oj.uz

Submission #334538

# Submission time Handle Problem Language Result Execution time Memory
334538 2020-12-09T11:00:41 Z Pety Divide and conquer (IZhO14_divide) C++14
100 / 100
 127 ms 5996 KB 
#include <bits/stdc++.h>

using namespace std;

int n;
int x[100002];
long long g[100002], d[100002], mn[100002];

int cb (int i, long long val) {
  int st = 1, dr = i, ans;
  while (st <= dr) {
    int mij = (st + dr) / 2;
    if (mn[mij] <= val) {
      dr = mij - 1;
      ans = mij;
    }
    else
      st = mij + 1;
  }
  return ans;
}

int main()
{
  cin >> n;
  for (int i = 1; i <= n; i++)
    cin >> x[i] >> g[i] >> d[i];
  long long ans = 0;
  mn[0] = 1e18;
  for (int i = 1; i  <= n; i++) {
    g[i] += g[i - 1];
    d[i] += d[i - 1];
    mn[i] = min(d[i - 1] - x[i], mn[i - 1]);
    int poz = cb(i, d[i] - x[i]);
    ans = max(ans, g[i] - g[poz - 1]);
  }
  ///sum[i] - sum[j - 1] - x[i] + x[j] >= 0
  ///sum[i] - x[i] >= sum[j - 1] - x[j]
  cout << ans;
  return 0;
}

Compilation message

divide.cpp: In function 'int cb(int, long long int)':
divide.cpp:20:10: warning: 'ans' may be used uninitialized in this function [-Wmaybe-uninitialized]
   20 |   return ans;
      |          ^~~
divide.cpp: In function 'int main()':
divide.cpp:35:33: warning: 'ans' may be used uninitialized in this function [-Wmaybe-uninitialized]
   35 |     ans = max(ans, g[i] - g[poz - 1]);
      |                             ~~~~^~~

Subtask #1
17.0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 364 KB Output is correct
2 Correct 1 ms 364 KB Output is correct
3 Correct 1 ms 364 KB Output is correct
4 Correct 1 ms 364 KB Output is correct
5 Correct 1 ms 364 KB Output is correct
6 Correct 1 ms 364 KB Output is correct
7 Correct 1 ms 364 KB Output is correct
8 Correct 1 ms 364 KB Output is correct
9 Correct 1 ms 364 KB Output is correct
10 Correct 1 ms 364 KB Output is correct
11 Correct 1 ms 364 KB Output is correct
12 Correct 1 ms 364 KB Output is correct

Subtask #2
31.0 / 31.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 364 KB Output is correct
2 Correct 1 ms 364 KB Output is correct
3 Correct 1 ms 364 KB Output is correct
4 Correct 1 ms 364 KB Output is correct
5 Correct 1 ms 364 KB Output is correct
6 Correct 1 ms 364 KB Output is correct
7 Correct 1 ms 364 KB Output is correct
8 Correct 1 ms 364 KB Output is correct
9 Correct 1 ms 364 KB Output is correct
10 Correct 1 ms 364 KB Output is correct
11 Correct 1 ms 364 KB Output is correct
12 Correct 1 ms 364 KB Output is correct
13 Correct 1 ms 364 KB Output is correct
14 Correct 1 ms 364 KB Output is correct
15 Correct 1 ms 364 KB Output is correct
16 Correct 1 ms 364 KB Output is correct
17 Correct 2 ms 364 KB Output is correct
18 Correct 2 ms 364 KB Output is correct
19 Correct 1 ms 364 KB Output is correct
20 Correct 2 ms 384 KB Output is correct
21 Correct 2 ms 364 KB Output is correct
22 Correct 2 ms 364 KB Output is correct
23 Correct 6 ms 620 KB Output is correct
24 Correct 6 ms 620 KB Output is correct

Subtask #3
52.0 / 52.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 364 KB Output is correct
2 Correct 1 ms 364 KB Output is correct
3 Correct 1 ms 364 KB Output is correct
4 Correct 1 ms 364 KB Output is correct
5 Correct 1 ms 364 KB Output is correct
6 Correct 1 ms 364 KB Output is correct
7 Correct 1 ms 364 KB Output is correct
8 Correct 1 ms 364 KB Output is correct
9 Correct 1 ms 364 KB Output is correct
10 Correct 1 ms 364 KB Output is correct
11 Correct 1 ms 364 KB Output is correct
12 Correct 1 ms 364 KB Output is correct
13 Correct 1 ms 364 KB Output is correct
14 Correct 1 ms 364 KB Output is correct
15 Correct 1 ms 364 KB Output is correct
16 Correct 1 ms 364 KB Output is correct
17 Correct 2 ms 364 KB Output is correct
18 Correct 2 ms 364 KB Output is correct
19 Correct 1 ms 364 KB Output is correct
20 Correct 2 ms 384 KB Output is correct
21 Correct 2 ms 364 KB Output is correct
22 Correct 2 ms 364 KB Output is correct
23 Correct 6 ms 620 KB Output is correct
24 Correct 6 ms 620 KB Output is correct
25 Correct 4 ms 492 KB Output is correct
26 Correct 8 ms 748 KB Output is correct
27 Correct 10 ms 748 KB Output is correct
28 Correct 50 ms 2668 KB Output is correct
29 Correct 59 ms 3052 KB Output is correct
30 Correct 127 ms 5996 KB Output is correct
31 Correct 90 ms 4844 KB Output is correct
32 Correct 93 ms 4844 KB Output is correct
33 Correct 89 ms 4716 KB Output is correct
34 Correct 90 ms 4716 KB Output is correct
35 Correct 104 ms 5228 KB Output is correct
36 Correct 124 ms 5356 KB Output is correct