oj.uz

Submission #374762

# Submission time Handle Problem Language Result Execution time Memory
374762 2021-03-08T05:59:31 Z wzy Mobile (BOI12_mobile) C++17
100 / 100
 668 ms 27628 KB 
#include <bits/stdc++.h>
using namespace std;
const int N = 1000005;
int n , L;
pair<int,int> v[N];

double f(double mid){
	double cur = 0.00;
	for(int i = 1 ; i <= n; i ++){
		double len = sqrt(mid*mid - 1.00 * (1ll * v[i].second)* (1ll * v[i].second));
		if(cur >= (1.00 * v[i].first - len))
			cur = max(cur , 1.00*v[i].first + len);
	}
	return cur >= L;
}

int32_t main(){
	scanf("%d%d" , &n , &L);
	for(int i = 1; i <= n; i ++){
		scanf("%d%d" , &v[i].first , &v[i].second);
	}
	sort(v + 1 , v + 1 + n);
	double l = 0.000 , r = 4e9;
	while(r-l > 1e-6){
		double mid = l + (r-l)/2;
		if(f(mid))
			r = mid;
		else
			l = mid;
	}
	printf("%.6lF" , l);
}

Compilation message

mobile.cpp: In function 'int32_t main()':
mobile.cpp:18:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   18 |  scanf("%d%d" , &n , &L);
      |  ~~~~~^~~~~~~~~~~~~~~~~~
mobile.cpp:20:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   20 |   scanf("%d%d" , &v[i].first , &v[i].second);
      |   ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
4.0 / 4.0

# 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 0 ms 364 KB Output is correct
4 Correct 1 ms 364 KB Output is correct

Subtask #2
4.0 / 4.0

# 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

Subtask #3
4.0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 364 KB Output is correct
2 Correct 2 ms 364 KB Output is correct
3 Correct 2 ms 364 KB Output is correct
4 Correct 2 ms 364 KB Output is correct

Subtask #4
4.0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 492 KB Output is correct
2 Correct 3 ms 364 KB Output is correct
3 Correct 4 ms 492 KB Output is correct
4 Correct 4 ms 492 KB Output is correct

Subtask #5
4.0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 364 KB Output is correct
2 Correct 3 ms 364 KB Output is correct
3 Correct 3 ms 364 KB Output is correct
4 Correct 4 ms 492 KB Output is correct

Subtask #6
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 364 KB Output is correct
2 Correct 3 ms 364 KB Output is correct
3 Correct 3 ms 364 KB Output is correct
4 Correct 4 ms 492 KB Output is correct
5 Correct 3 ms 364 KB Output is correct

Subtask #7
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 47 ms 876 KB Output is correct
2 Correct 44 ms 1004 KB Output is correct
3 Correct 27 ms 1388 KB Output is correct
4 Correct 51 ms 2156 KB Output is correct
5 Correct 28 ms 1132 KB Output is correct

Subtask #8
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 43 ms 876 KB Output is correct
2 Correct 41 ms 876 KB Output is correct
3 Correct 47 ms 1132 KB Output is correct
4 Correct 51 ms 1004 KB Output is correct
5 Correct 55 ms 1056 KB Output is correct

Subtask #9
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 39 ms 1004 KB Output is correct
2 Correct 40 ms 1004 KB Output is correct
3 Correct 42 ms 1900 KB Output is correct
4 Correct 71 ms 3180 KB Output is correct
5 Correct 54 ms 2028 KB Output is correct

Subtask #10
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 47 ms 1132 KB Output is correct
2 Correct 47 ms 2544 KB Output is correct
3 Correct 50 ms 2156 KB Output is correct
4 Correct 69 ms 3328 KB Output is correct
5 Correct 61 ms 2412 KB Output is correct

Subtask #11
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 47 ms 1132 KB Output is correct
2 Correct 47 ms 1132 KB Output is correct
3 Correct 48 ms 2156 KB Output is correct
4 Correct 68 ms 3052 KB Output is correct
5 Correct 60 ms 2412 KB Output is correct

Subtask #12
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 229 ms 4204 KB Output is correct
2 Correct 244 ms 12012 KB Output is correct
3 Correct 240 ms 11520 KB Output is correct
4 Correct 333 ms 13804 KB Output is correct
5 Correct 309 ms 11244 KB Output is correct

Subtask #13
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 243 ms 4204 KB Output is correct
2 Correct 348 ms 10860 KB Output is correct
3 Correct 246 ms 10092 KB Output is correct
4 Correct 325 ms 13548 KB Output is correct
5 Correct 327 ms 11776 KB Output is correct

Subtask #14
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 266 ms 5160 KB Output is correct
2 Correct 303 ms 14332 KB Output is correct
3 Correct 294 ms 13792 KB Output is correct
4 Correct 402 ms 17004 KB Output is correct
5 Correct 360 ms 13036 KB Output is correct

Subtask #15
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 295 ms 4992 KB Output is correct
2 Correct 410 ms 12908 KB Output is correct
3 Correct 295 ms 12012 KB Output is correct
4 Correct 434 ms 16876 KB Output is correct
5 Correct 368 ms 13932 KB Output is correct

Subtask #16
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 318 ms 5740 KB Output is correct
2 Correct 342 ms 16876 KB Output is correct
3 Correct 340 ms 15980 KB Output is correct
4 Correct 472 ms 19436 KB Output is correct
5 Correct 420 ms 15020 KB Output is correct

Subtask #17
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 338 ms 5868 KB Output is correct
2 Correct 472 ms 15084 KB Output is correct
3 Correct 348 ms 14444 KB Output is correct
4 Correct 462 ms 19308 KB Output is correct
5 Correct 428 ms 16236 KB Output is correct

Subtask #18
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 389 ms 6764 KB Output is correct
2 Correct 388 ms 19052 KB Output is correct
3 Correct 385 ms 18284 KB Output is correct
4 Correct 529 ms 22252 KB Output is correct
5 Correct 493 ms 17844 KB Output is correct

Subtask #19
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 385 ms 6636 KB Output is correct
2 Correct 537 ms 17336 KB Output is correct
3 Correct 400 ms 16236 KB Output is correct
4 Correct 533 ms 22124 KB Output is correct
5 Correct 489 ms 18284 KB Output is correct

Subtask #20
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 446 ms 8172 KB Output is correct
2 Correct 494 ms 23680 KB Output is correct
3 Correct 500 ms 22848 KB Output is correct
4 Correct 663 ms 27504 KB Output is correct
5 Correct 614 ms 21740 KB Output is correct

Subtask #21
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 486 ms 8172 KB Output is correct
2 Correct 663 ms 21484 KB Output is correct
3 Correct 494 ms 20588 KB Output is correct
4 Correct 668 ms 27628 KB Output is correct
5 Correct 617 ms 23020 KB Output is correct