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Submission #465494

# Submission time Handle Problem Language Result Execution time Memory
465494 2021-08-16T08:38:21 Z tphuc2908 Mobile (BOI12_mobile) C++14
0 / 100
 670 ms 32540 KB 
#include<bits/stdc++.h>

using namespace std;
#define rep(i, x, y) for(int i = x; i <= y; ++i)
#define repi(i,x,y) for(int i = x; i >= y; --i)
#define ci(x) int x; cin>> x
#define TC(t) ci(t); while(t--)
#define fi first
#define se second
#define pb push_back
#define all(x) x.begin(), x.end()
#define cii(x, y) ci(x); ci(y)
typedef long long ll;
typedef vector<int> vi;
const int N = 1e6 + 5;
const int mod = 1e9+7;
const int inf = 1e9 + 5;

void readfile(){
    #ifdef ONLINE_JUDGE
    #else
        freopen("text.inp", "r", stdin);
    #endif // ONLINE_JUDGE
//    freopen("angry.in", "r", stdin);
//    freopen("angry.out", "w", stdout);
}

int n;
int L;
pair<double, double> a[N];
vector<pair<double, double> > store;

void inp(){
    cin >> n >> L;
    rep(i,1,n){
        cii(x, y);
        a[i] = {double(x), double(y)};
    }
}

void trim(){
    rep(i,1,n){
        if(i==1 || a[i].fi != a[i-1].fi)
            store.pb(a[i]);
    }
}

void process(){
    trim();
    if((int)store.size()==1){
        cout << max(sqrt((store[0].fi-L)*(store[0].fi-L) + store[0].se*store[0].se), sqrt(store[0].fi*store[0].fi + store[0].se*store[0].se));
        return;
    }
    double res = 0;
    if(0 <= a[0].fi)
        res = sqrt(a[0].fi*a[0].fi + a[0].se*a[0].se);
    rep(i,0,(int)store.size()-2){
        double l = store[i].fi, r = store[i+1].fi;
        rep(j,1,30){
            double mid = (l + r) / 2;
            double cal1 = sqrt((mid-store[i].fi)*(mid-store[i].fi) + store[i].se*store[i].se);
            double cal2 = sqrt((mid-store[i+1].fi)*(mid-store[i+1].fi) + store[i+1].se*store[i+1].se);
            res = max(res, min(cal1, cal2));
            if(cal1 <= cal2)
                l = mid;
            else r = mid;
        }
    }
    if(L >= store.back().fi)
        res = max(res, sqrt((store.back().fi - L)*(store.back().fi - L) + store.back().se*store.back().se));
    cout << fixed << setprecision(3) << res;
}

int main(){
    //readfile();
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    inp();
    process();
    return 0;
}

Compilation message

mobile.cpp: In function 'void readfile()':
mobile.cpp:22:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   22 |         freopen("text.inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~

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 1 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 3 ms 504 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 460 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #6
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 4 ms 588 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #7
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 50 ms 3768 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #8
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 20 ms 1824 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #9
0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 59 ms 3912 KB Output is correct
2 Incorrect 46 ms 2824 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #10
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 46 ms 3124 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #11
0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 74 ms 4160 KB Output is correct
2 Incorrect 45 ms 4412 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #12
0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 342 ms 16516 KB Output is correct
2 Incorrect 128 ms 16212 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #13
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 132 ms 8580 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #14
0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 411 ms 26388 KB Output is correct
2 Incorrect 162 ms 19176 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #15
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 166 ms 10020 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #16
0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 478 ms 27916 KB Output is correct
2 Incorrect 200 ms 22328 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #17
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 198 ms 11568 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #18
0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 538 ms 29420 KB Output is correct
2 Incorrect 238 ms 25412 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #19
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 198 ms 13156 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #20
0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 670 ms 32540 KB Output is correct
2 Incorrect 259 ms 31556 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #21
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 244 ms 16144 KB Output isn't correct
2 Halted 0 ms 0 KB -