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답안 #850660

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
850660 2023-09-17T08:34:08 Z Dextar 송신탑 (IOI22_towers) C++17
27 / 100
 4000 ms 28676 KB 
#include <cstdio>
#ifdef DEBUG
    #define D(X) X
#else
    #define D(X)
#endif
#include <bits/stdc++.h>
#define F first
#define S second
#define ll long long
#define pi 3.14159265359
#define pub push_back
#define pob pop_back
#define pari pair<int,int>
#define parli pair<long, long>

using namespace std;

const int INF = 1000 * 1000 * 1000;
const ll INF2 = 1LL * 1000 * 1000 * 1000 * 1000 * 1000 * 1000;
const int mod = 1000 * 1000 * 1000 + 7;

bool comp(vector<ll>& v1, vector<ll>& v2)
{
    return v1[0] < v2[0];
}


struct seg {
      vector<int> tree;
      int sz;

      void build(int n) {
          sz = 1;
          while(sz<n) {
              sz *= 2;
          }
          tree.resize(2*sz + 1, 0);
      }

      void clean()
      {
          for(int i=0; i<tree.size(); i++) {
              tree[i] = 0;
          }
      }

      void recSet(int idx, int lx, int rx, int i, int val) {
           if(rx-lx==1) {
               tree[idx] = val;
               return;
           }
           int mid = (lx+rx)/2;
           if(i<mid) {
               recSet(2*idx+1, lx, mid, i, val);
           } else
           {
               recSet(2*idx+2, mid, rx, i, val);
           }
           tree[idx] = max(tree[2*idx+1], tree[2*idx+2]);
      }

      void setX(int i, int val) {
          recSet(0, 0, sz, i, val);
      }

      int rec_range(int idx, int lx, int rx, int l, int r) {
          if(lx>=l&&rx<=r) {
              return tree[idx];
          }
          if(rx<=l||lx>=r) return 0;
          int mid = (lx+rx)/2;
          int left = rec_range(2*idx+1, lx, mid, l, r);
          int right = rec_range(2*idx+2, mid, rx, l, r);
          return max(left, right);
      }

      int range(int l, int r) {
          return rec_range(0, 0, sz, l, r);
      }
};


vector<int> dp;
seg mint, maxt;
map<int, int> ord;
vector<int> h;
int res = 0;
int center = -1;


void init2(int l, int r, int d)
{
    int n = h.size();
    res = 0;
    for(int i=0; i<=n; i++) {
        dp[i] = 0;
    }
    vector<int> used(n+1, 0);
    vector<int> nums;
    for(int i=l; i<=r; i++) {
        int f1 = 0, f2 = 0;
        nums.pub(h[i]);
        nums.pub(h[i]-d);
        nums.pub(h[i]+d);
        if(i>l) {
            if(h[i]>=h[i-1]) {
                f1 = 1;
            } else
            {
                f1 = 2;
            }
        }
        if(i<r) {
            if(h[i]>=h[i+1]) {
                f2 = 1;
            } else
            {
                f2 = 2;
            }
        }
        if(f1==0) {
            f1 = f2;
        }
        if(f2==0) {
            f2 = f1;
        }
        if(f1==f2) {
            used[i] = f1;
        }
    }
    sort(nums.begin(), nums.end());
    ord.clear();
    ord[nums[0]] = 0;
    int sz = nums.size();
    for(int i=1; i<sz; i++) {
        if(nums[i]>nums[i-1]) {
            ord[nums[i]] = ord[nums[i-1]] + 1;
        } else
        {
            ord[nums[i]] = ord[nums[i-1]];
        }
    }
    mint.clean();
    maxt.clean();
    mint.build(sz);
    maxt.build(sz);

    for(int i=r; i>=l; i--) {
        if(used[i]==0) {
            continue;
        }
        if(used[i]==1&&h[i]-d>0) {
            dp[i] = mint.range(0, ord[h[i]-d] + 1);
            maxt.setX(ord[h[i]], dp[i]);
        }
        if(used[i]==2) {
            dp[i] = 1 + maxt.range(ord[h[i]+d], sz);
            mint.setX(ord[h[i]], dp[i]);
        }
        res = max(res, dp[i]);
    }
}


void init(int n, vector<int> h2)
{
    h.resize(n);
    for(int i=0; i<n; i++) {
        h[i] = h2[i];
    }
    dp.resize(n+1);
    int idx = 1;
    while(idx<n&&h[idx]>=h[idx-1]) {
        idx++;
    }
    center = idx - 1;
    while(idx<n&&h[idx]<=h[idx-1]) {
        idx++;
    }
    if(idx!=n) {
        center = -1;
        init2(0, n - 1, 1);
    }
}

int max_towers(int l, int r, int d)
{
    if(center!=-1) {
        if(r<=center||l>=center) {
            return 1;
        }
        if(h[center]-h[l]>=d&&h[center]-h[r]>=d) {
            return 2;
        }
        return 1;
    }
    init2(l, r, d);
    if(l==0&&r==h.size()-1) {
        return res;
    }

    return res;
}

/*
4 0 3 20
0 1 2
1 2 3
18 1 19
*/

/*
int main()
{
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    //D(freopen("input.txt","r",stdin);)
    //D(freopen("ouput.txt","w",stdout);)
    int t = 1;
    //cin >> t;
    loop:
    while(t--)
    {
        int n;
        cin >> n;
        vector<int> a(n);
        for(int i=0; i<n; i++) {
            cin >> a[i];
        }
        init(n, a);
        int res = max_towers(1, 5, 10);
        if(res==0) {
            res = 1;
        }
        cout << res;
    }
    return 0;
}
*/

Compilation message

towers.cpp: In member function 'void seg::clean()':
towers.cpp:43:25: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   43 |           for(int i=0; i<tree.size(); i++) {
      |                        ~^~~~~~~~~~~~
towers.cpp: In function 'int max_towers(int, int, int)':
towers.cpp:199:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  199 |     if(l==0&&r==h.size()-1) {
      |              ~^~~~~~~~~~~~

Subtask #1
4.0 / 4.0

# 결과 실행 시간 메모리 Grader output
1 Correct 259 ms 1188 KB Output is correct
2 Correct 534 ms 1860 KB Output is correct
3 Correct 546 ms 1856 KB Output is correct
4 Correct 525 ms 2032 KB Output is correct
5 Correct 544 ms 1860 KB Output is correct
6 Correct 538 ms 1880 KB Output is correct
7 Correct 560 ms 1880 KB Output is correct
8 Correct 0 ms 344 KB Output is correct
9 Correct 0 ms 344 KB Output is correct
10 Correct 0 ms 344 KB Output is correct

Subtask #2
11.0 / 11.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 344 KB Output is correct
2 Correct 3 ms 1164 KB Output is correct
3 Correct 3 ms 856 KB Output is correct
4 Correct 3 ms 1064 KB Output is correct
5 Correct 3 ms 904 KB Output is correct
6 Correct 3 ms 856 KB Output is correct
7 Correct 3 ms 856 KB Output is correct
8 Correct 1 ms 344 KB Output is correct
9 Correct 0 ms 344 KB Output is correct
10 Correct 1 ms 856 KB Output is correct
11 Correct 1 ms 1108 KB Output is correct
12 Correct 0 ms 344 KB Output is correct
13 Correct 1 ms 596 KB Output is correct
14 Correct 0 ms 344 KB Output is correct
15 Correct 2 ms 804 KB Output is correct
16 Correct 3 ms 856 KB Output is correct
17 Correct 3 ms 856 KB Output is correct
18 Correct 0 ms 344 KB Output is correct
19 Correct 2 ms 856 KB Output is correct
20 Correct 3 ms 856 KB Output is correct
21 Correct 4 ms 856 KB Output is correct
22 Correct 4 ms 852 KB Output is correct
23 Correct 1 ms 344 KB Output is correct
24 Correct 2 ms 856 KB Output is correct
25 Correct 1 ms 600 KB Output is correct
26 Correct 3 ms 856 KB Output is correct
27 Correct 3 ms 932 KB Output is correct
28 Correct 4 ms 1112 KB Output is correct
29 Correct 4 ms 856 KB Output is correct
30 Correct 5 ms 932 KB Output is correct
31 Correct 3 ms 856 KB Output is correct
32 Correct 1 ms 344 KB Output is correct
33 Correct 1 ms 344 KB Output is correct
34 Correct 2 ms 856 KB Output is correct
35 Correct 2 ms 856 KB Output is correct

Subtask #3
12.0 / 12.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 344 KB Output is correct
2 Correct 3 ms 1164 KB Output is correct
3 Correct 3 ms 856 KB Output is correct
4 Correct 3 ms 1064 KB Output is correct
5 Correct 3 ms 904 KB Output is correct
6 Correct 3 ms 856 KB Output is correct
7 Correct 3 ms 856 KB Output is correct
8 Correct 1 ms 344 KB Output is correct
9 Correct 0 ms 344 KB Output is correct
10 Correct 1 ms 856 KB Output is correct
11 Correct 1 ms 1108 KB Output is correct
12 Correct 0 ms 344 KB Output is correct
13 Correct 1 ms 596 KB Output is correct
14 Correct 0 ms 344 KB Output is correct
15 Correct 2 ms 804 KB Output is correct
16 Correct 3 ms 856 KB Output is correct
17 Correct 3 ms 856 KB Output is correct
18 Correct 0 ms 344 KB Output is correct
19 Correct 2 ms 856 KB Output is correct
20 Correct 3 ms 856 KB Output is correct
21 Correct 4 ms 856 KB Output is correct
22 Correct 4 ms 852 KB Output is correct
23 Correct 1 ms 344 KB Output is correct
24 Correct 2 ms 856 KB Output is correct
25 Correct 1 ms 600 KB Output is correct
26 Correct 3 ms 856 KB Output is correct
27 Correct 3 ms 932 KB Output is correct
28 Correct 4 ms 1112 KB Output is correct
29 Correct 4 ms 856 KB Output is correct
30 Correct 5 ms 932 KB Output is correct
31 Correct 3 ms 856 KB Output is correct
32 Correct 1 ms 344 KB Output is correct
33 Correct 1 ms 344 KB Output is correct
34 Correct 2 ms 856 KB Output is correct
35 Correct 2 ms 856 KB Output is correct
36 Correct 127 ms 15656 KB Output is correct
37 Correct 221 ms 25940 KB Output is correct
38 Correct 183 ms 25948 KB Output is correct
39 Correct 240 ms 25756 KB Output is correct
40 Correct 228 ms 25724 KB Output is correct
41 Correct 328 ms 26140 KB Output is correct
42 Correct 207 ms 26048 KB Output is correct
43 Correct 13 ms 1856 KB Output is correct
44 Correct 9 ms 1860 KB Output is correct
45 Correct 106 ms 25796 KB Output is correct
46 Correct 88 ms 25748 KB Output is correct
47 Correct 204 ms 25872 KB Output is correct
48 Correct 211 ms 25700 KB Output is correct
49 Correct 198 ms 25704 KB Output is correct
50 Correct 9 ms 1852 KB Output is correct
51 Correct 110 ms 25792 KB Output is correct
52 Correct 313 ms 27328 KB Output is correct
53 Correct 362 ms 27612 KB Output is correct
54 Correct 378 ms 27380 KB Output is correct
55 Correct 8 ms 1860 KB Output is correct
56 Correct 163 ms 28676 KB Output is correct
57 Correct 308 ms 26920 KB Output is correct
58 Correct 333 ms 27532 KB Output is correct
59 Correct 334 ms 27392 KB Output is correct
60 Correct 398 ms 27748 KB Output is correct
61 Correct 401 ms 27492 KB Output is correct
62 Correct 387 ms 27532 KB Output is correct
63 Correct 379 ms 28404 KB Output is correct
64 Correct 9 ms 1856 KB Output is correct
65 Correct 9 ms 1856 KB Output is correct
66 Correct 167 ms 27472 KB Output is correct
67 Correct 164 ms 27504 KB Output is correct

Subtask #4
0 / 14.0

# 결과 실행 시간 메모리 Grader output
1 Execution timed out 4077 ms 26252 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #5
0 / 17.0

# 결과 실행 시간 메모리 Grader output
1 Execution timed out 4032 ms 7684 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #6
0 / 19.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 344 KB Output is correct
2 Correct 3 ms 1164 KB Output is correct
3 Correct 3 ms 856 KB Output is correct
4 Correct 3 ms 1064 KB Output is correct
5 Correct 3 ms 904 KB Output is correct
6 Correct 3 ms 856 KB Output is correct
7 Correct 3 ms 856 KB Output is correct
8 Correct 1 ms 344 KB Output is correct
9 Correct 0 ms 344 KB Output is correct
10 Correct 1 ms 856 KB Output is correct
11 Correct 1 ms 1108 KB Output is correct
12 Correct 0 ms 344 KB Output is correct
13 Correct 1 ms 596 KB Output is correct
14 Correct 0 ms 344 KB Output is correct
15 Correct 2 ms 804 KB Output is correct
16 Correct 3 ms 856 KB Output is correct
17 Correct 3 ms 856 KB Output is correct
18 Correct 0 ms 344 KB Output is correct
19 Correct 2 ms 856 KB Output is correct
20 Correct 3 ms 856 KB Output is correct
21 Correct 4 ms 856 KB Output is correct
22 Correct 4 ms 852 KB Output is correct
23 Correct 1 ms 344 KB Output is correct
24 Correct 2 ms 856 KB Output is correct
25 Correct 1 ms 600 KB Output is correct
26 Correct 3 ms 856 KB Output is correct
27 Correct 3 ms 932 KB Output is correct
28 Correct 4 ms 1112 KB Output is correct
29 Correct 4 ms 856 KB Output is correct
30 Correct 5 ms 932 KB Output is correct
31 Correct 3 ms 856 KB Output is correct
32 Correct 1 ms 344 KB Output is correct
33 Correct 1 ms 344 KB Output is correct
34 Correct 2 ms 856 KB Output is correct
35 Correct 2 ms 856 KB Output is correct
36 Correct 127 ms 15656 KB Output is correct
37 Correct 221 ms 25940 KB Output is correct
38 Correct 183 ms 25948 KB Output is correct
39 Correct 240 ms 25756 KB Output is correct
40 Correct 228 ms 25724 KB Output is correct
41 Correct 328 ms 26140 KB Output is correct
42 Correct 207 ms 26048 KB Output is correct
43 Correct 13 ms 1856 KB Output is correct
44 Correct 9 ms 1860 KB Output is correct
45 Correct 106 ms 25796 KB Output is correct
46 Correct 88 ms 25748 KB Output is correct
47 Correct 204 ms 25872 KB Output is correct
48 Correct 211 ms 25700 KB Output is correct
49 Correct 198 ms 25704 KB Output is correct
50 Correct 9 ms 1852 KB Output is correct
51 Correct 110 ms 25792 KB Output is correct
52 Correct 313 ms 27328 KB Output is correct
53 Correct 362 ms 27612 KB Output is correct
54 Correct 378 ms 27380 KB Output is correct
55 Correct 8 ms 1860 KB Output is correct
56 Correct 163 ms 28676 KB Output is correct
57 Correct 308 ms 26920 KB Output is correct
58 Correct 333 ms 27532 KB Output is correct
59 Correct 334 ms 27392 KB Output is correct
60 Correct 398 ms 27748 KB Output is correct
61 Correct 401 ms 27492 KB Output is correct
62 Correct 387 ms 27532 KB Output is correct
63 Correct 379 ms 28404 KB Output is correct
64 Correct 9 ms 1856 KB Output is correct
65 Correct 9 ms 1856 KB Output is correct
66 Correct 167 ms 27472 KB Output is correct
67 Correct 164 ms 27504 KB Output is correct
68 Execution timed out 4077 ms 26252 KB Time limit exceeded
69 Halted 0 ms 0 KB -

Subtask #7
0 / 23.0

# 결과 실행 시간 메모리 Grader output
1 Correct 259 ms 1188 KB Output is correct
2 Correct 534 ms 1860 KB Output is correct
3 Correct 546 ms 1856 KB Output is correct
4 Correct 525 ms 2032 KB Output is correct
5 Correct 544 ms 1860 KB Output is correct
6 Correct 538 ms 1880 KB Output is correct
7 Correct 560 ms 1880 KB Output is correct
8 Correct 0 ms 344 KB Output is correct
9 Correct 0 ms 344 KB Output is correct
10 Correct 0 ms 344 KB Output is correct
11 Correct 1 ms 344 KB Output is correct
12 Correct 3 ms 1164 KB Output is correct
13 Correct 3 ms 856 KB Output is correct
14 Correct 3 ms 1064 KB Output is correct
15 Correct 3 ms 904 KB Output is correct
16 Correct 3 ms 856 KB Output is correct
17 Correct 3 ms 856 KB Output is correct
18 Correct 1 ms 344 KB Output is correct
19 Correct 0 ms 344 KB Output is correct
20 Correct 1 ms 856 KB Output is correct
21 Correct 1 ms 1108 KB Output is correct
22 Correct 0 ms 344 KB Output is correct
23 Correct 1 ms 596 KB Output is correct
24 Correct 0 ms 344 KB Output is correct
25 Correct 2 ms 804 KB Output is correct
26 Correct 3 ms 856 KB Output is correct
27 Correct 3 ms 856 KB Output is correct
28 Correct 0 ms 344 KB Output is correct
29 Correct 2 ms 856 KB Output is correct
30 Correct 3 ms 856 KB Output is correct
31 Correct 4 ms 856 KB Output is correct
32 Correct 4 ms 852 KB Output is correct
33 Correct 1 ms 344 KB Output is correct
34 Correct 2 ms 856 KB Output is correct
35 Correct 1 ms 600 KB Output is correct
36 Correct 3 ms 856 KB Output is correct
37 Correct 3 ms 932 KB Output is correct
38 Correct 4 ms 1112 KB Output is correct
39 Correct 4 ms 856 KB Output is correct
40 Correct 5 ms 932 KB Output is correct
41 Correct 3 ms 856 KB Output is correct
42 Correct 1 ms 344 KB Output is correct
43 Correct 1 ms 344 KB Output is correct
44 Correct 2 ms 856 KB Output is correct
45 Correct 2 ms 856 KB Output is correct
46 Correct 127 ms 15656 KB Output is correct
47 Correct 221 ms 25940 KB Output is correct
48 Correct 183 ms 25948 KB Output is correct
49 Correct 240 ms 25756 KB Output is correct
50 Correct 228 ms 25724 KB Output is correct
51 Correct 328 ms 26140 KB Output is correct
52 Correct 207 ms 26048 KB Output is correct
53 Correct 13 ms 1856 KB Output is correct
54 Correct 9 ms 1860 KB Output is correct
55 Correct 106 ms 25796 KB Output is correct
56 Correct 88 ms 25748 KB Output is correct
57 Correct 204 ms 25872 KB Output is correct
58 Correct 211 ms 25700 KB Output is correct
59 Correct 198 ms 25704 KB Output is correct
60 Correct 9 ms 1852 KB Output is correct
61 Correct 110 ms 25792 KB Output is correct
62 Correct 313 ms 27328 KB Output is correct
63 Correct 362 ms 27612 KB Output is correct
64 Correct 378 ms 27380 KB Output is correct
65 Correct 8 ms 1860 KB Output is correct
66 Correct 163 ms 28676 KB Output is correct
67 Correct 308 ms 26920 KB Output is correct
68 Correct 333 ms 27532 KB Output is correct
69 Correct 334 ms 27392 KB Output is correct
70 Correct 398 ms 27748 KB Output is correct
71 Correct 401 ms 27492 KB Output is correct
72 Correct 387 ms 27532 KB Output is correct
73 Correct 379 ms 28404 KB Output is correct
74 Correct 9 ms 1856 KB Output is correct
75 Correct 9 ms 1856 KB Output is correct
76 Correct 167 ms 27472 KB Output is correct
77 Correct 164 ms 27504 KB Output is correct
78 Execution timed out 4077 ms 26252 KB Time limit exceeded
79 Halted 0 ms 0 KB -