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Submission #946345

# Submission time Handle Problem Language Result Execution time Memory
946345 2024-03-14T14:08:10 Z jay_jayjay The Big Prize (IOI17_prize) C++14
100 / 100
 30 ms 3040 KB 
// {{{1
extern "C" int __lsan_is_turned_off() { return 1; };
#include <bits/stdc++.h>
using namespace std;

#include <ext/pb_ds/assoc_container.hpp>

#ifdef DEBUG
#define dprintf(args...) fprintf(stderr,args)
#endif
#ifndef DEBUG
#define dprintf(args...) 42
#endif
#define ll long long
#define all(x) (x).begin(),(x).end()

#define mod int(1e9+7)
#define inf 0x3f3f3f3f
#define infl 0x3f3f3f3f3f3f3f3f

void sleep(int x) { this_thread::sleep_for(chrono::seconds(x)); }
struct { template<typename T> operator T() { T x; cin>>x; return x; } } in;

struct __rng {
        mt19937_64 _rng;
        __rng() {
                ll ctime = chrono::high_resolution_clock::now().time_since_epoch().count();
                _rng = mt19937_64(ctime);
        }
        
        ll randint(ll l, ll h) {
                return uniform_int_distribution<int>(l,h)(_rng);
        }
} rng;
// 1}}}
#define rank rank2
// #define DBG

#define N int(1e6)

vector<int> ask(int i);

#ifdef DBG
int n; vector<int> arr;
int pre[N][10], suf[N][10];
int q=0;
vector<int> ask(int i) {
        q++;
        // int l=0,r=0;
        // for(int j=0;j<i;j++)if(arr[j]<arr[i]) l++;
        // for(int j=i+1;j<n;j++)if(arr[j]<arr[i])r++;
        // assert(l == pre[i][arr[i]-1]);
        // assert(r == suf[i][arr[i]-1]);
        // return vector<int>{l,r};
        return vector<int>{pre[i][arr[i]-1],suf[i][arr[i]-1]};
}
#endif
int ans[N][2];
int best=-1;

void ask2(int i) {
        if(best == i) return;
        
        if(ans[i][0]+ans[i][1] == 0) {
                auto x = ask(i);
                ans[i][0] = x[0];
                ans[i][1] = x[1];
                if(ans[i][0]+ans[i][1] == 0) assert(best==-1), best &= i;
        }
}

int rank(int i) {
        ask2(i);
        return ans[i][0]+ans[i][1];
}

int right(int i) {
        ask2(i);
        return ans[i][1];
}



// lower rank is more rare
void solve(int l, int r) {
        if(best >= 0) return;
        if(r<l) return;
        if(l==r) return void(rank(l));
        while(rank(l) != rank(r)) {
                while(rank(l) < rank(r)) l++;
                while(rank(l) > rank(r)) r--;
        }
        if(right(l) == right(r)) return;
        
        int m=(l+r)/2;
        solve(l,m);
        solve(m,r);
}

int find_best(int n) {
        solve(0, n-1);
        assert(best >= 0);
        return best;
}

#ifdef DBG
int main() {
        n=in;arr.resize(n);for(auto&x:arr)x=in;
        for(int i=0;i<n;i++) {
                pre[i][arr[i]] = 1;
                suf[i][arr[i]] = 1;
        }
        for(int i=1;i<n;i++) for(int v=0;v<10;v++)pre[i][v]+=pre[i-1][v];
        for(int i=n-2;~i;i--)for(int v=0;v<10;v++)suf[i][v]+=suf[i+1][v];
        for(int i=0;i<n;i++)for(int v=1;v<10;v++)pre[i][v]+=pre[i][v-1], suf[i][v]+=suf[i][v-1];
        
        int ans = find_best(n);
        printf("%d\n",ans);
        printf("q=%d\n",q);
        return arr[ans]!=1;
}
#endif

Compilation message

prize.cpp:22:73: warning: 'in' defined but not used [-Wunused-variable]
   22 | struct { template<typename T> operator T() { T x; cin>>x; return x; } } in;
      |                                                                         ^~

Subtask #1
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 452 KB Output is correct
2 Correct 0 ms 444 KB Output is correct
3 Correct 0 ms 448 KB Output is correct
4 Correct 0 ms 444 KB Output is correct
5 Correct 0 ms 452 KB Output is correct
6 Correct 0 ms 448 KB Output is correct
7 Correct 0 ms 444 KB Output is correct
8 Correct 0 ms 452 KB Output is correct
9 Correct 0 ms 448 KB Output is correct
10 Correct 0 ms 484 KB Output is correct

Subtask #2
80.0 / 80.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 448 KB Output is correct
2 Correct 1 ms 700 KB Output is correct
3 Correct 0 ms 452 KB Output is correct
4 Correct 0 ms 452 KB Output is correct
5 Correct 1 ms 444 KB Output is correct
6 Correct 0 ms 448 KB Output is correct
7 Correct 1 ms 448 KB Output is correct
8 Correct 1 ms 444 KB Output is correct
9 Correct 1 ms 440 KB Output is correct
10 Correct 1 ms 480 KB Output is correct
11 Correct 1 ms 500 KB Output is correct
12 Correct 1 ms 452 KB Output is correct
13 Correct 3 ms 1024 KB Output is correct
14 Correct 1 ms 452 KB Output is correct
15 Correct 4 ms 848 KB Output is correct
16 Correct 16 ms 2756 KB Output is correct
17 Correct 0 ms 452 KB Output is correct
18 Correct 25 ms 2716 KB Output is correct
19 Correct 0 ms 448 KB Output is correct
20 Correct 6 ms 1012 KB Output is correct
21 Correct 10 ms 1456 KB Output is correct
22 Correct 2 ms 752 KB Output is correct
23 Correct 0 ms 452 KB Output is correct
24 Correct 0 ms 608 KB Output is correct
25 Correct 10 ms 1684 KB Output is correct
26 Correct 13 ms 1784 KB Output is correct
27 Correct 1 ms 656 KB Output is correct
28 Correct 30 ms 1816 KB Output is correct
29 Correct 15 ms 2096 KB Output is correct
30 Correct 26 ms 2456 KB Output is correct
31 Correct 1 ms 704 KB Output is correct
32 Correct 2 ms 1064 KB Output is correct
33 Correct 0 ms 344 KB Output is correct
34 Correct 7 ms 1064 KB Output is correct
35 Correct 1 ms 764 KB Output is correct
36 Correct 5 ms 1176 KB Output is correct
37 Correct 1 ms 764 KB Output is correct
38 Correct 1 ms 608 KB Output is correct
39 Correct 9 ms 1092 KB Output is correct
40 Correct 18 ms 1976 KB Output is correct
41 Correct 14 ms 2104 KB Output is correct
42 Correct 12 ms 2016 KB Output is correct
43 Correct 12 ms 1392 KB Output is correct
44 Correct 9 ms 1452 KB Output is correct
45 Correct 6 ms 1140 KB Output is correct
46 Correct 1 ms 448 KB Output is correct
47 Correct 9 ms 1324 KB Output is correct
48 Correct 15 ms 2576 KB Output is correct
49 Correct 2 ms 1244 KB Output is correct
50 Correct 20 ms 2744 KB Output is correct
51 Correct 9 ms 1572 KB Output is correct
52 Correct 1 ms 488 KB Output is correct
53 Correct 1 ms 508 KB Output is correct
54 Correct 8 ms 1524 KB Output is correct
55 Correct 1 ms 448 KB Output is correct
56 Correct 21 ms 3040 KB Output is correct
57 Correct 17 ms 2616 KB Output is correct
58 Correct 16 ms 1852 KB Output is correct
59 Correct 11 ms 2060 KB Output is correct
60 Correct 11 ms 1500 KB Output is correct
61 Correct 1 ms 512 KB Output is correct
62 Correct 1 ms 452 KB Output is correct
63 Correct 1 ms 772 KB Output is correct
64 Correct 1 ms 508 KB Output is correct
65 Correct 1 ms 708 KB Output is correct
66 Correct 2 ms 444 KB Output is correct
67 Correct 3 ms 448 KB Output is correct
68 Correct 2 ms 452 KB Output is correct
69 Correct 2 ms 444 KB Output is correct
70 Correct 2 ms 448 KB Output is correct
71 Correct 21 ms 2160 KB Output is correct
72 Correct 2 ms 1124 KB Output is correct
73 Correct 22 ms 2656 KB Output is correct
74 Correct 25 ms 2588 KB Output is correct
75 Correct 1 ms 460 KB Output is correct
76 Correct 19 ms 1984 KB Output is correct
77 Correct 24 ms 1884 KB Output is correct
78 Correct 3 ms 1724 KB Output is correct
79 Correct 12 ms 2408 KB Output is correct
80 Correct 21 ms 2956 KB Output is correct
81 Correct 21 ms 2108 KB Output is correct
82 Correct 25 ms 2164 KB Output is correct
83 Correct 1 ms 704 KB Output is correct
84 Correct 21 ms 2556 KB Output is correct
85 Correct 30 ms 2292 KB Output is correct
86 Correct 2 ms 700 KB Output is correct
87 Correct 1 ms 444 KB Output is correct
88 Correct 2 ms 960 KB Output is correct
89 Correct 2 ms 964 KB Output is correct
90 Correct 1 ms 444 KB Output is correct
91 Correct 1 ms 708 KB Output is correct
92 Correct 1 ms 444 KB Output is correct
93 Correct 2 ms 980 KB Output is correct
94 Correct 2 ms 1264 KB Output is correct
95 Correct 2 ms 1224 KB Output is correct
96 Correct 2 ms 788 KB Output is correct
97 Correct 1 ms 488 KB Output is correct