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Submission #1073079

# Submission time Handle Problem Language Result Execution time Memory
1073079 2024-08-24T09:18:34 Z Zicrus Radio Towers (IOI22_towers) C++17
23 / 100
 4000 ms 5580 KB 
#include <bits/stdc++.h>
#include "towers.h"
using namespace std;

typedef long long ll;

int n, pow2;
vector<int> h;
vector<int> segMn, segMx, segPeak, segVal;
bool initialized;

int nxtPeak(int i, int val) {
    i += pow2;
    while (i) {
        if (segMx[i] >= val) break;
        if (i & 1) {
            if ((i & (i+1)) == 0) return n;
            i++;
        }
        i /= 2;
    }
    while (i < pow2) {
        if (segMx[2*i] >= val) i = 2*i;
        else i = 2*i+1;
    }
    return i-pow2;
}

int nxtVal(int i, int val) {
    i += pow2;
    while (i) {
        if (segMn[i] <= val) break;
        if (i & 1) {
            if ((i & (i+1)) == 0) return n;
            i++;
        }
        i /= 2;
    }
    while (i < pow2) {
        if (segMn[2*i] <= val) i = 2*i;
        else i = 2*i+1;
    }
    return i-pow2;
}

void setSegPeak(int i, int val) {
    i += pow2;
    segPeak[i] = val;
    i /= 2;
    while (i) {
        segPeak[i] = min(segPeak[2*i], segPeak[2*i+1]);
        i /= 2;
    }
}

void setSegVal(int i, int val) {
    i += pow2;
    segVal[i] = val;
    i /= 2;
    while (i) {
        segVal[i] = min(segVal[2*i], segVal[2*i+1]);
        i /= 2;
    }
}

int getSegPeak(int low, int high) {
    low += pow2; high += pow2;
    int res = n;
    while (low <= high) {
        if (low & 1) res = min(res, segPeak[low++]);
        if (!(high & 1)) res = min(res, segPeak[high--]);
        low /= 2; high /= 2;
    }
    return res;
}

int getSegVal(int low, int high) {
    low += pow2; high += pow2;
    int res = n;
    while (low <= high) {
        if (low & 1) res = min(res, segVal[low++]);
        if (!(high & 1)) res = min(res, segVal[high--]);
        low /= 2; high /= 2;
    }
    return res;
}

void init(int N, vector<int> H) {
    n = N; h = H;
    initialized = false;
    pow2 = 1 << (int)ceil(log2(n));
    segMn = vector<int>(2*pow2);
    segMx = vector<int>(2*pow2);
    for (int i = 0; i < n; i++) {
        segMn[pow2+i] = h[i];
        segMx[pow2+i] = h[i];
    }
    for (int i = pow2-1; i > 0; i--) {
        segMn[i] = min(segMn[2*i], segMn[2*i+1]);
        segMx[i] = max(segMx[2*i], segMx[2*i+1]);
    }
}

void init2(int D) {
    initialized = true;
    segPeak = vector<int>(2*pow2, n);
    segVal = vector<int>(2*pow2, n);
    for (int i = n-2; i >= 0; i--) {
        int nxtP = nxtPeak(i+1, h[i]+D);
        int nxtV = nxtVal(i+1, h[i]-D);
        nxtP = min(nxtP, getSegPeak(i+1, nxtP-1));
        nxtV = min(nxtV, getSegVal(i+1, nxtV-1));
        setSegPeak(i, nxtP);
        setSegVal(i, nxtV);
    }
}

int max_towers(int L, int R, int D) {
    if (!initialized) init2(D);
    
    int res = 0;
    bool foundK = false;
    int cur = L;
    while (cur <= R) {
        res++;
        cur = segPeak[pow2+cur];
        cur = segVal[pow2+cur];
    }
    return res;
}

#ifdef TEST
#include "stub.cpp"
#endif

Compilation message

towers.cpp: In function 'int max_towers(int, int, int)':
towers.cpp:122:10: warning: unused variable 'foundK' [-Wunused-variable]
  122 |     bool foundK = false;
      |          ^~~~~~

Subtask #1
0 / 4.0

# Verdict Execution time Memory Grader output
1 Incorrect 353 ms 2924 KB 31st lines differ - on the 1st token, expected: '1', found: '2'
2 Halted 0 ms 0 KB -

Subtask #2
11.0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 344 KB Output is correct
2 Correct 1 ms 344 KB Output is correct
3 Correct 1 ms 344 KB Output is correct
4 Correct 1 ms 344 KB Output is correct
5 Correct 1 ms 344 KB Output is correct
6 Correct 1 ms 344 KB Output is correct
7 Correct 1 ms 344 KB Output is correct
8 Correct 1 ms 344 KB Output is correct
9 Correct 1 ms 344 KB Output is correct
10 Correct 1 ms 344 KB Output is correct
11 Correct 1 ms 344 KB Output is correct
12 Correct 0 ms 344 KB Output is correct
13 Correct 1 ms 344 KB Output is correct
14 Correct 1 ms 344 KB Output is correct
15 Correct 1 ms 344 KB Output is correct
16 Correct 1 ms 344 KB Output is correct
17 Correct 1 ms 344 KB Output is correct
18 Correct 1 ms 520 KB Output is correct
19 Correct 1 ms 344 KB Output is correct
20 Correct 1 ms 344 KB Output is correct
21 Correct 0 ms 344 KB Output is correct
22 Correct 1 ms 344 KB Output is correct
23 Correct 1 ms 344 KB Output is correct
24 Correct 1 ms 344 KB Output is correct
25 Correct 1 ms 344 KB Output is correct
26 Correct 1 ms 344 KB Output is correct
27 Correct 1 ms 344 KB Output is correct
28 Correct 1 ms 344 KB Output is correct
29 Correct 1 ms 344 KB Output is correct
30 Correct 1 ms 344 KB Output is correct
31 Correct 1 ms 344 KB Output is correct
32 Correct 1 ms 344 KB Output is correct
33 Correct 1 ms 344 KB Output is correct
34 Correct 1 ms 344 KB Output is correct
35 Correct 1 ms 516 KB Output is correct

Subtask #3
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 344 KB Output is correct
2 Correct 1 ms 344 KB Output is correct
3 Correct 1 ms 344 KB Output is correct
4 Correct 1 ms 344 KB Output is correct
5 Correct 1 ms 344 KB Output is correct
6 Correct 1 ms 344 KB Output is correct
7 Correct 1 ms 344 KB Output is correct
8 Correct 1 ms 344 KB Output is correct
9 Correct 1 ms 344 KB Output is correct
10 Correct 1 ms 344 KB Output is correct
11 Correct 1 ms 344 KB Output is correct
12 Correct 0 ms 344 KB Output is correct
13 Correct 1 ms 344 KB Output is correct
14 Correct 1 ms 344 KB Output is correct
15 Correct 1 ms 344 KB Output is correct
16 Correct 1 ms 344 KB Output is correct
17 Correct 1 ms 344 KB Output is correct
18 Correct 1 ms 520 KB Output is correct
19 Correct 1 ms 344 KB Output is correct
20 Correct 1 ms 344 KB Output is correct
21 Correct 0 ms 344 KB Output is correct
22 Correct 1 ms 344 KB Output is correct
23 Correct 1 ms 344 KB Output is correct
24 Correct 1 ms 344 KB Output is correct
25 Correct 1 ms 344 KB Output is correct
26 Correct 1 ms 344 KB Output is correct
27 Correct 1 ms 344 KB Output is correct
28 Correct 1 ms 344 KB Output is correct
29 Correct 1 ms 344 KB Output is correct
30 Correct 1 ms 344 KB Output is correct
31 Correct 1 ms 344 KB Output is correct
32 Correct 1 ms 344 KB Output is correct
33 Correct 1 ms 344 KB Output is correct
34 Correct 1 ms 344 KB Output is correct
35 Correct 1 ms 516 KB Output is correct
36 Correct 15 ms 2904 KB Output is correct
37 Correct 41 ms 5328 KB Output is correct
38 Correct 36 ms 5300 KB Output is correct
39 Correct 41 ms 5328 KB Output is correct
40 Correct 28 ms 5328 KB Output is correct
41 Correct 35 ms 5328 KB Output is correct
42 Correct 30 ms 5328 KB Output is correct
43 Correct 48 ms 5328 KB Output is correct
44 Correct 46 ms 5328 KB Output is correct
45 Correct 52 ms 5580 KB Output is correct
46 Correct 42 ms 5328 KB Output is correct
47 Correct 22 ms 5328 KB Output is correct
48 Correct 22 ms 5328 KB Output is correct
49 Correct 24 ms 5324 KB Output is correct
50 Correct 39 ms 5328 KB Output is correct
51 Correct 35 ms 5328 KB Output is correct
52 Correct 28 ms 5308 KB Output is correct
53 Correct 24 ms 5328 KB Output is correct
54 Correct 21 ms 5328 KB Output is correct
55 Correct 30 ms 5200 KB Output is correct
56 Correct 31 ms 5328 KB Output is correct
57 Correct 34 ms 5084 KB Output is correct
58 Correct 32 ms 5328 KB Output is correct
59 Correct 29 ms 5328 KB Output is correct
60 Correct 29 ms 5328 KB Output is correct
61 Correct 26 ms 5328 KB Output is correct
62 Correct 33 ms 5216 KB Output is correct
63 Correct 26 ms 5328 KB Output is correct
64 Correct 46 ms 5328 KB Output is correct
65 Correct 47 ms 5328 KB Output is correct
66 Correct 44 ms 5328 KB Output is correct
67 Correct 50 ms 5328 KB Output is correct

Subtask #4
0 / 14.0

# Verdict Execution time Memory Grader output
1 Execution timed out 4078 ms 5332 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #5
0 / 17.0

# Verdict Execution time Memory Grader output
1 Incorrect 1251 ms 1744 KB 2nd lines differ - on the 1st token, expected: '7063', found: '7197'
2 Halted 0 ms 0 KB -

Subtask #6
0 / 19.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 344 KB Output is correct
2 Correct 1 ms 344 KB Output is correct
3 Correct 1 ms 344 KB Output is correct
4 Correct 1 ms 344 KB Output is correct
5 Correct 1 ms 344 KB Output is correct
6 Correct 1 ms 344 KB Output is correct
7 Correct 1 ms 344 KB Output is correct
8 Correct 1 ms 344 KB Output is correct
9 Correct 1 ms 344 KB Output is correct
10 Correct 1 ms 344 KB Output is correct
11 Correct 1 ms 344 KB Output is correct
12 Correct 0 ms 344 KB Output is correct
13 Correct 1 ms 344 KB Output is correct
14 Correct 1 ms 344 KB Output is correct
15 Correct 1 ms 344 KB Output is correct
16 Correct 1 ms 344 KB Output is correct
17 Correct 1 ms 344 KB Output is correct
18 Correct 1 ms 520 KB Output is correct
19 Correct 1 ms 344 KB Output is correct
20 Correct 1 ms 344 KB Output is correct
21 Correct 0 ms 344 KB Output is correct
22 Correct 1 ms 344 KB Output is correct
23 Correct 1 ms 344 KB Output is correct
24 Correct 1 ms 344 KB Output is correct
25 Correct 1 ms 344 KB Output is correct
26 Correct 1 ms 344 KB Output is correct
27 Correct 1 ms 344 KB Output is correct
28 Correct 1 ms 344 KB Output is correct
29 Correct 1 ms 344 KB Output is correct
30 Correct 1 ms 344 KB Output is correct
31 Correct 1 ms 344 KB Output is correct
32 Correct 1 ms 344 KB Output is correct
33 Correct 1 ms 344 KB Output is correct
34 Correct 1 ms 344 KB Output is correct
35 Correct 1 ms 516 KB Output is correct
36 Correct 15 ms 2904 KB Output is correct
37 Correct 41 ms 5328 KB Output is correct
38 Correct 36 ms 5300 KB Output is correct
39 Correct 41 ms 5328 KB Output is correct
40 Correct 28 ms 5328 KB Output is correct
41 Correct 35 ms 5328 KB Output is correct
42 Correct 30 ms 5328 KB Output is correct
43 Correct 48 ms 5328 KB Output is correct
44 Correct 46 ms 5328 KB Output is correct
45 Correct 52 ms 5580 KB Output is correct
46 Correct 42 ms 5328 KB Output is correct
47 Correct 22 ms 5328 KB Output is correct
48 Correct 22 ms 5328 KB Output is correct
49 Correct 24 ms 5324 KB Output is correct
50 Correct 39 ms 5328 KB Output is correct
51 Correct 35 ms 5328 KB Output is correct
52 Correct 28 ms 5308 KB Output is correct
53 Correct 24 ms 5328 KB Output is correct
54 Correct 21 ms 5328 KB Output is correct
55 Correct 30 ms 5200 KB Output is correct
56 Correct 31 ms 5328 KB Output is correct
57 Correct 34 ms 5084 KB Output is correct
58 Correct 32 ms 5328 KB Output is correct
59 Correct 29 ms 5328 KB Output is correct
60 Correct 29 ms 5328 KB Output is correct
61 Correct 26 ms 5328 KB Output is correct
62 Correct 33 ms 5216 KB Output is correct
63 Correct 26 ms 5328 KB Output is correct
64 Correct 46 ms 5328 KB Output is correct
65 Correct 47 ms 5328 KB Output is correct
66 Correct 44 ms 5328 KB Output is correct
67 Correct 50 ms 5328 KB Output is correct
68 Execution timed out 4078 ms 5332 KB Time limit exceeded
69 Halted 0 ms 0 KB -

Subtask #7
0 / 23.0

# Verdict Execution time Memory Grader output
1 Incorrect 353 ms 2924 KB 31st lines differ - on the 1st token, expected: '1', found: '2'
2 Halted 0 ms 0 KB -