oj.uz

Submission #467893

# Submission time Handle Problem Language Result Execution time Memory
467893 2021-08-25T13:44:25 Z kaxzert Mobile (BOI12_mobile) C++17
0 / 100
 131 ms 5492 KB 
/**
      00  00      11      00  00  111111  00000  111111  000000
      00 00      1111      0000      11   00     11  11  000000
      0000      11  11      00      11    00000  111111    00
      00 00    11111111    0000    11     00     11 11     00
      00  00  11      11  00  00  111111  00000  11  11    00
**/

#include<bits/stdc++.h>

using namespace std;

void setIO(string s) {
    freopen((s+".inp").c_str(),"r",stdin);
    freopen((s+".out").c_str(),"w",stdout);
}

void setIOusaco(string s) {
    freopen((s+".in").c_str(),"r",stdin);
    freopen((s+".out").c_str(),"w",stdout);
}

#define fto(i, a, b) for(int i = a; i <= b; ++i)
#define fdto(i, a, b) for(int i = a; i >= b; --i)
#define bugarr(a, i, j) cout << #a << "{" << i << "..." << j << "}:"; fto(k, i, j-1) cout << a[k] << ", "; cout << a[j] << endl;
#define ll long long
#define db double
#define ldb long double
#define ii pair<int, int>
#define ff first
#define ss second
#define pb push_back
#define mp make_pair
#define eb emplace_back
#define vt vector
#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()
#define trav(i, a) for(auto &i : a)
#define sz(a) (int)a.size()
#define fast ios::sync_with_stdio(false); cin.tie(0)

template<typename T, typename V>
bool ckmin(T &a, V b) {return (b < a)? a = b, true : false;}
template<typename T, typename V>
bool ckmax(T &a, V b) {return (b > a)? a = b, true : false;}

#define eps 0.000000000001

db cal(db mid, db height) {
    return sqrt(mid*mid - height*height);
}

#define maxN 100008

pair<db, db> a[maxN];

int main() {

    fast;
    int n;
    db mx;
    cin >> n >> mx;
    fto(i, 1, n) {
        cin >> a[i].ff >> a[i].ss;
        a[i].ss = abs(a[i].ss);
    }

    auto check = [=](db mid) -> bool {
        int pos = 0;
        db far = 0;
        fto(i, 1, n) {
            if (mid - eps > a[i].ss) {
                db dis = cal(mid, a[i].ss);
                if (a[i].ff-dis < -eps && ckmax(far, a[i].ff+dis)) {
                    pos = i;
                }
            }
        }
        if (pos == 0) return 0;
        far = a[pos].ff + cal(mid, a[pos].ss);
        fto(i, pos+1, n) {
            db dis = cal(mid, a[i].ss);
            if (far - eps > a[i].ff+dis || a[i].ff - dis - eps > far) continue;
            far = a[i].ff + dis;
        }

        return (far - eps > mx);
    };

    db left = 1, right = 1.5e9;
    db ans;
    while(right-left > 1e-6) {
        db mid = (left+right)/2;
        if (check(mid)) {
            ans = mid;
            right = mid;
        } else left = mid;
    }

    cout << fixed << setprecision(4) << ans << '\n';

    return 0;
}

Compilation message

mobile.cpp: In function 'void setIO(std::string)':
mobile.cpp:14:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   14 |     freopen((s+".inp").c_str(),"r",stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
mobile.cpp:15:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   15 |     freopen((s+".out").c_str(),"w",stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
mobile.cpp: In function 'void setIOusaco(std::string)':
mobile.cpp:19:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   19 |     freopen((s+".in").c_str(),"r",stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
mobile.cpp:20:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   20 |     freopen((s+".out").c_str(),"w",stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
0 / 4.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 204 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #2
0 / 4.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 204 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
0 / 4.0

# Verdict Execution time Memory Grader output
1 Incorrect 3 ms 332 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 332 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #5
0 / 4.0

# Verdict Execution time Memory Grader output
1 Incorrect 4 ms 332 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #6
0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 332 KB Output is correct
2 Correct 6 ms 460 KB Output is correct
3 Correct 4 ms 336 KB Output is correct
4 Incorrect 6 ms 452 KB Output isn't correct
5 Halted 0 ms 0 KB -

Subtask #7
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 89 ms 2260 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #8
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 67 ms 2328 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #9
0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 71 ms 2240 KB Output is correct
2 Correct 73 ms 2700 KB Output is correct
3 Correct 65 ms 2556 KB Output is correct
4 Incorrect 120 ms 3436 KB Output isn't correct
5 Halted 0 ms 0 KB -

Subtask #10
0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 95 ms 3524 KB Output is correct
2 Correct 85 ms 3268 KB Output is correct
3 Correct 74 ms 2772 KB Output is correct
4 Incorrect 112 ms 3524 KB Output isn't correct
5 Halted 0 ms 0 KB -

Subtask #11
0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 98 ms 3492 KB Output is correct
2 Correct 85 ms 3272 KB Output is correct
3 Correct 74 ms 2880 KB Output is correct
4 Incorrect 131 ms 3408 KB Output isn't correct
5 Halted 0 ms 0 KB -

Subtask #12
0 / 5.0

# Verdict Execution time Memory Grader output
1 Runtime error 50 ms 4536 KB Execution killed with signal 11
2 Halted 0 ms 0 KB -

Subtask #13
0 / 5.0

# Verdict Execution time Memory Grader output
1 Runtime error 67 ms 5448 KB Execution killed with signal 11
2 Halted 0 ms 0 KB -

Subtask #14
0 / 5.0

# Verdict Execution time Memory Grader output
1 Runtime error 51 ms 4508 KB Execution killed with signal 11
2 Halted 0 ms 0 KB -

Subtask #15
0 / 5.0

# Verdict Execution time Memory Grader output
1 Runtime error 67 ms 5492 KB Execution killed with signal 11
2 Halted 0 ms 0 KB -

Subtask #16
0 / 5.0

# Verdict Execution time Memory Grader output
1 Runtime error 51 ms 4424 KB Execution killed with signal 11
2 Halted 0 ms 0 KB -

Subtask #17
0 / 5.0

# Verdict Execution time Memory Grader output
1 Runtime error 67 ms 5124 KB Execution killed with signal 11
2 Halted 0 ms 0 KB -

Subtask #18
0 / 5.0

# Verdict Execution time Memory Grader output
1 Runtime error 50 ms 3944 KB Execution killed with signal 11
2 Halted 0 ms 0 KB -

Subtask #19
0 / 5.0

# Verdict Execution time Memory Grader output
1 Runtime error 68 ms 4640 KB Execution killed with signal 11
2 Halted 0 ms 0 KB -

Subtask #20
0 / 5.0

# Verdict Execution time Memory Grader output
1 Runtime error 52 ms 3508 KB Execution killed with signal 11
2 Halted 0 ms 0 KB -

Subtask #21
0 / 5.0

# Verdict Execution time Memory Grader output
1 Runtime error 72 ms 4008 KB Execution killed with signal 11
2 Halted 0 ms 0 KB -