oj.uz

Submission #231346

# Submission time Handle Problem Language Result Execution time Memory
231346 2020-05-13T11:33:56 Z DodgeBallMan Mobile (BOI12_mobile) C++14
100 / 100
 745 ms 35288 KB 
#include <bits/stdc++.h>

using namespace std;

const int N = 1e6 + 10;
int n;
double L, x[N], y[N];

bool check( double mid ) {
    double mx = 0;
    for( int i = 1 ; i <= n ; i++ ) {
        double len = sqrt( mid*mid - y[i]*y[i] );
        double le = x[i] - len, ri = x[i] + len;
        if( le <= mx ) mx = max( mx, ri );
    }
    return ( mx >= L );
}
int main()
{
    scanf("%d %lf",&n,&L);
    for( int i = 1 ; i <= n ; i++ ) scanf("%lf %lf",&x[i],&y[i]);
    double l = 1, r = 5e8;
    while( r - l > 0.001 ) {
        double mid = ( l + r ) / 2.0;
        if( check( mid ) ) r = mid;
        else l = mid;
    }
    printf("%.4lf",l);
    return 0;
}

Compilation message

mobile.cpp: In function 'int main()':
mobile.cpp:20:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d %lf",&n,&L);
     ~~~~~^~~~~~~~~~~~~~~~
mobile.cpp:21:42: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     for( int i = 1 ; i <= n ; i++ ) scanf("%lf %lf",&x[i],&y[i]);
                                     ~~~~~^~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
4.0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 384 KB Output is correct
2 Correct 5 ms 256 KB Output is correct
3 Correct 4 ms 384 KB Output is correct
4 Correct 5 ms 384 KB Output is correct

Subtask #2
4.0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 384 KB Output is correct
2 Correct 5 ms 384 KB Output is correct
3 Correct 5 ms 384 KB Output is correct
4 Correct 4 ms 384 KB Output is correct

Subtask #3
4.0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 384 KB Output is correct
2 Correct 6 ms 384 KB Output is correct
3 Correct 5 ms 384 KB Output is correct
4 Correct 6 ms 384 KB Output is correct

Subtask #4
4.0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 8 ms 384 KB Output is correct
2 Correct 7 ms 384 KB Output is correct
3 Correct 7 ms 384 KB Output is correct
4 Correct 8 ms 384 KB Output is correct

Subtask #5
4.0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 9 ms 512 KB Output is correct
2 Correct 7 ms 384 KB Output is correct
3 Correct 7 ms 384 KB Output is correct
4 Correct 8 ms 384 KB Output is correct

Subtask #6
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 384 KB Output is correct
2 Correct 7 ms 384 KB Output is correct
3 Correct 8 ms 512 KB Output is correct
4 Correct 8 ms 384 KB Output is correct
5 Correct 7 ms 384 KB Output is correct

Subtask #7
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 52 ms 1656 KB Output is correct
2 Correct 43 ms 1528 KB Output is correct
3 Correct 32 ms 1152 KB Output is correct
4 Correct 56 ms 1656 KB Output is correct
5 Correct 33 ms 1144 KB Output is correct

Subtask #8
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 49 ms 1536 KB Output is correct
2 Correct 47 ms 1400 KB Output is correct
3 Correct 55 ms 1656 KB Output is correct
4 Correct 59 ms 1528 KB Output is correct
5 Correct 65 ms 1664 KB Output is correct

Subtask #9
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 43 ms 1664 KB Output is correct
2 Correct 45 ms 1656 KB Output is correct
3 Correct 49 ms 1656 KB Output is correct
4 Correct 77 ms 1912 KB Output is correct
5 Correct 59 ms 1912 KB Output is correct

Subtask #10
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 55 ms 1912 KB Output is correct
2 Correct 56 ms 1912 KB Output is correct
3 Correct 57 ms 1912 KB Output is correct
4 Correct 80 ms 2040 KB Output is correct
5 Correct 66 ms 1912 KB Output is correct

Subtask #11
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 56 ms 1912 KB Output is correct
2 Correct 54 ms 1912 KB Output is correct
3 Correct 62 ms 1920 KB Output is correct
4 Correct 79 ms 1912 KB Output is correct
5 Correct 67 ms 1912 KB Output is correct

Subtask #12
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 232 ms 11500 KB Output is correct
2 Correct 265 ms 15992 KB Output is correct
3 Correct 255 ms 15352 KB Output is correct
4 Correct 376 ms 17784 KB Output is correct
5 Correct 325 ms 15084 KB Output is correct

Subtask #13
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 269 ms 14584 KB Output is correct
2 Correct 341 ms 14840 KB Output is correct
3 Correct 267 ms 13944 KB Output is correct
4 Correct 369 ms 17528 KB Output is correct
5 Correct 322 ms 15500 KB Output is correct

Subtask #14
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 269 ms 13968 KB Output is correct
2 Correct 312 ms 19068 KB Output is correct
3 Correct 306 ms 18424 KB Output is correct
4 Correct 438 ms 21628 KB Output is correct
5 Correct 389 ms 17656 KB Output is correct

Subtask #15
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 312 ms 17856 KB Output is correct
2 Correct 408 ms 17656 KB Output is correct
3 Correct 321 ms 16632 KB Output is correct
4 Correct 446 ms 21496 KB Output is correct
5 Correct 390 ms 18424 KB Output is correct

Subtask #16
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 315 ms 16404 KB Output is correct
2 Correct 355 ms 22136 KB Output is correct
3 Correct 365 ms 21624 KB Output is correct
4 Correct 508 ms 24800 KB Output is correct
5 Correct 448 ms 20408 KB Output is correct

Subtask #17
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 376 ms 21244 KB Output is correct
2 Correct 481 ms 20600 KB Output is correct
3 Correct 377 ms 19704 KB Output is correct
4 Correct 517 ms 24700 KB Output is correct
5 Correct 478 ms 21368 KB Output is correct

Subtask #18
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 384 ms 19748 KB Output is correct
2 Correct 407 ms 25212 KB Output is correct
3 Correct 407 ms 24564 KB Output is correct
4 Correct 594 ms 28792 KB Output is correct
5 Correct 520 ms 24184 KB Output is correct

Subtask #19
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 422 ms 24744 KB Output is correct
2 Correct 536 ms 23544 KB Output is correct
3 Correct 422 ms 22428 KB Output is correct
4 Correct 596 ms 28408 KB Output is correct
5 Correct 521 ms 24568 KB Output is correct

Subtask #20
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 453 ms 24480 KB Output is correct
2 Correct 525 ms 31632 KB Output is correct
3 Correct 500 ms 30604 KB Output is correct
4 Correct 745 ms 35192 KB Output is correct
5 Correct 639 ms 29568 KB Output is correct

Subtask #21
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 526 ms 31352 KB Output is correct
2 Correct 660 ms 29204 KB Output is correct
3 Correct 539 ms 28292 KB Output is correct
4 Correct 738 ms 35288 KB Output is correct
5 Correct 655 ms 30840 KB Output is correct