oj.uz

Submission #117258

# Submission time Handle Problem Language Result Execution time Memory
117258 2019-06-15T12:22:01 Z emapandy The Big Prize (IOI17_prize) C++14
20 / 100
 58 ms 2240 KB 
#include<iostream>
#include<cstring>
#include<cstdio>
#include<vector>
#include<ctime>
#include<cstdlib>
#include<algorithm>
#include "prize.h"
using namespace std;
vector<int> res;
#define Maxn 200010
bool flag[Maxn];
int ans[Maxn][2];
int maxv=0,pos;
int answer;
void Ask(int x){
    if(flag[x])return;
    flag[x]=true;
    res=ask(x);
    ans[x][0]=res[0];ans[x][1]=res[1];
}
void solve(int l,int r,int ed,int val){
    if(l==r){
        Ask(l);
        if(ans[l][0]==0&&ans[l][1]==0)answer=l;
        return;
    }
    int mid=(l+r)>>1;
    if(ed==-1){
        solve(l,mid,ed,mid-l+1);
        solve(mid+1,r,ed,r-mid);
        return;
    }
    if(ed<=mid){
        if(val-(r-mid))solve(l,mid,ed,val-(r-mid));
        solve(mid+1,r,-1,r-mid);
        return;
    }
    int tmp=-1;
    for(int i=mid;i>=l;--i){
        Ask(i);
        if(ans[i][0]+ans[i][1]==maxv){
            tmp=i;
            break;
        }
    }
    if(tmp==-1){
        solve(l,mid,-1,mid-l+1);
        if(val-(mid-l+1))solve(mid+1,r,ed,val-(mid-l+1));
        return;
    }
    int now=ans[ed][0]-ans[tmp][0]-(mid-tmp)+r-ed;
    if(now)solve(mid+1,r,ed,now);
    now=val-now;
    if(now)solve(l,mid,tmp,now);
}
int find_best(int n){
    srand(time(NULL));
    for(register int i=1;i<=100;++i){
        int x=1ll*rand()*rand()%n;
        Ask(x);
        maxv=max(maxv,ans[x][0]+ans[x][1]);
    }
    int last;
    for(register int i=n-1;i>=0;--i){
        Ask(i);
        if(ans[i][0]==0&&ans[i][1]==0)return i;
        if(ans[i][0]+ans[i][1]==maxv){
            last=i;
            break;
        }
    }
    solve(0,n-1,last,ans[last][0]+ans[last][1]);
    return answer;
}

Compilation message

prize.cpp: In function 'int find_best(int)':
prize.cpp:64:9: warning: 'last' may be used uninitialized in this function [-Wmaybe-uninitialized]
     int last;
         ^~~~

Subtask #1
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 920 KB Output is correct
2 Correct 3 ms 888 KB Output is correct
3 Correct 3 ms 912 KB Output is correct
4 Correct 4 ms 760 KB Output is correct
5 Correct 5 ms 888 KB Output is correct
6 Correct 5 ms 896 KB Output is correct
7 Correct 3 ms 892 KB Output is correct
8 Correct 3 ms 836 KB Output is correct
9 Correct 4 ms 896 KB Output is correct
10 Correct 4 ms 768 KB Output is correct

Subtask #2
0 / 80.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 956 KB Output is correct
2 Correct 3 ms 1016 KB Output is correct
3 Correct 3 ms 816 KB Output is correct
4 Correct 4 ms 920 KB Output is correct
5 Correct 4 ms 760 KB Output is correct
6 Correct 4 ms 888 KB Output is correct
7 Correct 3 ms 800 KB Output is correct
8 Correct 4 ms 896 KB Output is correct
9 Correct 4 ms 888 KB Output is correct
10 Correct 3 ms 896 KB Output is correct
11 Correct 8 ms 1272 KB Output is correct
12 Correct 6 ms 1272 KB Output is correct
13 Correct 8 ms 1280 KB Output is correct
14 Correct 13 ms 432 KB Output is correct
15 Correct 19 ms 2060 KB Output is correct
16 Correct 19 ms 2040 KB Output is correct
17 Correct 29 ms 2036 KB Output is correct
18 Correct 18 ms 2104 KB Output is correct
19 Correct 23 ms 2096 KB Output is correct
20 Correct 13 ms 1224 KB Output is correct
21 Correct 20 ms 2108 KB Output is correct
22 Correct 16 ms 2240 KB Output is correct
23 Correct 3 ms 1096 KB Output is correct
24 Correct 10 ms 1144 KB Output is correct
25 Correct 32 ms 1912 KB Output is correct
26 Correct 17 ms 2056 KB Output is correct
27 Correct 3 ms 948 KB Output is correct
28 Correct 18 ms 2044 KB Output is correct
29 Correct 21 ms 1960 KB Output is correct
30 Correct 19 ms 2148 KB Output is correct
31 Correct 36 ms 2040 KB Output is correct
32 Correct 10 ms 1344 KB Output is correct
33 Correct 2 ms 332 KB Output is correct
34 Correct 19 ms 2220 KB Output is correct
35 Correct 5 ms 1016 KB Output is correct
36 Correct 18 ms 2028 KB Output is correct
37 Correct 8 ms 1272 KB Output is correct
38 Correct 3 ms 972 KB Output is correct
39 Correct 19 ms 2100 KB Output is correct
40 Correct 53 ms 1960 KB Output is correct
41 Correct 36 ms 2040 KB Output is correct
42 Correct 33 ms 1996 KB Output is correct
43 Correct 19 ms 2124 KB Output is correct
44 Correct 19 ms 2096 KB Output is correct
45 Correct 30 ms 2040 KB Output is correct
46 Correct 54 ms 1964 KB Output is correct
47 Correct 24 ms 2092 KB Output is correct
48 Correct 51 ms 2000 KB Output is correct
49 Correct 44 ms 2044 KB Output is correct
50 Correct 19 ms 2140 KB Output is correct
51 Correct 19 ms 2092 KB Output is correct
52 Correct 48 ms 2040 KB Output is correct
53 Correct 4 ms 888 KB Output is correct
54 Correct 32 ms 1960 KB Output is correct
55 Correct 18 ms 2120 KB Output is correct
56 Correct 28 ms 1960 KB Output is correct
57 Correct 18 ms 2124 KB Output is correct
58 Correct 34 ms 2044 KB Output is correct
59 Correct 28 ms 2156 KB Output is correct
60 Correct 27 ms 1960 KB Output is correct
61 Correct 3 ms 1092 KB Output is correct
62 Correct 3 ms 1032 KB Output is correct
63 Correct 5 ms 956 KB Output is correct
64 Correct 4 ms 1016 KB Output is correct
65 Correct 2 ms 884 KB Output is correct
66 Correct 4 ms 760 KB Output is correct
67 Correct 8 ms 760 KB Output is correct
68 Correct 4 ms 860 KB Output is correct
69 Correct 2 ms 880 KB Output is correct
70 Correct 5 ms 764 KB Output is correct
71 Correct 48 ms 2040 KB Output is correct
72 Correct 6 ms 1408 KB Output is correct
73 Correct 30 ms 2064 KB Output is correct
74 Correct 32 ms 2040 KB Output is correct
75 Correct 5 ms 896 KB Output is correct
76 Correct 18 ms 2132 KB Output is correct
77 Correct 58 ms 1960 KB Output is correct
78 Correct 5 ms 1420 KB Output is correct
79 Correct 12 ms 2052 KB Output is correct
80 Correct 21 ms 2052 KB Output is correct
81 Correct 50 ms 2040 KB Output is correct
82 Correct 43 ms 2052 KB Output is correct
83 Correct 5 ms 1024 KB Output is correct
84 Correct 24 ms 2040 KB Output is correct
85 Correct 45 ms 2096 KB Output is correct
86 Correct 28 ms 1744 KB Output is correct
87 Correct 8 ms 1144 KB Output is correct
88 Incorrect 34 ms 1028 KB Incorrect
89 Halted 0 ms 0 KB -