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Submission #67573

# Submission time Handle Problem Language Result Execution time Memory
67573 2018-08-15T03:18:31 Z thebes Mobile (BOI12_mobile) C++14
0 / 100
 1000 ms 8524 KB 
#pragma GCC optimize("Ofast")
#pragma GCC optimize("unroll-loops")
#pragma GCC target("sse,sse2,ssse3,sse3,sse4,popcnt,avx,mmx,abm,tune=native")
#include <bits/stdc++.h>
#define sq(x) ((x)*(x))
using namespace std;

const int MN = 1e6+6;
double lo, hi = 1e12, eps = 1e-7;
int N, M, i, j;
pair<int,int> pnt[MN];
inline bool check(double d){
	double mx = 0;
	for(int i=1;i<=N;i++){
		if(abs(pnt[i].second)>d) continue;
		double dx=sqrt(sq(d)-sq(pnt[i].second));
		if(pnt[i].first-dx<=mx) mx=max(mx,pnt[i].first+dx);
		else return 0;
	}
	return mx>=M; 
}

int main(){
	for(scanf("%d%d",&N,&M),i=1;i<=N;i++)
		scanf("%d%d",&pnt[i].first,&pnt[i].second);
	sort(pnt+1,pnt+N+1,[](pair<int,int>i,pair<int,int>j){return i.first<j.first;});
	while(lo+eps<hi){
		double m = (lo+hi)/2.0;
		if(check(m)) hi=m;
		else lo=m+eps;
	}
	printf("%.7lf\n",lo);
	return 0;
}

Compilation message

mobile.cpp: In function 'int main()':
mobile.cpp:24:25: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  for(scanf("%d%d",&N,&M),i=1;i<=N;i++)
      ~~~~~~~~~~~~~~~~~~~^~~~
mobile.cpp:25:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d%d",&pnt[i].first,&pnt[i].second);
   ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 248 KB Output is correct
2 Correct 3 ms 356 KB Output is correct
3 Incorrect 2 ms 432 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #2
0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 448 KB Output is correct
2 Correct 2 ms 508 KB Output is correct
3 Correct 2 ms 524 KB Output is correct
4 Incorrect 2 ms 576 KB Output isn't correct

Subtask #3
0 / 4.0

# Verdict Execution time Memory Grader output
1 Incorrect 4 ms 576 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
0 / 4.0

# Verdict Execution time Memory Grader output
1 Incorrect 5 ms 584 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #5
0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 584 KB Output is correct
2 Correct 8 ms 760 KB Output is correct
3 Incorrect 6 ms 760 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #6
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 8 ms 760 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #7
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 69 ms 1144 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #8
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 54 ms 1272 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #9
0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 86 ms 1316 KB Output is correct
2 Incorrect 63 ms 1316 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #10
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 82 ms 1408 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #11
0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 104 ms 1408 KB Output is correct
2 Incorrect 78 ms 1408 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #12
0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 523 ms 4640 KB Output is correct
2 Incorrect 385 ms 4640 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #13
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 381 ms 4640 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #14
0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 651 ms 5372 KB Output is correct
2 Incorrect 433 ms 5372 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #15
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 485 ms 5444 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #16
0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 697 ms 6212 KB Output is correct
2 Incorrect 519 ms 6212 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #17
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 544 ms 6212 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #18
0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 754 ms 6868 KB Output is correct
2 Incorrect 516 ms 6908 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #19
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 696 ms 6908 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #20
0 / 5.0

# Verdict Execution time Memory Grader output
1 Execution timed out 1012 ms 8452 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #21
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 811 ms 8524 KB Output isn't correct
2 Halted 0 ms 0 KB -