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Submission #586664

# Submission time Handle Problem Language Result Execution time Memory
586664 2022-06-30T14:12:51 Z krit3379 Park (BOI16_park) C++17
100 / 100
 658 ms 70364 KB 
#include<bits/stdc++.h>
using namespace std;
#pragma GCC optimize("O3,unroll-loops")
#pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")
#define N 2005

struct A{
    long long a,b,r,st;
    bool operator<(const A& o)const{
        return r<o.r;
    }
};

struct B{
    long long r,e,id;
    bool operator<(const B& o)const{
        return r<o.r;
    }
};

int p[N],bit[N],ans[100005];
long long x[N],y[N],r[N];
vector<A> edge;
vector<B> op;
bitset<20> vis,ok[5];

int fp(int v){return v==p[v]?v:p[v]=fp(p[v]);}

int dis(int i,int j){
    long long a=x[i]-x[j],b=y[i]-y[j],c=a*a+b*b,ll,rr,mid,d;
    ll=1,rr=1e9;
    while(ll<=rr){
        mid=(ll+rr)/2;
        if(mid*mid<=c)d=mid,ll=mid+1;
        else rr=mid-1;
    }
    return d-r[i]-r[j];
}

void add(int id){
    auto [a,b,r,st]=edge[id];
    if(!st){
        bit[fp(a)]|=bit[fp(b)];
        p[fp(b)]=fp(a);
    }
    else bit[fp(a)]|=st;
    if(!vis[bit[fp(a)]]){
        int i,j;
        b=bit[fp(a)];
        vis[bit[fp(a)]]=true;
        for(i=0;i<4;i++){
            if((b&(1<<i))&&(b&(1<<((i+1)%4)))){
                for(j=0;j<4;j++){
                    if(i!=j)ok[i+1][j+1]=ok[j+1][i+1]=false;
                }
            }
        }
        if((b&1)&&(b&4))ok[1][4]=ok[4][1]=ok[1][3]=ok[3][1]=ok[4][2]=ok[2][4]=ok[2][3]=ok[3][2]=false;
        if((b&2)&&(b&8))ok[1][2]=ok[2][1]=ok[1][3]=ok[3][1]=ok[4][2]=ok[2][4]=ok[4][3]=ok[3][4]=false;
    }
}

int main(){
    int n,m,w,h,i,j,now,val;
    long long radius,e;
    scanf("%d %d %d %d",&n,&m,&w,&h);
    iota(p,p+n+1,0);
    for(i=1;i<=n;i++){
        scanf("%lld %lld %lld",&x[i],&y[i],&r[i]);
    }
    for(i=1;i<=n;i++){
        for(j=i+1;j<=n;j++){
            edge.push_back({i,j,dis(i,j),0});
        }
    }
    for(i=1;i<=n;i++){
        edge.push_back({i,0,x[i]-r[i],1});
        edge.push_back({i,0,y[i]-r[i],2});
        edge.push_back({i,0,w-x[i]-r[i],4});
        edge.push_back({i,0,h-y[i]-r[i],8});
    }
    for(i=1;i<=4;i++)for(j=1;j<=4;j++)ok[i][j]=true;
    sort(edge.begin(),edge.end());
    for(i=1;i<=m;i++)scanf("%lld %lld",&radius,&e),op.push_back({2*radius,e,i});
    sort(op.begin(),op.end());
    now=0;
    for(auto [rad,e,id]:op){
        while(now<edge.size()&&edge[now].r<rad)add(now++);
        val=0;
        for(i=1;i<=4;i++)if(ok[e][i])val=val*10+i;
        ans[id]=val;
    }
    for(i=1;i<=m;i++)printf("%d\n",ans[i]);
    return 0;
}
/*
5 3
16 11
11 8 1
6 10 1
7 3 2
10 4 1
15 5 1
1 1
2 2
2 1
*/

Compilation message

park.cpp: In function 'int main()':
park.cpp:88:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<A>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   88 |         while(now<edge.size()&&edge[now].r<rad)add(now++);
      |               ~~~^~~~~~~~~~~~
park.cpp:66:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   66 |     scanf("%d %d %d %d",&n,&m,&w,&h);
      |     ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~
park.cpp:69:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   69 |         scanf("%lld %lld %lld",&x[i],&y[i],&r[i]);
      |         ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
park.cpp:84:27: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   84 |     for(i=1;i<=m;i++)scanf("%lld %lld",&radius,&e),op.push_back({2*radius,e,i});
      |                      ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
park.cpp: In function 'int dis(int, int)':
park.cpp:37:13: warning: 'd' may be used uninitialized in this function [-Wmaybe-uninitialized]
   37 |     return d-r[i]-r[j];
      |            ~^~~~~
park.cpp: In function 'int main()':
park.cpp:37:13: warning: 'd' may be used uninitialized in this function [-Wmaybe-uninitialized]
   37 |     return d-r[i]-r[j];
      |            ~^~~~~
park.cpp:30:59: note: 'd' was declared here
   30 |     long long a=x[i]-x[j],b=y[i]-y[j],c=a*a+b*b,ll,rr,mid,d;
      |                                                           ^

Subtask #1
27.0 / 27.0

# Verdict Execution time Memory Grader output
1 Correct 624 ms 66276 KB Output is correct
2 Correct 650 ms 66148 KB Output is correct
3 Correct 621 ms 66148 KB Output is correct
4 Correct 611 ms 66112 KB Output is correct
5 Correct 607 ms 66048 KB Output is correct
6 Correct 614 ms 66196 KB Output is correct
7 Correct 599 ms 66080 KB Output is correct
8 Correct 577 ms 66032 KB Output is correct
9 Correct 0 ms 212 KB Output is correct
10 Correct 0 ms 212 KB Output is correct

Subtask #2
31.0 / 31.0

# Verdict Execution time Memory Grader output
1 Correct 48 ms 4804 KB Output is correct
2 Correct 53 ms 4812 KB Output is correct
3 Correct 47 ms 4804 KB Output is correct
4 Correct 43 ms 4804 KB Output is correct
5 Correct 50 ms 4804 KB Output is correct
6 Correct 45 ms 4836 KB Output is correct
7 Correct 38 ms 3528 KB Output is correct
8 Correct 40 ms 4608 KB Output is correct

Subtask #3
42.0 / 42.0

# Verdict Execution time Memory Grader output
1 Correct 624 ms 66276 KB Output is correct
2 Correct 650 ms 66148 KB Output is correct
3 Correct 621 ms 66148 KB Output is correct
4 Correct 611 ms 66112 KB Output is correct
5 Correct 607 ms 66048 KB Output is correct
6 Correct 614 ms 66196 KB Output is correct
7 Correct 599 ms 66080 KB Output is correct
8 Correct 577 ms 66032 KB Output is correct
9 Correct 0 ms 212 KB Output is correct
10 Correct 0 ms 212 KB Output is correct
11 Correct 48 ms 4804 KB Output is correct
12 Correct 53 ms 4812 KB Output is correct
13 Correct 47 ms 4804 KB Output is correct
14 Correct 43 ms 4804 KB Output is correct
15 Correct 50 ms 4804 KB Output is correct
16 Correct 45 ms 4836 KB Output is correct
17 Correct 38 ms 3528 KB Output is correct
18 Correct 40 ms 4608 KB Output is correct
19 Correct 653 ms 70360 KB Output is correct
20 Correct 658 ms 70348 KB Output is correct
21 Correct 644 ms 70364 KB Output is correct
22 Correct 641 ms 70232 KB Output is correct
23 Correct 655 ms 70332 KB Output is correct
24 Correct 641 ms 70352 KB Output is correct