67 Correct 79 ms 2248 KB Output is correct
68 Correct 3 ms 2200 KB Output is correct
69 Correct 111 ms 2204 KB Output is correct
70 Correct 89 ms 2200 KB Output is correct
71 Correct 110 ms 2372 KB Output is correct
72 Correct 97 ms 2248 KB Output is correct
73 Correct 128 ms 2364 KB Output is correct
74 Correct 118 ms 2372 KB Output is correct
75 Correct 100 ms 2208 KB Output is correct
76 Correct 101 ms 2300 KB Output is correct
77 Correct 122 ms 2252 KB Output is correct
78 Correct 83 ms 2248 KB Output is correct
79 Correct 79 ms 2248 KB Output is correct
80 Correct 192 ms 2296 KB Output is correct
81 Correct 95 ms 2280 KB Output is correct
82 Correct 115 ms 2248 KB Output is correct
83 Correct 85 ms 2248 KB Output is correct
84 Correct 130 ms 2272 KB Output is correct
85 Correct 174 ms 2324 KB Output is correct
86 Correct 94 ms 2248 KB Output is correct
87 Correct 88 ms 2208 KB Output is correct
88 Correct 92 ms 2208 KB Output is correct
89 Correct 97 ms 2248 KB Output is correct
90 Correct 139 ms 2248 KB Output is correct
91 Correct 93 ms 2248 KB Output is correct
92 Correct 73 ms 2248 KB Output is correct
93 Correct 67 ms 2248 KB Output is correct
94 Correct 85 ms 2248 KB Output is correct
95 Correct 101 ms 2248 KB Output is correct
96 Correct 79 ms 2248 KB Output is correct
97 Correct 92 ms 2248 KB Output is correct