Submission #474054

#	Time	Username	Problem	Language	Result	Execution time	Memory
474054		idas	Park (BOI16_park)	C++17	100 / 100	1070 ms	87184 KiB

park

#include <bits/stdc++.h>
#define FOR(i, begin, end) for(int i = (begin); i < (end); i++)
#define FAST_IO ios_base::sync_with_stdio(0); cin.tie(nullptr); cout.tie(nullptr)
#define F first
#define S second
#define PB push_back
#define MP make_pair
#define SZ(x) ((int)((x).size()))
#define LE(vec) vec[vec.size()-1]
#define TSTS int t; cin >> t; while(t--)solve()

const int INF = 1e9;
const long long LINF = 1e18;
const long double PI = asin(1)*2;
const int MOD = 1e9+7;

using namespace std;
typedef pair<int, int> pii;
typedef vector<int> vi;
typedef map<int, int> mii;
typedef long long ll;
typedef long double ld;

void setIO()
{
    FAST_IO;
}

void setIO (string s)
{
    setIO();
 	freopen((s+".in").c_str(),"r",stdin);
 	freopen((s+".out").c_str(),"w",stdout);
}

const int N=5e3+10, M=5e5+10;
ll n, m, w, h, par[N];
string ans[M];
vector<pair<ll, pair<ll, ll>>> vis;

int fnd(ll u)
{
    return par[u]=par[u]==u?u:fnd(par[u]);
}

bool same(ll a, ll b)
{
    return fnd(a)==fnd(b);
}

void mrg(ll a, ll b)
{
    a=fnd(a); b=fnd(b);
    if(a==b) return;
    par[a]=b;
}

bool con[10][10];

void out(ll r, ll e, ll idx)
{
    FOR(i, 0, 6) FOR(j, 0, 6) con[i][j]=true;
    if(same(n+3, n+1)){
        con[4][1]=false; con[4][2]=false;
        con[3][1]=false; con[3][2]=false;
    }
    if(same(n, n+2)){
        con[1][3]=false; con[1][2]=false;
        con[4][2]=false; con[4][3]=false;
    }

    //1
    if(same(n+3, n+2)){
        con[1][2]=false; con[1][3]=false; con[1][4]=false;
    }
    //2
    if(same(n+1, n+2)){
        con[2][1]=false; con[2][3]=false; con[2][4]=false;
    }
    //3
    if(same(n, n+1)){
        con[3][1]=false; con[3][2]=false; con[3][4]=false;
    }
    //4
    if(same(n, n+3)){
        con[4][1]=false; con[4][2]=false; con[4][3]=false;
    }

    FOR(i, 0, 5)
    {
        FOR(j, 0, 5)
        {
            con[i][j]=(con[i][j]&&con[j][i]);
        }
    }
}

char toChr(int x)
{
    if(x==0) return '0';
    if(x==1) return '1';
    if(x==2) return '2';
    if(x==3) return '3';
    if(x==4) return '4';
    if(x==5) return '5';
    if(x==6) return '6';
    if(x==7) return '7';
    if(x==8) return '8';
    if(x==9) return '9';
}

void gtAns(int e, int idx)
{
    FOR(i, 1, 5)
    {
        if(con[e][i]) ans[idx]+=toChr(i);
    }
}

void opn()
{
    freopen("t.in", "r", stdin);
    freopen("t.out", "w", stdout);
}

int main()
{
    setIO();
    //opn();
    cin >> n >> m >> w >> h;
    vector<pair<ll, pair<ll, ll>>> in;
    FOR(i, 0, n)
    {
        par[i]=i;
        ll x, y, r;
        cin >> x >> y >> r;
        in.PB({r, {x, y}});
    }
    FOR(i, n, n+4) par[i]=i;
    FOR(i, 0, m)
    {
        ll r, e;
        cin >> r >> e;
        vis.PB({r, {e, i}});
    }

    sort(vis.begin(), vis.end());

    priority_queue<pair<ld, pair<ll, ll>>, vector<pair<ld, pair<ll, ll>>>, greater<pair<ld, pair<ll, ll>>>> pth;
    FOR(i, 0, (int)in.size())
    {
        FOR(j, i+1, (int)in.size())
        {
            ll x=in[i].S.F, y=in[i].S.S, r=in[i].F, z=in[j].S.F, ww=in[j].S.S, l=in[j].F;
            ll dist=(x-z)*(x-z)+(y-ww)*(y-ww);
            ld d=sqrt(dist);
            d-=(ld)(r+l);
            pth.push({d, {i, j}});
        }
        ll x=in[i].S.F, y=in[i].S.S, r=in[i].F;

        pth.push({(h-y-r), {i, n}});
        pth.push({(w-x-r), {i, n+1}});
        pth.push({(y-r), {i, n+2}});
        pth.push({(x-r), {i, n+3}});
    }

    for(auto it : vis){
        ll r=it.F, e=it.S.F, idx=it.S.S;
        while(!pth.empty() && pth.top().F<(ld)2*r){
            mrg(pth.top().S.F, pth.top().S.S);
            pth.pop();
        }
        out(r, e, idx);
        gtAns(e, idx);
    }

    FOR(i, 0, m)
    {
        cout << ans[i] << '\n';
    }
}

Compilation message (stderr)

park.cpp: In function 'void setIO(std::string)':
park.cpp:32:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   32 |   freopen((s+".in").c_str(),"r",stdin);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
park.cpp:33:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   33 |   freopen((s+".out").c_str(),"w",stdout);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
park.cpp: In function 'char toChr(int)':
park.cpp:110:1: warning: control reaches end of non-void function [-Wreturn-type]
  110 | }
      | ^
park.cpp: In function 'void opn()':
park.cpp:122:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  122 |     freopen("t.in", "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~
park.cpp:123:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  123 |     freopen("t.out", "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 27 / 27
• Subtask 2: 31 / 31
• Subtask 3: 42 / 42