Submission #1063921

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
1063921	2024-08-18T06:08:08 Z	daviedu	Mobile (BOI12_mobile)	C++17	32 / 100	214 ms	19540 KB

mobile

#include <bits/stdc++.h>
using namespace std;

#define fastio ios_base::sync_with_stdio(0); cin.tie(0)
#define all(a) a.begin(), a.end()
#define rall(a) a.rbegin(), a.rend()
#define ll long long
#define ld long double

struct P{
    ll x, y;
};

void dbg_out() { cerr << endl; }
template <typename H, typename... T>
void dbg_out(H h, T... t) { cerr << ' ' << h; dbg_out(t...); }
#define dbg(...) { cerr << #__VA_ARGS__ << ':'; dbg_out(__VA_ARGS__); }

ld border(ld x, ld y, ld a, ld b){
    return (a*a + b*b - x*x - y*y) / (2*a - 2*x);
}

ld dist(ld x, ld y, ld point){
    return sqrtl(y*y + (point-x)*(point-x));
}

signed main(){
    fastio;
    int n, r;
    cin >> n >> r;
    stack<pair<int, int>> st;
    int a, b, x, y;
    for (int i=0; i<n; i++){
        cin >> a >> b;
        if (b < 0) b = -b;
        
        while (!st.empty() && st.top().first == a && st.top().second > b) st.pop();

        while ((int)st.size() > 1){
            tie(x, y) = st.top();
            st.pop();

            // if prev is not a useless point, put it back and stop
            if (border(x, y, a, b) > border(st.top().first, st.top().second, x, y)){
                st.push({x, y});
                break;
            }
        }

        st.push({a, b});
    }
    ld ans=0;
    ld right=r;
    while ((int)st.size() > 1){
        tie(a, b) = st.top();
        st.pop();
        tie(x, y) = st.top();
        ld left = border(x, y, a, b);
        if (left >= right) continue;
        if (right >= 0 && right <= r) ans = max(ans, dist(a, b, right));
        if (left >= 0 && left <= r) ans = max(ans, dist(a, b, left));
        right = left;
    }
    tie(a, b) = st.top();
    if (right >= 0) {
        ans = max(ans, dist(a, b, right));
        ans = max(ans, dist(a, b, 0));
    }
    cout << fixed << setprecision(13);
    cout << ans << '\n';
}

Subtask #1
4.0 / 4.0

#	Verdict	Memory	Grader output
1	Correct	348 KB	Output is correct
2	Correct	348 KB	Output is correct
3	Correct	456 KB	Output is correct
4	Correct	348 KB	Output is correct

Subtask #2
0 / 4.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	0 ms	348 KB	Output is correct
2	Incorrect	1 ms	348 KB	Output isn't correct
3	Halted	0 ms	0 KB	-

Subtask #3
4.0 / 4.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	1 ms	348 KB	Output is correct
2	Correct	1 ms	344 KB	Output is correct
3	Correct	0 ms	348 KB	Output is correct
4	Correct	1 ms	348 KB	Output is correct

Subtask #4
0 / 4.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	1 ms	344 KB	Output is correct
2	Correct	1 ms	348 KB	Output is correct
3	Incorrect	1 ms	348 KB	Output isn't correct
4	Halted	0 ms	0 KB	-

Subtask #5
4.0 / 4.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	1 ms	348 KB	Output is correct
2	Correct	1 ms	348 KB	Output is correct
3	Correct	1 ms	348 KB	Output is correct
4	Correct	1 ms	348 KB	Output is correct

Subtask #6
0 / 5.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	1 ms	348 KB	Output is correct
2	Correct	1 ms	348 KB	Output is correct
3	Incorrect	1 ms	348 KB	Output isn't correct
4	Halted	0 ms	0 KB	-

Subtask #7
0 / 5.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	11 ms	1112 KB	Output is correct
2	Incorrect	11 ms	1464 KB	Output isn't correct
3	Halted	0 ms	0 KB	-

Subtask #8
5.0 / 5.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	11 ms	1116 KB	Output is correct
2	Correct	11 ms	1116 KB	Output is correct
3	Correct	13 ms	1368 KB	Output is correct
4	Correct	14 ms	1628 KB	Output is correct
5	Correct	15 ms	1884 KB	Output is correct

Subtask #9
0 / 5.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	12 ms	1748 KB	Output is correct
2	Incorrect	12 ms	1372 KB	Output isn't correct
3	Halted	0 ms	0 KB	-

Subtask #10
0 / 5.0

#	Verdict	Execution time	Memory	Grader output
1	Incorrect	17 ms	1848 KB	Output isn't correct
2	Halted	0 ms	0 KB	-

Subtask #11
0 / 5.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	16 ms	2244 KB	Output is correct
2	Incorrect	16 ms	1632 KB	Output isn't correct
3	Halted	0 ms	0 KB	-

Subtask #12
5.0 / 5.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	69 ms	8632 KB	Output is correct
2	Correct	99 ms	7964 KB	Output is correct
3	Correct	73 ms	7512 KB	Output is correct
4	Correct	93 ms	9808 KB	Output is correct
5	Correct	84 ms	7252 KB	Output is correct

Subtask #13
5.0 / 5.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	78 ms	9044 KB	Output is correct
2	Correct	74 ms	7468 KB	Output is correct
3	Correct	67 ms	6736 KB	Output is correct
4	Correct	93 ms	9556 KB	Output is correct
5	Correct	83 ms	7504 KB	Output is correct

Subtask #14
0 / 5.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	82 ms	10324 KB	Output is correct
2	Incorrect	87 ms	9628 KB	Output isn't correct
3	Halted	0 ms	0 KB	-

Subtask #15
0 / 5.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	91 ms	10064 KB	Output is correct
2	Correct	92 ms	8792 KB	Output is correct
3	Incorrect	91 ms	7632 KB	Output isn't correct
4	Halted	0 ms	0 KB	-

Subtask #16
0 / 5.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	92 ms	12112 KB	Output is correct
2	Incorrect	102 ms	11204 KB	Output isn't correct
3	Halted	0 ms	0 KB	-

Subtask #17
0 / 5.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	108 ms	11820 KB	Output is correct
2	Correct	118 ms	9936 KB	Output is correct
3	Incorrect	102 ms	9776 KB	Output isn't correct
4	Halted	0 ms	0 KB	-

Subtask #18
0 / 5.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	106 ms	13860 KB	Output is correct
2	Incorrect	121 ms	12624 KB	Output isn't correct
3	Halted	0 ms	0 KB	-

Subtask #19
0 / 5.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	122 ms	13392 KB	Output is correct
2	Correct	142 ms	11492 KB	Output is correct
3	Incorrect	109 ms	10840 KB	Output isn't correct
4	Halted	0 ms	0 KB	-

Subtask #20
0 / 5.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	138 ms	17120 KB	Output is correct
2	Incorrect	144 ms	15776 KB	Output isn't correct
3	Halted	0 ms	0 KB	-

Subtask #21
5.0 / 5.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	156 ms	16724 KB	Output is correct
2	Correct	147 ms	14152 KB	Output is correct
3	Correct	142 ms	13904 KB	Output is correct
4	Correct	214 ms	19540 KB	Output is correct
5	Correct	171 ms	14932 KB	Output is correct

Submission #1063921

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