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Submission #502441

# Submission time Handle Problem Language Result Execution time Memory
502441 2022-01-06T02:43:49 Z chenwz Mobile (BOI12_mobile) C++11
100 / 100
 372 ms 24604 KB 
// BalticOI2012 - Mobile
#include <bits/stdc++.h>
using namespace std;
using LL = long long;
#define _for(i, a, b) for (int i = (a); i < (int)(b); ++i)
int main() {
  int N, L;
  scanf("%d%d", &N, &L);
  vector<int> X(N), Y(N);
  _for(i, 0, N) scanf("%d%d", &X[i], &Y[i]);
  double l = 1, r = 1.5e9;
  while (r - l > 1e-3) {
    double m = (l + r) / 2, right = 0;
    _for(i, 0, N) {
      double y = Y[i], dx = sqrt(m * m - y * y), a = X[i] - dx, b = X[i] + dx;
      if (a <= right) right = max(right, b);
      if (right >= L) break;
    }
    (right >= L ? r : l) = m;
  }
  printf("%.4lf\n", l);
  return 0;
}
// 499716 Mobile (BOI12_mobile) C++11 100 / 100 405ms  27384KB

Compilation message

mobile.cpp: In function 'int main()':
mobile.cpp:8:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
    8 |   scanf("%d%d", &N, &L);
      |   ~~~~~^~~~~~~~~~~~~~~~
mobile.cpp:10:22: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   10 |   _for(i, 0, N) scanf("%d%d", &X[i], &Y[i]);
      |                 ~~~~~^~~~~~~~~~~~~~~~~~~~~~

Subtask #1
4.0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 1 ms 292 KB Output is correct
3 Correct 0 ms 292 KB Output is correct
4 Correct 0 ms 204 KB Output is correct

Subtask #2
4.0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 204 KB Output is correct
2 Correct 0 ms 204 KB Output is correct
3 Correct 0 ms 204 KB Output is correct
4 Correct 1 ms 272 KB Output is correct

Subtask #3
4.0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 332 KB Output is correct
2 Correct 1 ms 300 KB Output is correct
3 Correct 2 ms 204 KB Output is correct
4 Correct 1 ms 348 KB Output is correct

Subtask #4
4.0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 332 KB Output is correct
2 Correct 2 ms 304 KB Output is correct
3 Correct 1 ms 332 KB Output is correct
4 Correct 2 ms 332 KB Output is correct

Subtask #5
4.0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 300 KB Output is correct
2 Correct 2 ms 284 KB Output is correct
3 Correct 2 ms 360 KB Output is correct
4 Correct 3 ms 332 KB Output is correct

Subtask #6
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 332 KB Output is correct
2 Correct 2 ms 304 KB Output is correct
3 Correct 2 ms 368 KB Output is correct
4 Correct 2 ms 332 KB Output is correct
5 Correct 2 ms 332 KB Output is correct

Subtask #7
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 25 ms 1632 KB Output is correct
2 Correct 17 ms 1888 KB Output is correct
3 Correct 17 ms 1320 KB Output is correct
4 Correct 27 ms 2004 KB Output is correct
5 Correct 11 ms 1064 KB Output is correct

Subtask #8
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 20 ms 1520 KB Output is correct
2 Correct 20 ms 1636 KB Output is correct
3 Correct 24 ms 1952 KB Output is correct
4 Correct 27 ms 2056 KB Output is correct
5 Correct 34 ms 2368 KB Output is correct

Subtask #9
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 22 ms 1588 KB Output is correct
2 Correct 19 ms 2112 KB Output is correct
3 Correct 23 ms 1832 KB Output is correct
4 Correct 52 ms 2968 KB Output is correct
5 Correct 25 ms 1904 KB Output is correct

Subtask #10
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 24 ms 2584 KB Output is correct
2 Correct 24 ms 2380 KB Output is correct
3 Correct 23 ms 2084 KB Output is correct
4 Correct 39 ms 2968 KB Output is correct
5 Correct 44 ms 2324 KB Output is correct

Subtask #11
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 30 ms 2476 KB Output is correct
2 Correct 22 ms 2460 KB Output is correct
3 Correct 22 ms 2092 KB Output is correct
4 Correct 50 ms 2988 KB Output is correct
5 Correct 30 ms 2252 KB Output is correct

Subtask #12
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 130 ms 8408 KB Output is correct
2 Correct 121 ms 11844 KB Output is correct
3 Correct 115 ms 11344 KB Output is correct
4 Correct 188 ms 13756 KB Output is correct
5 Correct 150 ms 10964 KB Output is correct

Subtask #13
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 123 ms 12376 KB Output is correct
2 Correct 198 ms 10800 KB Output is correct
3 Correct 120 ms 9940 KB Output is correct
4 Correct 186 ms 13524 KB Output is correct
5 Correct 157 ms 11588 KB Output is correct

Subtask #14
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 149 ms 10024 KB Output is correct
2 Correct 154 ms 14184 KB Output is correct
3 Correct 128 ms 13664 KB Output is correct
4 Correct 237 ms 16864 KB Output is correct
5 Correct 177 ms 12968 KB Output is correct

Subtask #15
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 142 ms 14828 KB Output is correct
2 Correct 237 ms 12996 KB Output is correct
3 Correct 133 ms 11804 KB Output is correct
4 Correct 221 ms 16608 KB Output is correct
5 Correct 183 ms 13804 KB Output is correct

Subtask #16
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 175 ms 11808 KB Output is correct
2 Correct 160 ms 16580 KB Output is correct
3 Correct 149 ms 15908 KB Output is correct
4 Correct 261 ms 19204 KB Output is correct
5 Correct 199 ms 14716 KB Output is correct

Subtask #17
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 162 ms 17268 KB Output is correct
2 Correct 275 ms 15000 KB Output is correct
3 Correct 190 ms 14068 KB Output is correct
4 Correct 277 ms 19060 KB Output is correct
5 Correct 207 ms 15812 KB Output is correct

Subtask #18
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 226 ms 13476 KB Output is correct
2 Correct 188 ms 18948 KB Output is correct
3 Correct 183 ms 18052 KB Output is correct
4 Correct 295 ms 22148 KB Output is correct
5 Correct 241 ms 17664 KB Output is correct

Subtask #19
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 209 ms 19844 KB Output is correct
2 Correct 304 ms 17024 KB Output is correct
3 Correct 182 ms 16068 KB Output is correct
4 Correct 295 ms 21956 KB Output is correct
5 Correct 242 ms 18088 KB Output is correct

Subtask #20
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 253 ms 16836 KB Output is correct
2 Correct 204 ms 23596 KB Output is correct
3 Correct 229 ms 22556 KB Output is correct
4 Correct 370 ms 9540 KB Output is correct
5 Correct 301 ms 21684 KB Output is correct

Subtask #21
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 249 ms 24604 KB Output is correct
2 Correct 367 ms 21188 KB Output is correct
3 Correct 219 ms 20260 KB Output is correct
4 Correct 372 ms 9500 KB Output is correct
5 Correct 313 ms 22816 KB Output is correct