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Submission #499716

# Submission time Handle Problem Language Result Execution time Memory
499716 2021-12-29T10:07:25 Z chenwz Mobile (BOI12_mobile) C++11
100 / 100
 405 ms 27384 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)
const int NN = 1e6 + 4;
int X[NN], Y[NN];
int main() {
  int N, L;
  scanf("%d%d", &N, &L);
  _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, curr = 0;
    _for(i, 0, N) {
      double x = X[i], y = Y[i], delta = sqrt(m * m - y * y), a = x - delta,
             b = x + delta;
      if (a <= curr) curr = max(curr, b);
      if(curr >= L) break;
    }
    (curr >= L ? r : l) = m;
  }
  printf("%.4lf\n", l);
  return 0;
}

Compilation message

mobile.cpp: In function 'int main()':
mobile.cpp:10:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   10 |   scanf("%d%d", &N, &L);
      |   ~~~~~^~~~~~~~~~~~~~~~
mobile.cpp:11:22: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   11 |   _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 332 KB Output is correct
2 Correct 0 ms 308 KB Output is correct
3 Correct 0 ms 204 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 296 KB Output is correct
2 Correct 1 ms 300 KB Output is correct
3 Correct 0 ms 204 KB Output is correct
4 Correct 0 ms 204 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 340 KB Output is correct
3 Correct 1 ms 332 KB Output is correct
4 Correct 1 ms 344 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 1 ms 332 KB Output is correct
3 Correct 1 ms 312 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 312 KB Output is correct
2 Correct 1 ms 312 KB Output is correct
3 Correct 1 ms 332 KB Output is correct
4 Correct 2 ms 312 KB Output is correct

Subtask #6
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 312 KB Output is correct
2 Correct 2 ms 332 KB Output is correct
3 Correct 2 ms 380 KB Output is correct
4 Correct 2 ms 332 KB Output is correct
5 Correct 2 ms 304 KB Output is correct

Subtask #7
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 24 ms 1560 KB Output is correct
2 Correct 17 ms 1968 KB Output is correct
3 Correct 12 ms 1252 KB Output is correct
4 Correct 24 ms 2048 KB Output is correct
5 Correct 11 ms 1056 KB Output is correct

Subtask #8
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 19 ms 1568 KB Output is correct
2 Correct 20 ms 1732 KB Output is correct
3 Correct 23 ms 1952 KB Output is correct
4 Correct 25 ms 2012 KB Output is correct
5 Correct 30 ms 2416 KB Output is correct

Subtask #9
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 22 ms 1704 KB Output is correct
2 Correct 19 ms 1988 KB Output is correct
3 Correct 18 ms 1864 KB Output is correct
4 Correct 37 ms 3016 KB Output is correct
5 Correct 24 ms 1816 KB Output is correct

Subtask #10
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 27 ms 2628 KB Output is correct
2 Correct 23 ms 2396 KB Output is correct
3 Correct 22 ms 1988 KB Output is correct
4 Correct 39 ms 2992 KB Output is correct
5 Correct 29 ms 2244 KB Output is correct

Subtask #11
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 29 ms 2528 KB Output is correct
2 Correct 22 ms 2372 KB Output is correct
3 Correct 20 ms 2092 KB Output is correct
4 Correct 37 ms 3004 KB Output is correct
5 Correct 29 ms 2356 KB Output is correct

Subtask #12
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 121 ms 8468 KB Output is correct
2 Correct 118 ms 11844 KB Output is correct
3 Correct 112 ms 11368 KB Output is correct
4 Correct 179 ms 13756 KB Output is correct
5 Correct 149 ms 10996 KB Output is correct

Subtask #13
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 120 ms 12380 KB Output is correct
2 Correct 193 ms 10808 KB Output is correct
3 Correct 113 ms 9864 KB Output is correct
4 Correct 188 ms 13572 KB Output is correct
5 Correct 152 ms 11464 KB Output is correct

Subtask #14
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 151 ms 10104 KB Output is correct
2 Correct 130 ms 14252 KB Output is correct
3 Correct 151 ms 13792 KB Output is correct
4 Correct 265 ms 16844 KB Output is correct
5 Correct 182 ms 12984 KB Output is correct

Subtask #15
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 144 ms 14856 KB Output is correct
2 Correct 224 ms 12896 KB Output is correct
3 Correct 127 ms 11708 KB Output is correct
4 Correct 238 ms 16788 KB Output is correct
5 Correct 185 ms 13716 KB Output is correct

Subtask #16
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 167 ms 11804 KB Output is correct
2 Correct 170 ms 16572 KB Output is correct
3 Correct 144 ms 15912 KB Output is correct
4 Correct 260 ms 19288 KB Output is correct
5 Correct 224 ms 14740 KB Output is correct

Subtask #17
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 160 ms 17292 KB Output is correct
2 Correct 256 ms 15140 KB Output is correct
3 Correct 165 ms 14040 KB Output is correct
4 Correct 254 ms 19204 KB Output is correct
5 Correct 213 ms 15900 KB Output is correct

Subtask #18
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 206 ms 13600 KB Output is correct
2 Correct 197 ms 18892 KB Output is correct
3 Correct 181 ms 18252 KB Output is correct
4 Correct 319 ms 22224 KB Output is correct
5 Correct 234 ms 17604 KB Output is correct

Subtask #19
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 191 ms 19644 KB Output is correct
2 Correct 292 ms 17008 KB Output is correct
3 Correct 186 ms 16020 KB Output is correct
4 Correct 298 ms 22116 KB Output is correct
5 Correct 239 ms 18200 KB Output is correct

Subtask #20
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 235 ms 16824 KB Output is correct
2 Correct 197 ms 23652 KB Output is correct
3 Correct 232 ms 22796 KB Output is correct
4 Correct 405 ms 27300 KB Output is correct
5 Correct 342 ms 21716 KB Output is correct

Subtask #21
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 248 ms 24632 KB Output is correct
2 Correct 357 ms 21444 KB Output is correct
3 Correct 214 ms 20364 KB Output is correct
4 Correct 367 ms 27384 KB Output is correct
5 Correct 312 ms 22908 KB Output is correct