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QOJ
ID | 题目 | 提交者 | 结果 | 用时 | 内存 | 语言 | 文件大小 | 提交时间 | 测评时间 |
---|---|---|---|---|---|---|---|---|---|
#775665 | #7860. Graph of Maximum Degree 3 | 123456zmy# | RE | 2ms | 6568kb | C++14 | 2.0kb | 2024-11-23 16:26:32 | 2024-11-23 16:26:33 |
Judging History
answer
#include<bits/stdc++.h>
#define pb push_back
using namespace std;
int n,m,x,y,z;
int ans;
int du[100001];
struct yu
{
int x,y;
bool operator<(const yu &a)const
{
return a.x<x||(a.x==x&&a.y<y);
}
};
vector<yu>e[100001];
map<yu,int>A;
int main()
{
scanf("%d %d",&n,&m);
for (int i=1;i<=m;i++)
{
scanf("%d %d %d",&x,&y,&z);
if (x>y)swap(x,y);
z++;
if (A.count((yu){x,y}))A[(yu){x,y}]+=z;
else A[(yu){x,y}]=z;
}
ans=n;
for (auto [i,j]:A)
{
if (j==3)ans++;
e[i.x].pb((yu){i.y,j}),du[i.y]++;
e[i.y].pb((yu){i.x,j}),du[i.x]++;
}
for (auto [i,j]:A)if (j==3)
{
int x=i.x,y=i.y;
yu o,p;
for (yu I:e[x])if (I.x!=y)o=(yu){I.x,I.y};
for (yu I:e[y])if (I.x!=x)p=(yu){I.x,I.y};
if (o.x==p.x&&o.y!=p.y)ans++;
}
int ank=0;
for (auto [i,j]:A)if (j==3)
{
int x=i.x,y=i.y;
yu o,p;
for (yu I:e[x])if (I.x!=y)o=(yu){I.x,I.y};
for (yu I:e[y])if (I.x!=x)p=(yu){I.x,I.y};
if (o.x!=p.x&&o.y!=p.y)
{
if (e[o.x].size()==2&&e[p.x].size()==2)
{
yu u,v;
for (yu I:e[o.x])if (I.x!=x)u=(yu){I.x,I.y};
for (yu I:e[p.x])if (I.x!=y)v=(yu){I.x,I.y};
if (u.x==p.x&&v.x==o.x&&u.y==3&&v.y==3)ank++;
}
}
}
int ano=0;
for (int i=1;i<=n;i++)if (du[i]==3)
{
int l=0,r=0;
if (e[i][0].y+e[i][1].y+e[i][2].y==4)l++;else if (e[i][0].y+e[i][1].y+e[i][2].y==5)r++;
vector<yu>b;
for (yu j:e[i])b.pb(j);
if (du[b[0].x]!=3||du[b[1].x]!=3||du[b[2].x]!=3)continue;
for (yu k:b)
{
int ii=k.x;
if (e[ii][0].y+e[ii][1].y+e[ii][2].y==4)l++;else if (e[ii][0].y+e[ii][1].y+e[ii][2].y==5)r++;
}
if (l==2&&r==2)ano++;
}
printf("%d\n",ans+ank/2+ano/4);
}
詳細信息
Test #1:
score: 100
Accepted
time: 2ms
memory: 6372kb
input:
3 4 1 2 0 1 3 1 2 3 0 2 3 1
output:
5
result:
ok 1 number(s): "5"
Test #2:
score: 0
Accepted
time: 2ms
memory: 6568kb
input:
4 6 1 2 0 2 3 0 3 4 0 1 4 1 2 4 1 1 3 1
output:
5
result:
ok 1 number(s): "5"
Test #3:
score: -100
Runtime Error
input:
20 28 9 6 1 9 6 0 3 8 0 8 4 0 3 8 1 3 4 1 2 13 0 13 1 0 19 1 0 2 1 1 2 19 1 13 19 1 14 15 1 14 15 0 7 12 0 12 17 0 20 17 0 7 17 1 7 20 1 12 20 1 16 18 0 18 10 0 5 10 0 16 10 1 16 5 1 18 5 1 4 6 0 9 11 0