Submission #624243

#	Time	Username	Problem	Language	Result	Execution time	Memory
624243		Vladth11	Roads (CEOI20_roads)	C++14	0 / 100	4 ms	852 KiB

roads

#include <bits/stdc++.h>
#define C 1
#define P 0
#define debug(x) cerr << #x << " " << x << "\n"
#define debugs(x) cerr << #x << " " << x << " "

using namespace std;
typedef long long ll;
typedef pair <long double, long double> pii;

const ll NMAX = 100001;
const ll VMAX = 101;
const ll INF = (1LL << 60);
const ll MOD = 1000000007;
const ll BLOCK = 447;
const ll base = 117;
const ll nr_of_bits = 18;
const ll inv2 = 500000004;

map <pii, pii> mp;
pii v[NMAX * 2];

struct ura{
    pii a, b;
};

const long double pi = 3.14159265358979323846;

vector <ura> sol;
map <pii, bool> scutit;
long double slope = 1;

bool mic(pii a, pii b){
    return a < b;
}

bool cmp(pii a, pii b){
    return (mic(a, b));
}

long double dd(pii a, pii b){
    return sqrt((a.first - b.first) * (a.first - b.first) + (a.second - b.second) * (a.second - b.second));
}

map <pii, pair <int, int> > cine;

long double tg(long double x){
  return sin(x) / cos(x);
}

pii roteste(pii x, long double angle){
    long double cine = pi / 2.0;
    if(angle < cine){
        angle = cine / 2 - angle;
    }
    return {x.first * cos(angle) - x.second * sin(angle), x.first * sin(angle) + x.second * cos(angle)};
}

int main() {
    //ifstream cin(".in");
    //ofstream cout(".out");
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
    int n, i;
    cin >> n;
    for(i = 1; i <= n; i++){
        pii a, b;
        cin >> a.first >> a.second >> b.first >> b.second;
      if(mic(a, b))
            swap(a, b);
        if(b.first != a.first){
            slope =  (a.second - b.second) / (a.first - b.first);
        }
        pii d;
      long double distanta = dd(a, b);
      	pii mijloc = {(a.first + b.first) / 2.0, (a.second + b.second) / 2.0};
        d = roteste(a, slope);
        cine[d] = a;
        a = d;
        v[i] = a;
        pii c = roteste(b, slope);
        cine[c] = b;
        b = c;
        mp[a] = b;
        mp[b] = a;
    }
    sort(v + 1, v + n + 1, cmp);
    for(i = 1; i < n; i++){
        sol.push_back({v[i], mp[v[i + 1]]});
    }
    for(auto x : sol){
        cout << cine[x.a].first << " " << cine[x.a].second << " " << cine[x.b].first << " " << cine[x.b].second << "\n";
    }
    return 0;
}

Compilation message (stderr)

roads.cpp: In function 'int main()':
roads.cpp:76:19: warning: unused variable 'distanta' [-Wunused-variable]
   76 |       long double distanta = dd(a, b);
      |                   ^~~~~~~~
roads.cpp:77:12: warning: variable 'mijloc' set but not used [-Wunused-but-set-variable]
   77 |        pii mijloc = {(a.first + b.first) / 2.0, (a.second + b.second) / 2.0};
      |            ^~~~~~

• Subtask 1: 0 / 0
• Subtask 2: 0 / 15
• Subtask 3: 0 / 15
• Subtask 4: 0 / 15
• Subtask 5: 0 / 15
• Subtask 6: 0 / 40