oj.uz

Submission #96432

# Submission time Handle Problem Language Result Execution time Memory
96432 2019-02-09T12:51:53 Z easrui Mobile (BOI12_mobile) C++14
0 / 100
 4 ms 524 KB 
#include <bits/stdc++.h>
using namespace std;
const int MN = 1e6+5;
int N,L,C[MN],num[MN],cur,pos;
long long X[MN],Y[MN],A[MN],B[MN];
long double Ipos[MN],x,ans,tmp;

bool cmp(int a, int b)
{
    if(A[a]==A[b]) return B[a]<B[b];
    return A[a]>A[b];
}

long double getI(int a, int b)
{
    if(A[a]==A[b]) return L;
    return (long double)(B[a]-B[b])/(A[b]-A[a]);
}

int main()
{
    ios_base::sync_with_stdio(0),cin.tie(0);
    freopen("C:\\Users\\user\\Downloads\\mobile_tests\\mobile.i03d","r",stdin);
    cin >> N >> L;
    for(int i=0; i<N; i++){
        cin >> X[i] >> Y[i];
        A[i] = X[i]*(-2);
        B[i] = X[i]*X[i]+Y[i]*Y[i];
        num[i] = i;
    }
    sort(num,num+N,cmp);
    Ipos[pos] = 0;
    C[pos] = num[0];
    for(int i=1; i<N; i++){
        cur = num[i];
        while(1){
            if(pos==-1){
                Ipos[++pos] = 0;
                C[pos] = cur;
                break;
            }
            x = getI(C[pos],cur);
            if(x>=L) break;
            if(x>Ipos[pos]){
                Ipos[++pos] = x;
                C[pos] = cur;
                break;
            }
            pos--;
        }
    }
    Ipos[pos+1] = L;
    for(int i=0; i<=pos; i++){
        cur = C[i];
        tmp = max((Ipos[i]-X[cur])*(Ipos[i]-X[cur]),(Ipos[i+1]-X[cur])*(Ipos[i+1]-X[cur]))+Y[cur]*Y[cur];
        ans = max(ans,tmp);
    }
    cout << fixed;
    cout.precision(4);
    cout << sqrt(ans);
}

Compilation message

mobile.cpp: In function 'int main()':
mobile.cpp:23:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
     freopen("C:\\Users\\user\\Downloads\\mobile_tests\\mobile.i03d","r",stdin);
     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
0 / 4.0

# Verdict Execution time Memory Grader output
1 Incorrect 4 ms 504 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #2
0 / 4.0

# Verdict Execution time Memory Grader output
1 Incorrect 3 ms 376 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 376 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
0 / 4.0

# Verdict Execution time Memory Grader output
1 Incorrect 3 ms 376 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #5
0 / 4.0

# Verdict Execution time Memory Grader output
1 Incorrect 3 ms 380 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #6
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 3 ms 504 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #7
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 3 ms 504 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #8
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 4 ms 504 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #9
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 3 ms 380 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #10
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 4 ms 376 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #11
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 3 ms 524 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #12
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 4 ms 480 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #13
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 4 ms 376 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #14
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 3 ms 504 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #15
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 3 ms 376 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #16
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 3 ms 376 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #17
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 3 ms 504 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #18
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 4 ms 504 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #19
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 3 ms 504 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #20
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 4 ms 376 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #21
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 4 ms 504 KB Output isn't correct
2 Halted 0 ms 0 KB -