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QOJ
ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#595824 | #7749. A Simple MST Problem | forget-star# | RE | 360ms | 109044kb | C++14 | 1.9kb | 2024-09-28 14:32:28 | 2024-09-28 14:32:28 |
Judging History
answer
#include<iostream>
#include<cstring>
#include<cstdio>
#include<algorithm>
#include<cmath>
#include<map>
#include<vector>
#include<queue>
#include<set>
#include<bitset>
#include<deque>
#include<stack>
#include<unordered_map>
#include<ctime>
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;
const int N=1e6+10;
struct node
{
int x,y,v;
}e[N*10];
int vis[N],f[N];
vector<int>v[N];
int gcd(int x,int y){return y==0?x:gcd(y,x%y);}
int bcj(int x){return f[x]==x?x:f[x]=bcj(f[x]);}
bool cmp(node A,node B){return A.v<B.v;}
int main()
{
for(int i=2;i<=1000000;i++)
if(!vis[i])
{
v[i].push_back(i);
for(int j=i*2;j<=1000000;j+=i)
v[j].push_back(i),vis[j]=1;
}
int T;scanf("%d",&T);
while(T--)
{
int L,R;scanf("%d%d",&L,&R);
if(L==1)
{
int ans=0;
for(int i=2;i<=R;i++) ans+=v[i].size();
printf("%d\n",ans);
continue;
}
int tt=0;
for(int i=L;i<=R;i++)
if(!vis[i]) tt=i;
int ans=0;
if(!tt)
{
for(int i=L;i<=R;i++) f[i]=i;int m=0;
for(int i=L;i<=R;i++)
for(int j=i+1;j<=R;j++)
e[++m]=node{i,j,v[i].size()+v[j].size()-v[gcd(i,j)].size()};
sort(e+1,e+m+1,cmp);
for(int i=1,t=0;i<=m&&t<(R-L);i++)
{
int x=bcj(e[i].x),y=bcj(e[i].y);
if(x==y) continue;
f[x]=y;t++,ans+=e[i].v;
}
}
else
{
for(int i=L;i<=R;i++) f[i]=i;int m=0;
for(int i=L;i<=R;i++)
{
int p=1;
for(int j=0;j<v[i].size();j++) p*=v[i][j];
for(int j=(L+p-1)/p*p;j<=R;j+=p)
if(i!=j) e[++m]=node{i,j,v[j].size()};
}
for(int i=L;i<=R;i++)
if(i!=tt) e[++m]=node{i,tt,v[i].size()+1};
sort(e+1,e+m+1,cmp);
for(int i=1,t=0;i<=m&&t<(R-L);i++)
{
int x=bcj(e[i].x),y=bcj(e[i].y);
if(x==y) continue;
f[x]=y;t++,ans+=e[i].v;
}
}
printf("%d\n",ans);
}
return 0;
}
Details
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Test #1:
score: 100
Accepted
time: 164ms
memory: 65716kb
input:
5 1 1 4 5 1 4 1 9 19 810
output:
0 2 3 9 1812
result:
ok 5 lines
Test #2:
score: 0
Accepted
time: 184ms
memory: 71100kb
input:
2 27 30 183704 252609
output:
8 223092
result:
ok 2 lines
Test #3:
score: 0
Accepted
time: 191ms
memory: 73260kb
input:
1 183704 252609
output:
223092
result:
ok single line: '223092'
Test #4:
score: 0
Accepted
time: 360ms
memory: 109044kb
input:
2 639898 942309 30927 34660
output:
983228 11512
result:
ok 2 lines
Test #5:
score: -100
Runtime Error
input:
3 21731 33468 46192 370315 1712 3753