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Submission #197445

# Submission time Handle Problem Language Result Execution time Memory
197445 2020-01-21T09:03:02 Z quocnguyen1012 Lightning Rod (NOI18_lightningrod) C++14
80 / 100
 2000 ms 156648 KB 
#include <bits/stdc++.h>

int hmt() {int x=0;int c=getchar(),n=0;for(;!isdigit(c);c=getchar()) n=(c=='-');for(;isdigit(c);c=getchar()) x=x*10+c-'0';if(n) x=-x;return x;}
#define in hmt()
#define fi first
#define se second
#define mp make_pair
#define pb push_back

using namespace std;
typedef long long ll;

signed main(void)
{
  ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
  if (fopen("A.INP", "r")){
    freopen("A.INP", "r", stdin);
    freopen("A.OUT", "w", stdout);
  }
  int N = in;
  vector<pair<int, int>> ST;
  while (N--){
    int x = in, y = in;
    bool ok = 1;
    while (ST.size()){
      auto now = ST.back();
      if (x - now.fi <= now.se - y){
        ok = false;
        break;
      }
      else if (x - now.fi <= y - now.se){
        ST.pop_back();
      }
      else break;
    }
    if (ok){
      ST.pb(mp(x, y));
    }
  }
  cout << (int)ST.size() << '\n';
}

Compilation message

lightningrod.cpp: In function 'int main()':
lightningrod.cpp:17:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
     freopen("A.INP", "r", stdin);
     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~
lightningrod.cpp:18:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
     freopen("A.OUT", "w", stdout);
     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~

Subtask #1
4.0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 1832 ms 156556 KB Output is correct
2 Correct 1830 ms 156648 KB Output is correct
3 Correct 1789 ms 156260 KB Output is correct

Subtask #2
7.0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 248 KB Output is correct
2 Correct 2 ms 376 KB Output is correct
3 Correct 2 ms 376 KB Output is correct
4 Correct 4 ms 376 KB Output is correct
5 Correct 1 ms 376 KB Output is correct
6 Correct 2 ms 376 KB Output is correct
7 Correct 2 ms 504 KB Output is correct

Subtask #3
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 248 KB Output is correct
2 Correct 2 ms 376 KB Output is correct
3 Correct 2 ms 376 KB Output is correct
4 Correct 4 ms 376 KB Output is correct
5 Correct 1 ms 376 KB Output is correct
6 Correct 2 ms 376 KB Output is correct
7 Correct 2 ms 504 KB Output is correct
8 Correct 2 ms 376 KB Output is correct
9 Correct 2 ms 376 KB Output is correct
10 Correct 6 ms 352 KB Output is correct

Subtask #4
21.0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 248 KB Output is correct
2 Correct 2 ms 376 KB Output is correct
3 Correct 2 ms 376 KB Output is correct
4 Correct 4 ms 376 KB Output is correct
5 Correct 1 ms 376 KB Output is correct
6 Correct 2 ms 376 KB Output is correct
7 Correct 2 ms 504 KB Output is correct
8 Correct 2 ms 376 KB Output is correct
9 Correct 2 ms 376 KB Output is correct
10 Correct 6 ms 352 KB Output is correct
11 Correct 3 ms 376 KB Output is correct
12 Correct 3 ms 376 KB Output is correct
13 Correct 2 ms 376 KB Output is correct

Subtask #5
26.0 / 26.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 248 KB Output is correct
2 Correct 2 ms 376 KB Output is correct
3 Correct 2 ms 376 KB Output is correct
4 Correct 4 ms 376 KB Output is correct
5 Correct 1 ms 376 KB Output is correct
6 Correct 2 ms 376 KB Output is correct
7 Correct 2 ms 504 KB Output is correct
8 Correct 2 ms 376 KB Output is correct
9 Correct 2 ms 376 KB Output is correct
10 Correct 6 ms 352 KB Output is correct
11 Correct 3 ms 376 KB Output is correct
12 Correct 3 ms 376 KB Output is correct
13 Correct 2 ms 376 KB Output is correct
14 Correct 57 ms 3960 KB Output is correct
15 Correct 54 ms 3636 KB Output is correct
16 Correct 49 ms 3980 KB Output is correct

Subtask #6
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1567 ms 92072 KB Output is correct
2 Correct 1569 ms 87340 KB Output is correct
3 Correct 1547 ms 82740 KB Output is correct

Subtask #7
0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 1832 ms 156556 KB Output is correct
2 Correct 1830 ms 156648 KB Output is correct
3 Correct 1789 ms 156260 KB Output is correct
4 Correct 2 ms 248 KB Output is correct
5 Correct 2 ms 376 KB Output is correct
6 Correct 2 ms 376 KB Output is correct
7 Correct 4 ms 376 KB Output is correct
8 Correct 1 ms 376 KB Output is correct
9 Correct 2 ms 376 KB Output is correct
10 Correct 2 ms 504 KB Output is correct
11 Correct 2 ms 376 KB Output is correct
12 Correct 2 ms 376 KB Output is correct
13 Correct 6 ms 352 KB Output is correct
14 Correct 3 ms 376 KB Output is correct
15 Correct 3 ms 376 KB Output is correct
16 Correct 2 ms 376 KB Output is correct
17 Correct 57 ms 3960 KB Output is correct
18 Correct 54 ms 3636 KB Output is correct
19 Correct 49 ms 3980 KB Output is correct
20 Correct 1567 ms 92072 KB Output is correct
21 Correct 1569 ms 87340 KB Output is correct
22 Correct 1547 ms 82740 KB Output is correct
23 Execution timed out 2075 ms 17784 KB Time limit exceeded
24 Halted 0 ms 0 KB -