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Submission #307097

# Submission time Handle Problem Language Result Execution time Memory
307097 2020-09-27T03:10:19 Z phathnv Finding Routers (IOI20_routers) C++14
100 / 100
 2 ms 768 KB 
#include "routers.h"
#include <bits/stdc++.h>

using namespace std;

int asked[200001];
int ask(int x){
    if (asked[x] != -1)
        return asked[x];
    asked[x] = use_detector(x);
    return asked[x];
}

vector <int> find_routers(int l, int n, int q){
    vector <int> res;
    res.push_back(0);
    int cur = 0;
    for(int i = 0; i <= l; i++)
        asked[i] = -1;

    if (n == 2){
        int mid = 1;
        for(int j = 16; j >= 0; j--){
            if (mid + (1 << j) > l)
                continue;
            if (ask(mid + (1 << j)) == 0)
                mid += (1 << j);
        }
        res.push_back(2 * mid);
        return res;
    }

    for(int i = 1; i < n; i++){
        int mid = cur + 1;
        while (ask(min(l, mid + 64)) == i - 1)
            mid = min(l, mid + 64);

        for(int j = 5; j >= 0; j--){
            if (mid + (1 << j) > l)
                continue;
            if (ask(mid + (1 << j)) == i - 1)
                mid += (1 << j);
        }
        int nxt = 2 * mid - cur;
        res.push_back(nxt);
        cur = nxt;
    }
    return res;
}

Subtask #1
16.0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 640 KB Output is correct
2 Correct 1 ms 768 KB Output is correct
3 Correct 1 ms 768 KB Output is correct
4 Correct 1 ms 768 KB Output is correct
5 Correct 1 ms 768 KB Output is correct
6 Correct 1 ms 768 KB Output is correct
7 Correct 1 ms 672 KB Output is correct
8 Correct 1 ms 768 KB Output is correct
9 Correct 1 ms 768 KB Output is correct
10 Correct 1 ms 768 KB Output is correct
11 Correct 1 ms 768 KB Output is correct
12 Correct 1 ms 768 KB Output is correct
13 Correct 1 ms 640 KB Output is correct
14 Correct 1 ms 640 KB Output is correct
15 Correct 1 ms 640 KB Output is correct
16 Correct 1 ms 768 KB Output is correct
17 Correct 1 ms 640 KB Output is correct
18 Correct 1 ms 640 KB Output is correct
19 Correct 1 ms 768 KB Output is correct
20 Correct 1 ms 640 KB Output is correct

Subtask #2
21.0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 768 KB Output is correct
2 Correct 1 ms 768 KB Output is correct
3 Correct 1 ms 768 KB Output is correct
4 Correct 1 ms 640 KB Output is correct
5 Correct 1 ms 768 KB Output is correct
6 Correct 1 ms 640 KB Output is correct
7 Correct 1 ms 640 KB Output is correct
8 Correct 1 ms 768 KB Output is correct
9 Correct 1 ms 640 KB Output is correct
10 Correct 1 ms 768 KB Output is correct
11 Correct 1 ms 640 KB Output is correct
12 Correct 1 ms 640 KB Output is correct
13 Correct 1 ms 640 KB Output is correct
14 Correct 1 ms 768 KB Output is correct
15 Correct 1 ms 768 KB Output is correct
16 Correct 1 ms 768 KB Output is correct
17 Correct 1 ms 768 KB Output is correct
18 Correct 1 ms 768 KB Output is correct
19 Correct 1 ms 768 KB Output is correct
20 Correct 1 ms 768 KB Output is correct

Subtask #3
23.0 / 23.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 768 KB Output is correct
2 Correct 1 ms 768 KB Output is correct
3 Correct 1 ms 640 KB Output is correct
4 Correct 1 ms 768 KB Output is correct
5 Correct 1 ms 640 KB Output is correct
6 Correct 1 ms 768 KB Output is correct
7 Correct 1 ms 768 KB Output is correct
8 Correct 1 ms 640 KB Output is correct
9 Correct 1 ms 640 KB Output is correct
10 Correct 1 ms 768 KB Output is correct
11 Correct 1 ms 640 KB Output is correct
12 Correct 1 ms 640 KB Output is correct
13 Correct 1 ms 768 KB Output is correct
14 Correct 1 ms 640 KB Output is correct
15 Correct 1 ms 768 KB Output is correct
16 Correct 1 ms 768 KB Output is correct
17 Correct 1 ms 640 KB Output is correct
18 Correct 1 ms 768 KB Output is correct
19 Correct 1 ms 768 KB Output is correct
20 Correct 1 ms 640 KB Output is correct

Subtask #4
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 768 KB Output is correct
2 Correct 2 ms 768 KB Output is correct
3 Correct 1 ms 768 KB Output is correct
4 Correct 1 ms 768 KB Output is correct
5 Correct 1 ms 768 KB Output is correct
6 Correct 1 ms 768 KB Output is correct
7 Correct 1 ms 768 KB Output is correct
8 Correct 1 ms 768 KB Output is correct
9 Correct 1 ms 768 KB Output is correct
10 Correct 2 ms 768 KB Output is correct
11 Correct 1 ms 768 KB Output is correct
12 Correct 1 ms 768 KB Output is correct
13 Correct 1 ms 768 KB Output is correct
14 Correct 1 ms 768 KB Output is correct
15 Correct 1 ms 768 KB Output is correct
16 Correct 1 ms 768 KB Output is correct
17 Correct 1 ms 768 KB Output is correct
18 Correct 2 ms 768 KB Output is correct
19 Correct 2 ms 768 KB Output is correct
20 Correct 1 ms 768 KB Output is correct
21 Correct 1 ms 768 KB Output is correct