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QOJ
ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#545035 | #7860. Graph of Maximum Degree 3 | XfJbUhpyzgaW | WA | 3ms | 19280kb | C++14 | 3.4kb | 2024-09-02 22:02:50 | 2024-09-02 22:02:50 |
Judging History
answer
#include<bits/stdc++.h>
#define ll long long
#define N 150010
#define P 998244353
#define GC getchar()
#define PC putchar
using namespace std;
ll re(){
ll s=0,b=1; char c=GC;
while(c>'9'||c<'0'){if(c=='-')b=-b; c=GC;}
while(c<='9'&&c>='0'){s=(s<<1)+(s<<3)+(c^48); c=GC;}
return s*b;
}
void ks(ll s){
if(s<0)PC('-'),s=-s;
if(s>=10)ks(s/10); PC((s%10)|48);
}
int n,m,b[2][N][2],s[2],ds[2][N],vi[N],dl[N],h,t,ytt,yhe[N],x,y,op;
int bh[N],nn,he[N],tt,li[N],cd;
bool V[N];
ll ans;
struct A{int ne,to,co;}yb[N<<3];
struct B{int ne,to;}B[N<<2];
map<int,int>bt[N];
void ad(int x,int y){
B[++tt].to=y; B[tt].ne=he[x]; he[x]=tt;
B[++tt].to=x; B[tt].ne=he[y]; he[y]=tt;
}
void dfs(int x,int f,int zz){
li[++cd]=x; V[x]=1;
for(int i=he[x]; i; i=B[i].ne){
int v=B[i].to; if(v==f)continue;
if(v==zz)op=1; else dfs(v,x,zz);
}
}
void pd2(int x,int y){
if(bt[x][y])ans++;
}
void pd3(int x,int y,int z){
int s=bt[x][y]+bt[y][z]+bt[z][x];
if(s>=2)ans++;
}
void pd4(int x,int y,int z,int a){
int s=bt[x][y]+bt[y][z]+bt[x][z]+bt[x][a]+bt[y][a]+bt[z][a];
//cout<<s<<endl;
if(s>3){ans++;}
if(s==3){
if(bt[x][y]||bt[x][z]||bt[x][a])
if(bt[y][x]||bt[y][z]||bt[y][a])
if(bt[z][x]||bt[z][y]||bt[z][a])
if(bt[a][x]||bt[a][y]||bt[a][z])ans++;
}
}
int main(){
//freopen("a.in","r",stdin);
n=re(),m=re(); ans=n;
for(int i=1; i<=m; ++i){
x=re(),y=re(),op=re();
s[op]++;
b[op][s[op]][0]=x;
b[op][s[op]][1]=y;
ds[op][x]++; ds[op][y]++;
yb[++ytt].to=y; yb[ytt].ne=yhe[x]; yhe[x]=ytt; yb[ytt].co=op;
yb[++ytt].to=x; yb[ytt].ne=yhe[y]; yhe[y]=ytt; yb[ytt].co=op;
} h=1;
for(int i=1; i<=n; ++i)
if(ds[0][i]==0||ds[1][i]==0)dl[++t]=i,vi[i]=1;
while(h<=t){
x=dl[h++];
for(int i=yhe[x]; i; i=yb[i].ne){
int v=yb[i].to,co=yb[i].co; ds[co][v]--;
if(ds[co][v]==0&&!vi[v]){dl[++t]=v; vi[v]=1;}
}
}
for(int i=1; i<=n; ++i) if(!vi[i])bh[i]=++nn; //cout<<nn<<endl;
for(int i=1; i<=s[0]; ++i){
if(bh[b[0][i][0]]&&bh[b[0][i][1]])
ad(bh[b[0][i][0]],bh[b[0][i][1]]);
}
for(int i=1; i<=s[1]; ++i){
if(bh[b[1][i][0]]&&bh[b[1][i][1]])
bt[bh[b[1][i][0]]][bh[b[1][i][1]]]=bt[bh[b[1][i][1]]][bh[b[1][i][0]]]=1;
}
for(int i=1; i<=nn; ++i){
if(!V[i]){
op=cd=0; dfs(i,-1,i);// cout<<cd<<' ';
if(cd==1)continue;
if(cd==2){pd2(li[1],li[2]); continue;}
else for(int j=1; j<=cd; ++j){
if(j<cd){
pd2(li[j],li[j+1]);
} else{
if(op)pd2(li[j],li[1]);
}
}
if(cd==3){pd3(li[1],li[2],li[3]); continue;}
else{
for(int j=1; j<=cd; ++j){
if(j<cd-1)pd3(li[j],li[j+1],li[j+2]);
else if(op)pd3(li[j],li[j%cd+1],li[(j+1)%cd+1]);
}
}
if(cd==4){pd4(li[1],li[2],li[3],li[4]); continue;}
else{
for(int j=1; j<=cd; ++j){
if(j<cd-2)pd4(li[j],li[j+1],li[j+2],li[j+3]);
else if(op)pd4(li[j],li[j%cd+1],li[(j+1)%cd+1],li[(j+2)%cd+1]);
}
}
}
} ks(ans);
}
Details
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Test #1:
score: 100
Accepted
time: 3ms
memory: 17104kb
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: 0ms
memory: 19280kb
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
Wrong Answer
time: 2ms
memory: 14980kb
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
output:
29
result:
wrong answer 1st numbers differ - expected: '27', found: '29'