Submission #402110

#	Time	Username	Problem	Language	Result	Execution time	Memory
402110		teehandsome	Circle selection (APIO18_circle_selection)	C++11	0 / 100	245 ms	24668 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 (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) {
        return aa.r>bb.r;
}

bool same[5010][5010];

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

    for(int i=0;i<n;i++) {
        toA[a[i].idx]=i;
        toA2[a2[i].idx]=i;
    }
    for(int i=0;i<n;i++) {
        int idx=a[i].idx;
        int idx2=toA2[idx];
        int u=a2[idx2].idx;
        assert(u==idx);
        if(ans[u]!=-1) continue;
        ans[u]=u;
        int l=idx2-1,r=idx2+1;
        while(l>=0 and a2[idx2].intersect(a2[l])) {
            int v=a2[l].idx;
            if(ans[v]!=-1) break;
            ans[v]=u; l--;
        }
        while(r<n and a2[idx2].intersect(a2[r])) {
            int v=a2[r].idx;
            if(ans[v]!=-1) break;
            ans[v]=u; r++;
        }
    }

    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:86:5: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
   86 |     for(int i=0;i<n;i++) cout<<ans[i]+1<<" "; cout<<endl;
      |     ^~~
circle_selection.cpp:86:47: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
   86 |     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