Submission #402151

#	Time	Username	Problem	Language	Result	Execution time	Memory
402151		teehandsome	Circle selection (APIO18_circle_selection)	C++17	0 / 100	349 ms	36716 KiB

circle_selection

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#define endl '\n'
#define INF 1e9+7
#define all(x) x.begin(),x.end()
using namespace std;
using namespace __gnu_pbds;
using ll=long long;
using pii=pair<int,int>;
using ppi=pair<int,pii>;
using oset=tree<int,null_type,less<int>,rb_tree_tag,tree_order_statistics_node_update>;

template<typename T>
void _print(vector<T> x) {cerr<<"{"; for(auto e:x) cerr<<e<<","; cerr<<"}";}
void _print(pii x) {cerr<<"{"<<x.first<<","<<x.second<<"}";}
template<typename T>
void _print(T x) {cerr<<x;}

void dbg() {cerr<<endl;}
template<typename Head,typename... Tail>
void dbg(Head H,Tail... T) {
    _print(H);
    if(sizeof...(T)) cerr<<",";
    else cerr<<"\"]";
    dbg(T...);
}
#define debug(...) cerr<<"["<<#__VA_ARGS__<<"]:[\"",dbg(__VA_ARGS__)

//mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());

struct dt {
    ll x,y,r;
    int idx;
    bool intersect(const dt &aa) {
        return abs(aa.x-x)<=r+aa.r;
//        return (x-aa.x)*(x-aa.x)+(y-aa.y)*(y-aa.y)<=(r+aa.r)*(r+aa.r);
    }
    bool operator<(const dt &aa) {
        return r<aa.r;
    }
};

bool operator>(const dt &aa,const dt &bb) {
        if(aa.r==bb.r) return aa.x<bb.x;
        return aa.r>bb.r;
}

bool same[5010][5010];

void deebug(vector<dt> ar) {
    cout<<"----"<<endl;
    int len=ar.size();
    for(int i=0;i<len;i++) {
        cout<<ar[i].x<<" "<<ar[i].y<<" "<<ar[i].r<<endl;
    }
    cout<<"===="<<endl;
}
bool cmp2(const dt &l,const dt &r) {
    return (l.x-l.r)<(r.x-r.r);
}
bool cmp3(const dt &l,const dt &r) {
    return (l.x+l.r)<(r.x+r.r);
}

int main () {
    ios::sync_with_stdio(false); cin.tie(0);
    int n; cin>>n;
    vector<dt> a(n),a2(n),a3(n);
    for(int i=0;i<n;i++) cin>>a[i].x>>a[i].y>>a[i].r,a[i].idx=i;
    a2=a; a3=a;
    sort(all(a),greater<dt>());
    sort(all(a2),cmp2);
    sort(all(a3),cmp3);
    vector<int> toA(n),toA2(n),toA3(n);
    vector<int> ans(n,-1);

    for(int i=0;i<n;i++) {
        toA[a[i].idx]=i;
        toA2[a2[i].idx]=i;
        toA3[a3[i].idx]=i;
    }
    for(int i=0;i<n;i++) {
        int idx=a[i].idx;
        int u=idx;
        if(ans[u]!=-1) continue;
        ans[u]=u;
        int idx2=toA2[idx];
        int idx3=toA3[idx];
        int p1=lower_bound(all(a2),a[i],cmp2)-begin(a2)-1;
        int p2=lower_bound(all(a3),a[i],cmp3)-begin(a3)+1;
        while(p1>=0 and a[i].intersect(a3[p1])) {
            int v=a3[p1].idx;
            if(ans[v]!=-1) break;
            ans[v]=u; --p1;
        }
        while(p2<n and a[i].intersect(a2[p2])) {
            int v=a2[p2].idx;
            if(ans[v]!=-1) break;
            ans[v]=u; ++p2;
        }

    }
//    deebug(a2);
//    deebug(a3);
    for(int i=0;i<n;i++) cout<<ans[i]+1<<" "; cout<<endl;
}

Compilation message (stderr)

circle_selection.cpp: In function 'int main()':
circle_selection.cpp:88:13: warning: unused variable 'idx2' [-Wunused-variable]
   88 |         int idx2=toA2[idx];
      |             ^~~~
circle_selection.cpp:89:13: warning: unused variable 'idx3' [-Wunused-variable]
   89 |         int idx3=toA3[idx];
      |             ^~~~
circle_selection.cpp:106:5: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
  106 |     for(int i=0;i<n;i++) cout<<ans[i]+1<<" "; cout<<endl;
      |     ^~~
circle_selection.cpp:106:47: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
  106 |     for(int i=0;i<n;i++) cout<<ans[i]+1<<" "; cout<<endl;
      |                                               ^~~~

• Subtask 1: 0 / 7
• Subtask 2: 0 / 12
• Subtask 3: 0 / 15
• Subtask 4: 0 / 23
• Subtask 5: 0 / 30
• Subtask 6: 0 / 13