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Submission #1033369

# Submission time Handle Problem Language Result Execution time Memory
1033369 2024-07-24T17:21:01 Z vjudge1 Mobile (BOI12_mobile) C++17
50 / 100
 57 ms 3932 KB 
#include<bits/stdc++.h>
using namespace std;

const bool multiTest = false;
#define task ""
#define fi first
#define se second
#define MASK(i) (1LL << (i))
#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()
#define BIT(mask, i) ((mask) >> (i) & 1)

template<typename T1, typename T2> bool minimize(T1 &a, T2 b) {
	if (a > b) a = b; else return 0; return 1;
}
template<typename T1, typename T2> bool maximize(T1 &a, T2 b) {
	if (a < b) a = b; else return 0; return 1;
}

const int MAX = 100100;
int n, L;
int x[MAX];
int y[MAX];

bool ok(double r) {
    double c = 0;
    for (int i = 1; i <= n; ++i) {
        double delta = sqrt(r * r - 1LL * y[i] * y[i]);
        if (x[i] - delta <= c) {
            maximize(c, x[i] + delta);
        }
    }
    return c >= L;
}

void process(void) {
    cin >> n >> L;
    for (int i = 1; i <= n; ++i) {
        cin >> x[i] >> y[i];
    }
    double l = 0, r = 1.5e9;
    for (int t = 0; t < 100; ++t) {
        double mid = (l + r) / 2;
        if (ok(mid)) r = mid;
        else l = mid;
    }
    cout << setprecision(12) << fixed << r;
}

int main(void) {
	ios_base::sync_with_stdio(false); cin.tie(nullptr); cout.tie(nullptr);
	if (fopen(task".inp", "r")) {
		freopen(task".inp", "r",  stdin);
		freopen(task".out", "w", stdout);
	}

	int nTest = 1; if (multiTest) cin >> nTest;
	while (nTest--) {
		process();
	}

	return 0;
}

Compilation message

mobile.cpp: In function 'int main()':
mobile.cpp:53:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   53 |   freopen(task".inp", "r",  stdin);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
mobile.cpp:54:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   54 |   freopen(task".out", "w", stdout);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
4.0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct

Subtask #2
4.0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct

Subtask #3
4.0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 348 KB Output is correct
2 Correct 2 ms 348 KB Output is correct
3 Correct 1 ms 348 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 3 ms 348 KB Output is correct
2 Correct 2 ms 476 KB Output is correct
3 Correct 2 ms 348 KB Output is correct
4 Correct 3 ms 348 KB Output is correct

Subtask #5
4.0 / 4.0

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

Subtask #6
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 348 KB Output is correct
2 Correct 2 ms 348 KB Output is correct
3 Correct 2 ms 344 KB Output is correct
4 Correct 2 ms 348 KB Output is correct
5 Correct 4 ms 344 KB Output is correct

Subtask #7
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 57 ms 1624 KB Output is correct
2 Correct 31 ms 1904 KB Output is correct
3 Correct 20 ms 1368 KB Output is correct
4 Correct 36 ms 2140 KB Output is correct
5 Correct 20 ms 1116 KB Output is correct

Subtask #8
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 35 ms 1624 KB Output is correct
2 Correct 31 ms 1752 KB Output is correct
3 Correct 37 ms 1884 KB Output is correct
4 Correct 39 ms 2140 KB Output is correct
5 Correct 44 ms 2392 KB Output is correct

Subtask #9
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 33 ms 1628 KB Output is correct
2 Correct 34 ms 2140 KB Output is correct
3 Correct 34 ms 1884 KB Output is correct
4 Correct 49 ms 3156 KB Output is correct
5 Correct 40 ms 1880 KB Output is correct

Subtask #10
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 40 ms 2708 KB Output is correct
2 Correct 41 ms 2652 KB Output is correct
3 Correct 41 ms 2136 KB Output is correct
4 Correct 50 ms 3160 KB Output is correct
5 Correct 55 ms 2396 KB Output is correct

Subtask #11
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 40 ms 2652 KB Output is correct
2 Correct 41 ms 2652 KB Output is correct
3 Correct 39 ms 2392 KB Output is correct
4 Correct 53 ms 3164 KB Output is correct
5 Correct 49 ms 2396 KB Output is correct

Subtask #12
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 38 ms 2140 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #13
0 / 5.0

# Verdict Execution time Memory Grader output
1 Runtime error 14 ms 3932 KB Execution killed with signal 11
2 Halted 0 ms 0 KB -

Subtask #14
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 38 ms 2136 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #15
0 / 5.0

# Verdict Execution time Memory Grader output
1 Runtime error 16 ms 3924 KB Execution killed with signal 11
2 Halted 0 ms 0 KB -

Subtask #16
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 39 ms 2392 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #17
0 / 5.0

# Verdict Execution time Memory Grader output
1 Runtime error 18 ms 3928 KB Execution killed with signal 11
2 Halted 0 ms 0 KB -

Subtask #18
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 38 ms 2140 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #19
0 / 5.0

# Verdict Execution time Memory Grader output
1 Runtime error 14 ms 3932 KB Execution killed with signal 11
2 Halted 0 ms 0 KB -

Subtask #20
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 39 ms 2060 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #21
0 / 5.0

# Verdict Execution time Memory Grader output
1 Runtime error 14 ms 3928 KB Execution killed with signal 11
2 Halted 0 ms 0 KB -