답안 #243158

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
243158 2020-06-30T12:50:49 Z VEGAnn Svjetlost (COI18_svjetlost) C++14
69 / 100
1454 ms 52364 KB
#include <bits/stdc++.h>
#define sz(x) ((int)x.size())
#define all(x) x.begin(),x.end()
#define PB push_back
using namespace std;
typedef long double ld;
const int N = 400100;
const ld E = 1e-9;
const ld pi = 3.1415926535897;
vector<ld> vc;
int n, pr[N], nt[N], x[N], y[N], nm[N], q;
ld st[4 * N], psh[4 * N];

ld sqr(ld xx) { return xx * xx;}

ld dist(ld x1, ld y1, ld x2, ld y2){
    return sqrt(sqr(x1 - x2) + sqr(y1 - y2));
}

void add(int i, int j){
    ld nw_x = x[j] - x[i];
    ld nw_y = y[j] - y[i];

    ld ang = atan2(nw_y, nw_x);

    if (ang < 0) ang += pi + pi;

    vc.PB(ang);

    ang += pi;

    if (ang >= pi + pi)
        ang -= pi + pi;

    vc.PB(ang);
}

void push(int v){
    if (psh[v] != 0){
        st[v] += psh[v];

        if (v + v + 1 < 4 * N){
            psh[v + v] += psh[v];
            psh[v + v + 1] += psh[v];
        }

        psh[v] = 0;
    }
}

void update(int v, int tl, int tr, int l, int r, ld val){
    push(v);

    if (l > r) return;

    if (tl == l && tr == r) {
        psh[v] += val;
        push(v);
        return;
    }

    int md = (tl + tr) >> 1;

    update(v + v, tl, md, l, min(r, md), val);
    update(v + v + 1, md + 1, tr, max(md + 1, l), r, val);

    st[v] = max(st[v + v], st[v + v + 1]);
}

void add_seg(int i, int j, ld val){
    ld nw_x = x[j] - x[i];
    ld nw_y = y[j] - y[i];

    ld ang = atan2(nw_y, nw_x);

    if (ang < 0) ang += pi + pi;

    int lf = lower_bound(all(vc), ang - E) - vc.begin();

    ang += pi;

    if (ang >= pi + pi)
        ang -= pi + pi;

    int rt = lower_bound(all(vc), ang - E) - vc.begin() - 1;

    if (vc[rt] + E > ang) {
        rt--;
        if (rt < 0)
            rt = sz(vc) - 1;
    }

    if (rt < 0) rt = sz(vc) - 1;

    if (lf <= rt){
        update(1, 0, sz(vc) - 1, lf, rt, val);
    } else {
        update(1, 0, sz(vc) - 1, lf, sz(vc) - 1, val);
        update(1, 0, sz(vc) - 1, 0, rt, val);
    }
}

int main(){
    ios_base::sync_with_stdio(0); cin.tie(0);

#ifdef _LOCAL
    freopen("in.txt","r",stdin);
#endif // _LOCAL

    cin >> n;

    for (int i = 0; i < n; i++) {
        cin >> x[i] >> y[i];
        pr[i] = (i - 1 + n) % n;
        nt[i] = (i + 1) % n;
    }

    for (int i = 0; i < n; i++)
        add(i, nt[i]);

    cin >> q;

    for (int i = 0; i < q; i++){
        cin >> nm[i]; nm[i]--;

        int id = nm[i];

        pr[nt[id]] = pr[id];
        nt[pr[id]] = nt[id];

        add(pr[id], nt[id]);
    }

    sort(all(vc));

    int cnt = 1;

    for (int i = 1; i < sz(vc); i++)
        if (abs(vc[i] - vc[i - 1]) > E)
            vc[cnt++] = vc[i];

    vc.resize(cnt);

    for (int i = 0; i < n; i++){
        pr[i] = (i - 1 + n) % n;
        nt[i] = (i + 1) % n;
        add_seg(i, nt[i], dist(x[i], y[i], x[nt[i]], y[nt[i]]));
    }
    cout << fixed << setprecision(10) << st[1] << '\n';

    for (int i = 0; i < q; i++){
        int id = nm[i];

        add_seg(pr[id], id, -dist(x[pr[id]], y[pr[id]], x[id], y[id]));
        add_seg(id, nt[id], -dist(x[id], y[id], x[nt[id]], y[nt[id]]));

        pr[nt[id]] = pr[id];
        nt[pr[id]] = nt[id];

        add_seg(pr[id], nt[id], dist(x[pr[id]], y[pr[id]], x[nt[id]], y[nt[id]]));

        cout << fixed << setprecision(10) << st[1] << '\n';
    }

    return 0;
}
# 결과 실행 시간 메모리 Grader output
1 Correct 5 ms 384 KB 11 numbers
2 Correct 5 ms 384 KB 41 numbers
3 Correct 5 ms 384 KB 11 numbers
4 Correct 5 ms 384 KB 93 numbers
# 결과 실행 시간 메모리 Grader output
1 Correct 5 ms 384 KB 11 numbers
2 Correct 5 ms 384 KB 41 numbers
3 Correct 5 ms 384 KB 11 numbers
4 Correct 5 ms 384 KB 93 numbers
5 Correct 7 ms 896 KB 101 numbers
6 Correct 15 ms 1408 KB 1201 numbers
7 Correct 18 ms 1408 KB 1556 numbers
8 Correct 23 ms 1536 KB 1996 numbers
9 Correct 22 ms 1536 KB 1960 numbers
10 Correct 21 ms 1536 KB 1991 numbers
11 Correct 22 ms 1536 KB 1963 numbers
# 결과 실행 시간 메모리 Grader output
1 Correct 5 ms 384 KB found '32934.3604541195', expected '32934.3604541195', error '0.0000000000'
2 Correct 8 ms 896 KB found '31571636.3365447670', expected '31571636.3365447633', error '0.0000000000'
3 Correct 32 ms 4092 KB found '31442617.6286691166', expected '31442617.6286691241', error '0.0000000000'
4 Correct 54 ms 7664 KB found '31424400.0534066260', expected '31424400.0534067489', error '0.0000000000'
5 Correct 249 ms 29152 KB found '3142086769.6889743805', expected '3142086769.6889681816', error '0.0000000000'
6 Correct 232 ms 29156 KB found '3142076120.8714599609', expected '3142076120.8714694977', error '0.0000000000'
# 결과 실행 시간 메모리 Grader output
1 Correct 15 ms 1408 KB 1001 numbers
2 Correct 178 ms 14824 KB 15001 numbers
3 Correct 465 ms 30176 KB 44445 numbers
4 Correct 399 ms 30560 KB 22223 numbers
5 Correct 915 ms 51796 KB 88889 numbers
# 결과 실행 시간 메모리 Grader output
1 Correct 5 ms 384 KB 11 numbers
2 Correct 5 ms 384 KB 41 numbers
3 Correct 5 ms 384 KB 11 numbers
4 Correct 5 ms 384 KB 93 numbers
5 Correct 7 ms 896 KB 101 numbers
6 Correct 15 ms 1408 KB 1201 numbers
7 Correct 18 ms 1408 KB 1556 numbers
8 Correct 23 ms 1536 KB 1996 numbers
9 Correct 22 ms 1536 KB 1960 numbers
10 Correct 21 ms 1536 KB 1991 numbers
11 Correct 22 ms 1536 KB 1963 numbers
12 Correct 5 ms 384 KB found '32934.3604541195', expected '32934.3604541195', error '0.0000000000'
13 Correct 8 ms 896 KB found '31571636.3365447670', expected '31571636.3365447633', error '0.0000000000'
14 Correct 32 ms 4092 KB found '31442617.6286691166', expected '31442617.6286691241', error '0.0000000000'
15 Correct 54 ms 7664 KB found '31424400.0534066260', expected '31424400.0534067489', error '0.0000000000'
16 Correct 249 ms 29152 KB found '3142086769.6889743805', expected '3142086769.6889681816', error '0.0000000000'
17 Correct 232 ms 29156 KB found '3142076120.8714599609', expected '3142076120.8714694977', error '0.0000000000'
18 Correct 15 ms 1408 KB 1001 numbers
19 Correct 178 ms 14824 KB 15001 numbers
20 Correct 465 ms 30176 KB 44445 numbers
21 Correct 399 ms 30560 KB 22223 numbers
22 Correct 915 ms 51796 KB 88889 numbers
23 Correct 1454 ms 52268 KB 98175 numbers
24 Correct 315 ms 15468 KB 25905 numbers
25 Correct 1157 ms 52364 KB 98169 numbers
26 Incorrect 1110 ms 51652 KB 40842nd numbers differ - expected: '3728194663.4741077423', found: '3728119835.3530573845', error = '0.0000200709'
27 Halted 0 ms 0 KB -