oj.uz

Submission #559740

# Submission time Handle Problem Language Result Execution time Memory
559740 2022-05-10T13:27:28 Z jamezzz The Big Prize (IOI17_prize) C++17
100 / 100
 91 ms 16344 KB 
#include "prize.h"
#include <bits/stdc++.h>
using namespace std;

int ans,worst;
mt19937 rng(4);

vector<vector<int>> memo;
vector<int> myask(int i){
	if(memo[i][0]!=-1)return memo[i];
	return memo[i]=ask(i);
}

void dnc(vector<int> v,int good,int lgood,int rgood){
	if(good==0)return;
	if(v.size()==0)return;
	
	//printf("dnc: {");
	//for(int i:v)printf("%d ",i);
	//printf("} %d %d %d\n",good,lgood,rgood);
	
	int m=v.size()/2;
	
	vector<int> idk;
	for(int i=0;i<v.size();++i){
		if(memo[v[i]][0]!=-1&&memo[v[i]][0]+memo[v[i]][1]==worst)idk.push_back(i);
	}
	//for(int i:idk)printf("%d ",i);printf("\n");
	if(idk.size()!=0)m=idk[idk.size()/2];
	
	int s=m;
	while(m<v.size()){
		vector<int> res=myask(v[m]);
		if(res[0]+res[1]==0){
			ans=v[m];return;
		}
		if(res[0]+res[1]==worst){
			int mid=m-s;
			vector<int> l,r;
			for(int i=0;i<s;++i)l.push_back(v[i]);
			for(int i=m+1;i<v.size();++i)r.push_back(v[i]);
			dnc(l,res[0]-mid-lgood,lgood,res[1]+mid);
			dnc(r,res[1]-mid-rgood,res[0]+mid,rgood);
			return;
		}
		else ++m;
	}
	
	vector<int> l;
	int mid=m-s;
	for(int i=0;i<s;++i)l.push_back(v[i]);
	dnc(l,good-mid,lgood,rgood+mid);
}

int find_best(int n){
	memo.resize(n);
	for(int i=0;i<n;++i)memo[i].resize(2,-1);
	
	for(int i=0;i<min(n,500);++i){
		int x=rng()%n;
		vector<int> res=myask(x);
		worst=max(worst,res[0]+res[1]);
		if(res[0]+res[1]==0)return x;
	}
	
	vector<int> v;
	for(int i=0;i<n;++i)v.push_back(i);
	
	dnc(v,worst,0,0);
	return ans;
}

Compilation message

prize.cpp: In function 'void dnc(std::vector<int>, int, int, int)':
prize.cpp:25:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   25 |  for(int i=0;i<v.size();++i){
      |              ~^~~~~~~~~
prize.cpp:32:9: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   32 |  while(m<v.size()){
      |        ~^~~~~~~~~
prize.cpp:41:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   41 |    for(int i=m+1;i<v.size();++i)r.push_back(v[i]);
      |                  ~^~~~~~~~~

Subtask #1
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 22 ms 15268 KB Output is correct
2 Correct 20 ms 15480 KB Output is correct
3 Correct 24 ms 15300 KB Output is correct
4 Correct 27 ms 15268 KB Output is correct
5 Correct 23 ms 15336 KB Output is correct
6 Correct 22 ms 15252 KB Output is correct
7 Correct 24 ms 15208 KB Output is correct
8 Correct 23 ms 15216 KB Output is correct
9 Correct 21 ms 15260 KB Output is correct
10 Correct 22 ms 15424 KB Output is correct

Subtask #2
80.0 / 80.0

# Verdict Execution time Memory Grader output
1 Correct 21 ms 15212 KB Output is correct
2 Correct 23 ms 15508 KB Output is correct
3 Correct 23 ms 15312 KB Output is correct
4 Correct 22 ms 15164 KB Output is correct
5 Correct 21 ms 15252 KB Output is correct
6 Correct 20 ms 15288 KB Output is correct
7 Correct 20 ms 15260 KB Output is correct
8 Correct 26 ms 15272 KB Output is correct
9 Correct 22 ms 15240 KB Output is correct
10 Correct 20 ms 15480 KB Output is correct
11 Correct 32 ms 15664 KB Output is correct
12 Correct 38 ms 15676 KB Output is correct
13 Correct 37 ms 15660 KB Output is correct
14 Correct 17 ms 1928 KB Output is correct
15 Correct 76 ms 15776 KB Output is correct
16 Correct 79 ms 15768 KB Output is correct
17 Correct 74 ms 15724 KB Output is correct
18 Correct 79 ms 15724 KB Output is correct
19 Correct 87 ms 15780 KB Output is correct
20 Correct 46 ms 7960 KB Output is correct
21 Correct 72 ms 15740 KB Output is correct
22 Correct 56 ms 15828 KB Output is correct
23 Correct 30 ms 15624 KB Output is correct
24 Correct 33 ms 15612 KB Output is correct
25 Correct 71 ms 15856 KB Output is correct
26 Correct 70 ms 15804 KB Output is correct
27 Correct 25 ms 15468 KB Output is correct
28 Correct 64 ms 15660 KB Output is correct
29 Correct 69 ms 15764 KB Output is correct
30 Correct 80 ms 15616 KB Output is correct
31 Correct 75 ms 15624 KB Output is correct
32 Correct 31 ms 15620 KB Output is correct
33 Correct 1 ms 208 KB Output is correct
34 Correct 78 ms 15628 KB Output is correct
35 Correct 31 ms 15596 KB Output is correct
36 Correct 77 ms 15752 KB Output is correct
37 Correct 32 ms 15636 KB Output is correct
38 Correct 26 ms 15592 KB Output is correct
39 Correct 73 ms 15912 KB Output is correct
40 Correct 75 ms 15768 KB Output is correct
41 Correct 70 ms 15628 KB Output is correct
42 Correct 66 ms 15744 KB Output is correct
43 Correct 82 ms 15772 KB Output is correct
44 Correct 78 ms 15640 KB Output is correct
45 Correct 68 ms 15836 KB Output is correct
46 Correct 88 ms 15780 KB Output is correct
47 Correct 77 ms 15788 KB Output is correct
48 Correct 72 ms 15776 KB Output is correct
49 Correct 72 ms 15732 KB Output is correct
50 Correct 88 ms 15768 KB Output is correct
51 Correct 68 ms 15700 KB Output is correct
52 Correct 73 ms 15760 KB Output is correct
53 Correct 28 ms 15592 KB Output is correct
54 Correct 74 ms 15768 KB Output is correct
55 Correct 71 ms 15804 KB Output is correct
56 Correct 77 ms 15720 KB Output is correct
57 Correct 81 ms 15880 KB Output is correct
58 Correct 69 ms 15748 KB Output is correct
59 Correct 91 ms 15692 KB Output is correct
60 Correct 70 ms 15692 KB Output is correct
61 Correct 28 ms 15456 KB Output is correct
62 Correct 28 ms 15492 KB Output is correct
63 Correct 28 ms 15556 KB Output is correct
64 Correct 29 ms 15464 KB Output is correct
65 Correct 23 ms 15420 KB Output is correct
66 Correct 24 ms 15264 KB Output is correct
67 Correct 24 ms 15248 KB Output is correct
68 Correct 22 ms 15264 KB Output is correct
69 Correct 24 ms 15252 KB Output is correct
70 Correct 24 ms 15272 KB Output is correct
71 Correct 70 ms 15744 KB Output is correct
72 Correct 41 ms 15724 KB Output is correct
73 Correct 76 ms 15728 KB Output is correct
74 Correct 80 ms 15716 KB Output is correct
75 Correct 29 ms 15732 KB Output is correct
76 Correct 71 ms 15640 KB Output is correct
77 Correct 84 ms 15728 KB Output is correct
78 Correct 40 ms 15760 KB Output is correct
79 Correct 54 ms 15740 KB Output is correct
80 Correct 59 ms 15740 KB Output is correct
81 Correct 73 ms 15664 KB Output is correct
82 Correct 80 ms 15684 KB Output is correct
83 Correct 27 ms 15676 KB Output is correct
84 Correct 79 ms 15804 KB Output is correct
85 Correct 55 ms 15740 KB Output is correct
86 Correct 65 ms 16088 KB Output is correct
87 Correct 32 ms 15740 KB Output is correct
88 Correct 48 ms 16344 KB Output is correct
89 Correct 63 ms 16172 KB Output is correct
90 Correct 34 ms 15720 KB Output is correct
91 Correct 61 ms 16144 KB Output is correct
92 Correct 74 ms 16280 KB Output is correct
93 Correct 69 ms 16228 KB Output is correct
94 Correct 68 ms 16140 KB Output is correct
95 Correct 68 ms 16072 KB Output is correct
96 Correct 69 ms 16132 KB Output is correct
97 Correct 65 ms 16176 KB Output is correct