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Submission #314063

# Submission time Handle Problem Language Result Execution time Memory
314063 2020-10-18T03:43:33 Z shrek12357 Mobile (BOI12_mobile) C++14
90 / 100
 1000 ms 16128 KB 
#include <iostream>
#include <vector>
#include <algorithm>
#include <string>
#include <map>
#include <set>
#include <climits>
#include <cmath>
#include <fstream>
#include <queue>
#include <stack>
#include <bitset>
using namespace std;
#define ll long long
//cin.tie(0); ios_base::sync_with_stdio(0); 

const int MAXN = 1e6 + 5;

double n, l;
vector<pair<double, double>> points(MAXN);

bool check(double mid) {
	double left = 0;
	for (int i = 0; i < points.size(); i++) {
		if (left >= l) {
			return true;
		}
		if (mid < points[i].second) {
			continue;
		}
		double temp = sqrt(mid*mid - points[i].second*points[i].second);
		if (temp + points[i].first <= left) {
			continue;
		}
		if (points[i].first - temp <= left) {
			left = points[i].first + temp, left;
		}
	}
	return left >= l;
}

int main() {
	cin.tie(0); ios_base::sync_with_stdio(0); 
	cin >> n >> l;
	for (int i = 0; i < n; i++) {
		double a, b;
		cin >> a >> b;
		points[i] = make_pair( a, b );
	}
	double lo = 0;
	double hi = 1e9;
	double ans = 1e10;
	while (hi - lo > 1e-3) {
		double mid = (lo + hi) / 2;
		if (check(mid)) {
			ans = min(ans, mid);
			hi = mid;
		}
		else {
			lo = mid;
		}
	}
	printf("%.7lf\n", ans);
}

Compilation message

mobile.cpp: In function 'bool check(double)':
mobile.cpp:24:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<double, double> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   24 |  for (int i = 0; i < points.size(); i++) {
      |                  ~~^~~~~~~~~~~~~~~
mobile.cpp:36:39: warning: right operand of comma operator has no effect [-Wunused-value]
   36 |    left = points[i].first + temp, left;
      |                                       ^

Subtask #1
4.0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 43 ms 16000 KB Output is correct
2 Correct 38 ms 16000 KB Output is correct
3 Correct 42 ms 16000 KB Output is correct
4 Correct 54 ms 16000 KB Output is correct

Subtask #2
4.0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 43 ms 16000 KB Output is correct
2 Correct 37 ms 16000 KB Output is correct
3 Correct 59 ms 16000 KB Output is correct
4 Correct 75 ms 16000 KB Output is correct

Subtask #3
4.0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 54 ms 16000 KB Output is correct
2 Correct 44 ms 16120 KB Output is correct
3 Correct 67 ms 16056 KB Output is correct
4 Correct 72 ms 16000 KB Output is correct

Subtask #4
4.0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 57 ms 16056 KB Output is correct
2 Correct 101 ms 16120 KB Output is correct
3 Correct 82 ms 16000 KB Output is correct
4 Correct 84 ms 16000 KB Output is correct

Subtask #5
4.0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 74 ms 16120 KB Output is correct
2 Correct 102 ms 16000 KB Output is correct
3 Correct 55 ms 16000 KB Output is correct
4 Correct 95 ms 16000 KB Output is correct

Subtask #6
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 90 ms 16000 KB Output is correct
2 Correct 101 ms 16000 KB Output is correct
3 Correct 78 ms 16000 KB Output is correct
4 Correct 95 ms 16000 KB Output is correct
5 Correct 61 ms 16000 KB Output is correct

Subtask #7
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 114 ms 16056 KB Output is correct
2 Correct 164 ms 16120 KB Output is correct
3 Correct 88 ms 16128 KB Output is correct
4 Correct 158 ms 16128 KB Output is correct
5 Correct 67 ms 16000 KB Output is correct

Subtask #8
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 94 ms 16000 KB Output is correct
2 Correct 103 ms 16000 KB Output is correct
3 Correct 134 ms 16000 KB Output is correct
4 Correct 155 ms 16000 KB Output is correct
5 Correct 184 ms 16120 KB Output is correct

Subtask #9
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 139 ms 16000 KB Output is correct
2 Correct 145 ms 16120 KB Output is correct
3 Correct 102 ms 16120 KB Output is correct
4 Correct 200 ms 16000 KB Output is correct
5 Correct 105 ms 16000 KB Output is correct

Subtask #10
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 234 ms 16056 KB Output is correct
2 Correct 180 ms 16000 KB Output is correct
3 Correct 134 ms 16000 KB Output is correct
4 Correct 198 ms 16124 KB Output is correct
5 Correct 140 ms 16000 KB Output is correct

Subtask #11
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 151 ms 16056 KB Output is correct
2 Correct 184 ms 16120 KB Output is correct
3 Correct 136 ms 16052 KB Output is correct
4 Correct 194 ms 16000 KB Output is correct
5 Correct 134 ms 16000 KB Output is correct

Subtask #12
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 411 ms 16120 KB Output is correct
2 Correct 408 ms 16056 KB Output is correct
3 Correct 384 ms 16056 KB Output is correct
4 Correct 542 ms 16056 KB Output is correct
5 Correct 450 ms 16000 KB Output is correct

Subtask #13
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 478 ms 16120 KB Output is correct
2 Correct 426 ms 16124 KB Output is correct
3 Correct 332 ms 16000 KB Output is correct
4 Correct 548 ms 16052 KB Output is correct
5 Correct 471 ms 16000 KB Output is correct

Subtask #14
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 471 ms 16048 KB Output is correct
2 Correct 456 ms 16000 KB Output is correct
3 Correct 406 ms 16052 KB Output is correct
4 Correct 669 ms 16000 KB Output is correct
5 Correct 522 ms 16120 KB Output is correct

Subtask #15
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 536 ms 16000 KB Output is correct
2 Correct 489 ms 16052 KB Output is correct
3 Correct 394 ms 16000 KB Output is correct
4 Correct 672 ms 16052 KB Output is correct
5 Correct 566 ms 16060 KB Output is correct

Subtask #16
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 510 ms 16120 KB Output is correct
2 Correct 530 ms 16000 KB Output is correct
3 Correct 518 ms 16056 KB Output is correct
4 Correct 767 ms 16056 KB Output is correct
5 Correct 583 ms 16060 KB Output is correct

Subtask #17
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 582 ms 16000 KB Output is correct
2 Correct 547 ms 16052 KB Output is correct
3 Correct 450 ms 16000 KB Output is correct
4 Correct 745 ms 16048 KB Output is correct
5 Correct 638 ms 16000 KB Output is correct

Subtask #18
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 574 ms 16124 KB Output is correct
2 Correct 584 ms 16000 KB Output is correct
3 Correct 535 ms 16056 KB Output is correct
4 Correct 852 ms 16056 KB Output is correct
5 Correct 684 ms 16120 KB Output is correct

Subtask #19
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 650 ms 16052 KB Output is correct
2 Correct 616 ms 16120 KB Output is correct
3 Correct 476 ms 16000 KB Output is correct
4 Correct 851 ms 16000 KB Output is correct
5 Correct 709 ms 16120 KB Output is correct

Subtask #20
0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 718 ms 16056 KB Output is correct
2 Correct 676 ms 16120 KB Output is correct
3 Correct 689 ms 16048 KB Output is correct
4 Execution timed out 1037 ms 16120 KB Time limit exceeded
5 Halted 0 ms 0 KB -

Subtask #21
0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 779 ms 16120 KB Output is correct
2 Correct 745 ms 16120 KB Output is correct
3 Correct 614 ms 16120 KB Output is correct
4 Execution timed out 1020 ms 16120 KB Time limit exceeded
5 Halted 0 ms 0 KB -