Submission #425118

#	Time	Username	Problem	Language	Result	Execution time	Memory
425118		TryMax	Vision Program (IOI19_vision)	C++17	Compilation error	0 ms	0 KiB

vision

#include<bits/stdc++.h>

//#pragma GCC optimize("O3")
//#pragma GCC optimize("Ofast")
//#pragma GCC optimize("unroll-loops")

using namespace std;

#define f first
#define s second
#define ll long long
#define pb push_back
#define ld long double

const int N = 1e5 + 10, mod = 1e9 + 7, T = 2000 + 10;
const ld eps = 0.9, e = 2.7, minT = 0.00001;

mt19937 rnd(time(NULL));
int n;
vector<pair<int, int>> a, ans;

int res(vector<pair<int, int>> & a){
    pair<int, int> was = {0, 0}, last = {0, 0};
    vector<pair<int, int>> res;
    for(int i = 0; i < n; ++i){
        pair<int, int> now = {a[i].f - last.f, a[i].s - last.s};
        if(now.f * was.f > 0){
            res.pb({a[i].f, last.s});
            was = {0, now.s};
        }else if(now.s * was.s > 0){
            res.pb({last.f, a[i].s});
            was = {now.f, 0};
        }else{
            if(last.f != 0 || last.s != 0)
                res.pb(last);
            pair<int, int> nxt = {a[i + 1].f - a[i].f, a[i + 1].s - a[i].s};
            if(nxt.f * now.f > 0){
                res.pb({last.f, a[i].s});
                was = {now.f, 0};
            }else{
                res.pb({a[i].f, last.s});
                was = {0, now.s};
            }
        }
        last = a[i];
    }
    res.pb(a[n - 1]);
    if(res.size() < ans.size() || ans.empty())
        ans = res;
    return res.size();
}

bool chance(ld c){
    int maxn = 1000000;
    ld num = (ld)(rnd() % maxn) / (maxn - 1);
    return num <= c;
}

signed main(){
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
//    freopen("08.in", "r", stdin);
//    freopen("08.txt", "w", stdout);
    cin >> n;
    a.resize(n);
    for(int i = 0; i < n; ++i)
        cin >> a[i].f >> a[i].s;
    sort(a.begin(), a.end());
    int now = res(a);
    ld t = T;
    while(t > minT){
//        cout << t << endl;
        int l = rnd() % n;
        int r = rnd() % n;
        swap(a[l], a[r]);
        int nres = res(a);
        if(nres < now || !chance(pow(e, (nres - now) / t)))
            swap(a[l], a[r]);
        t *= eps;
    }
    cout << ans.size() << "\n";
    for(auto v : ans)
        cout << v.f << " " << v.s << endl;
}

Compilation message (stderr)

/usr/bin/ld: /tmp/ccjFkFYs.o: in function `main':
grader.cpp:(.text.startup+0x0): multiple definition of `main'; /tmp/ccRQuLPv.o:vision.cpp:(.text.startup+0x0): first defined here
/usr/bin/ld: /tmp/ccjFkFYs.o: in function `main':
grader.cpp:(.text.startup+0x1b3): undefined reference to `construct_network(int, int, int)'
collect2: error: ld returned 1 exit status