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답안 #465626

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
465626 2021-08-16T14:57:39 Z tphuc2908 Mobile (BOI12_mobile) C++14
100 / 100
 484 ms 35132 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)
#define mp make_pair
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, cnt = 0;
double L;
pair<double, double> a[N], b[N];
double pref[N];

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

bool check(double x){
    x = x*x;
    double cur = 0;
    rep(i,1,n){
        if(a[i].se > x) continue;
        double temp = sqrt(x - a[i].se);
        double val = a[i].fi + temp;
        double val1 = a[i].fi - temp;
        if(val1 <= cur)
            cur = max(cur, val);
    }
    return cur >= L;
}

double res;

void process(){
    rep(i,1,n)
        a[i].se = a[i].se*a[i].se;
    double l = 0, r = 1e9;
    rep(i,1,50){
        double mid = (l + r) / 2;
        if(check(mid)){
            res = mid;
            r = mid;
        }
        else l = mid;
    }
    cout << fixed << setprecision(6) << 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:23:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   23 |         freopen("text.inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
4.0 / 4.0

# 결과 실행 시간 메모리 Grader output
1 Correct 0 ms 204 KB Output is correct
2 Correct 1 ms 204 KB Output is correct
3 Correct 1 ms 316 KB Output is correct
4 Correct 1 ms 316 KB Output is correct

Subtask #2
4.0 / 4.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 332 KB Output is correct
2 Correct 1 ms 332 KB Output is correct
3 Correct 1 ms 332 KB Output is correct
4 Correct 1 ms 204 KB Output is correct

Subtask #3
4.0 / 4.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 332 KB Output is correct
2 Correct 1 ms 332 KB Output is correct
3 Correct 1 ms 332 KB Output is correct
4 Correct 2 ms 332 KB Output is correct

Subtask #4
4.0 / 4.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 332 KB Output is correct
2 Correct 3 ms 460 KB Output is correct
3 Correct 2 ms 332 KB Output is correct
4 Correct 3 ms 460 KB Output is correct

Subtask #5
4.0 / 4.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 460 KB Output is correct
2 Correct 2 ms 460 KB Output is correct
3 Correct 2 ms 332 KB Output is correct
4 Correct 3 ms 460 KB Output is correct

Subtask #6
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 456 KB Output is correct
2 Correct 3 ms 460 KB Output is correct
3 Correct 2 ms 332 KB Output is correct
4 Correct 3 ms 460 KB Output is correct
5 Correct 2 ms 452 KB Output is correct

Subtask #7
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 34 ms 2252 KB Output is correct
2 Correct 32 ms 2508 KB Output is correct
3 Correct 20 ms 1740 KB Output is correct
4 Correct 27 ms 2528 KB Output is correct
5 Correct 17 ms 1504 KB Output is correct

Subtask #8
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 27 ms 2292 KB Output is correct
2 Correct 25 ms 2168 KB Output is correct
3 Correct 30 ms 2608 KB Output is correct
4 Correct 28 ms 2496 KB Output is correct
5 Correct 32 ms 2684 KB Output is correct

Subtask #9
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 35 ms 2280 KB Output is correct
2 Correct 38 ms 2704 KB Output is correct
3 Correct 32 ms 2540 KB Output is correct
4 Correct 39 ms 2844 KB Output is correct
5 Correct 31 ms 2628 KB Output is correct

Subtask #10
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 42 ms 2884 KB Output is correct
2 Correct 42 ms 2896 KB Output is correct
3 Correct 37 ms 2900 KB Output is correct
4 Correct 38 ms 2848 KB Output is correct
5 Correct 34 ms 2864 KB Output is correct

Subtask #11
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 43 ms 2844 KB Output is correct
2 Correct 48 ms 2812 KB Output is correct
3 Correct 37 ms 2892 KB Output is correct
4 Correct 43 ms 2900 KB Output is correct
5 Correct 35 ms 2892 KB Output is correct

Subtask #12
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 203 ms 10092 KB Output is correct
2 Correct 213 ms 10188 KB Output is correct
3 Correct 213 ms 15368 KB Output is correct
4 Correct 183 ms 17608 KB Output is correct
5 Correct 175 ms 14856 KB Output is correct

Subtask #13
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 213 ms 10128 KB Output is correct
2 Correct 249 ms 14824 KB Output is correct
3 Correct 185 ms 13884 KB Output is correct
4 Correct 196 ms 17460 KB Output is correct
5 Correct 180 ms 15428 KB Output is correct

Subtask #14
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 227 ms 11716 KB Output is correct
2 Correct 254 ms 12356 KB Output is correct
3 Correct 252 ms 18400 KB Output is correct
4 Correct 226 ms 21576 KB Output is correct
5 Correct 214 ms 17604 KB Output is correct

Subtask #15
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 252 ms 11692 KB Output is correct
2 Correct 295 ms 17616 KB Output is correct
3 Correct 222 ms 16652 KB Output is correct
4 Correct 230 ms 21308 KB Output is correct
5 Correct 214 ms 18372 KB Output is correct

Subtask #16
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 265 ms 13252 KB Output is correct
2 Correct 300 ms 13988 KB Output is correct
3 Correct 302 ms 21416 KB Output is correct
4 Correct 281 ms 24788 KB Output is correct
5 Correct 277 ms 20288 KB Output is correct

Subtask #17
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 304 ms 13608 KB Output is correct
2 Correct 331 ms 20420 KB Output is correct
3 Correct 282 ms 19744 KB Output is correct
4 Correct 262 ms 24632 KB Output is correct
5 Correct 258 ms 21304 KB Output is correct

Subtask #18
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 301 ms 15044 KB Output is correct
2 Correct 346 ms 15720 KB Output is correct
3 Correct 340 ms 24388 KB Output is correct
4 Correct 307 ms 28484 KB Output is correct
5 Correct 299 ms 24004 KB Output is correct

Subtask #19
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 346 ms 15440 KB Output is correct
2 Correct 394 ms 23384 KB Output is correct
3 Correct 307 ms 22408 KB Output is correct
4 Correct 338 ms 28280 KB Output is correct
5 Correct 293 ms 24336 KB Output is correct

Subtask #20
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 402 ms 18788 KB Output is correct
2 Correct 456 ms 18904 KB Output is correct
3 Correct 421 ms 30496 KB Output is correct
4 Correct 379 ms 35132 KB Output is correct
5 Correct 359 ms 29512 KB Output is correct

Subtask #21
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 484 ms 15936 KB Output is correct
2 Correct 469 ms 29252 KB Output is correct
3 Correct 391 ms 28228 KB Output is correct
4 Correct 376 ms 34296 KB Output is correct
5 Correct 359 ms 30688 KB Output is correct