QOJ.ac
QOJ
ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#656091 | #9488. Do Not Turn Back | ucup-team4938# | TL | 573ms | 8972kb | C++14 | 2.7kb | 2024-10-19 11:18:08 | 2024-10-19 11:18:09 |
Judging History
answer
#include<bits/stdc++.h>
#define int long long
#define mod 998244353ll
#define pii pair<int,int>
#define fi first
#define se second
#define mems(x,y) memset(x,y,sizeof(x))
#define pb push_back
#define db double
using namespace std;
const int maxn=110;
const int inf=1e18;
inline int read(){
int x=0,f=1;
char ch=getchar();
while(ch<'0'||ch>'9'){if(ch=='-')f=-1;ch=getchar();}
while(ch>='0'&&ch<='9'){x=(x<<3)+(x<<1)+(ch-48);ch=getchar();}
return x*f;
}
bool Mbe;
int n,m,k;
int head[maxn],tot;
struct nd{
int nxt,to;
}e[maxn*maxn<<1];
void add(int u,int v){e[++tot]={head[u],v};head[u]=tot;}
int d[maxn];
int dp[maxn][maxn];
struct mat{
int e[maxn*3][maxn*3];
mat(){mems(e,0);}
mat operator*(const mat&tmp)const{
mat res;
for(int i=0;i<=m;i++){
for(int j=0;j<=m;j++){
for(int k=0;k<=m;k++)(res.e[i][j]+=e[i][k]*tmp.e[k][j])%=mod;
}
}
return res;
}
}a,b;
mat one(){
mat res;
for(int i=0;i<=m;i++)res.e[i][i]=1;
return res;
}
mat ksm(mat a,int b){
mat ans=one();
while(b){
if(b&1)ans=ans*a;
a=a*a;
b>>=1;
}
return ans;
}
int id(int u,int v){return u*n+v;}
void work(){
n=read();m=read();k=read();
for(int i=1;i<=m;i++){
int u=read(),v=read();
add(u,v),add(v,u),d[u]++,d[v]++;
}
// for(int i=1;i<=n;i++)cout<<d[i]<<" ";cout<<"\n";
dp[0][1]=1;
for(int i=1;i<=5;i++){
for(int u=1;u<=n;u++){
for(int ii=head[u];ii;ii=e[ii].nxt){
int v=e[ii].to;
(dp[i][v]+=dp[i-1][u])%=mod;
}
if(i>=2)(dp[i][u]+=dp[i-2][u]*(mod-(d[u]-(i!=2)))%mod)%=mod;
}
// cout<<i<<"\n";
// for(int u=1;u<=n;u++)cout<<dp[i][u]<<" ";cout<<"\n";
}
if(k<=3){
printf("%lld\n",dp[k][n]);
return ;
}
for(int i=1;i<=3;i++){
for(int u=1;u<=n;u++)a.e[1][id(i-1,u)]=dp[i][u];
}
for(int i=0;i<2;i++){
for(int u=1;u<=n;u++)b.e[id(i+1,u)][id(i,u)]=1;
}
m=3*n;
for(int u=1;u<=n;u++){
for(int i=head[u];i;i=e[i].nxt){
int v=e[i].to;
b.e[id(2,v)][id(2,u)]++;
}
b.e[id(1,u)][id(2,u)]=mod-(d[u]-1);
}
// for(int i=1;i<=m;i++){
// for(int j=1;j<=m;j++)cout<<b.e[i][j]<<" ";cout<<"\n";
// }
// puts("");
b=ksm(b,k-1);
// for(int i=1;i<=m;i++){
// for(int j=1;j<=m;j++)cout<<b.e[i][j]<<" ";cout<<"\n";
// }
a=a*b;
// for(int i=1;i<=n;i++)cout<<a.e[1][i]<<" ";puts("");
// for(int i=1;i<=n;i++)cout<<a.e[1][i+n]<<" ";puts("");
// for(int i=1;i<=n;i++)cout<<a.e[1][i+2*n]<<" ";puts("");
printf("%lld\n",a.e[1][n]);
}
// \
444
bool Med;
int T;
signed main(){
// freopen(".in","r",stdin);
// freopen(".out","w",stdout);
// ios::sync_with_stdio(0);
// cin.tie(0);cout.tie(0);
// cerr<<(&Mbe-&Med)/1048576.0<<" MB\n";
T=1;
while(T--)work();
}
Details
Tip: Click on the bar to expand more detailed information
Test #1:
score: 100
Accepted
time: 3ms
memory: 8900kb
input:
6 8 5 1 2 1 3 2 3 2 4 3 5 4 5 4 6 5 6
output:
2
result:
ok "2"
Test #2:
score: 0
Accepted
time: 3ms
memory: 8964kb
input:
11 11 2023 1 2 2 3 3 4 4 5 5 6 6 7 7 8 8 9 9 10 10 11 1 11
output:
1
result:
ok "1"
Test #3:
score: 0
Accepted
time: 7ms
memory: 8904kb
input:
7 21 1000000000 1 2 1 3 1 4 1 5 1 6 1 7 2 3 2 4 2 5 2 6 2 7 3 4 3 5 3 6 3 7 4 5 4 6 4 7 5 6 5 7 6 7
output:
405422475
result:
ok "405422475"
Test #4:
score: 0
Accepted
time: 7ms
memory: 8948kb
input:
12 56 78144853 1 2 1 3 1 4 1 6 1 7 1 9 1 10 1 11 1 12 2 4 2 5 2 6 2 8 2 9 2 10 2 11 2 12 3 4 3 5 3 6 3 7 3 8 3 9 3 11 3 12 4 5 4 6 4 7 4 8 4 9 4 10 4 11 4 12 5 6 5 7 5 8 5 9 5 10 5 11 5 12 6 8 6 9 6 10 7 8 7 9 7 11 7 12 8 9 8 10 8 11 8 12 9 10 9 11 9 12 10 11 11 12
output:
843326021
result:
ok "843326021"
Test #5:
score: 0
Accepted
time: 16ms
memory: 8952kb
input:
13 61 268435455 1 2 1 3 1 4 1 5 1 6 1 8 1 9 1 10 1 11 1 12 1 13 2 3 2 4 2 5 2 6 2 7 2 8 2 9 2 12 2 13 3 4 3 5 3 6 3 7 3 8 3 9 3 10 4 6 4 7 4 9 4 12 4 13 5 6 5 7 5 9 5 11 5 13 6 7 6 8 6 9 6 11 6 12 6 13 7 8 7 10 7 11 7 12 8 9 8 10 8 11 8 12 8 13 9 10 9 12 9 13 10 11 10 12 10 13 11 12 11 13 12 13
output:
69651169
result:
ok "69651169"
Test #6:
score: 0
Accepted
time: 16ms
memory: 8948kb
input:
14 79 33554431 1 2 1 3 1 4 1 5 1 6 1 7 1 8 1 9 1 10 1 11 1 12 1 13 1 14 2 3 2 4 2 5 2 6 2 7 2 8 2 11 2 12 2 14 3 5 3 6 3 7 3 8 3 9 3 10 3 11 3 12 3 13 3 14 4 5 4 6 4 7 4 8 4 9 4 11 4 12 5 6 5 7 5 10 5 11 5 12 5 13 5 14 6 7 6 8 6 9 6 10 6 11 6 12 6 13 6 14 7 8 7 9 7 10 7 11 7 12 7 13 7 14 8 10 8 11 8...
output:
793621538
result:
ok "793621538"
Test #7:
score: 0
Accepted
time: 17ms
memory: 8972kb
input:
15 92 439487671 1 2 1 3 1 5 1 7 1 8 1 9 1 10 1 11 1 13 1 14 1 15 2 3 2 4 2 5 2 6 2 7 2 8 2 9 2 10 2 11 2 12 2 13 2 14 2 15 3 4 3 5 3 6 3 7 3 8 3 9 3 10 3 11 3 12 3 13 3 14 3 15 4 5 4 6 4 7 4 8 4 9 4 10 4 11 4 12 4 13 4 14 4 15 5 7 5 8 5 10 5 11 5 12 5 13 5 14 6 7 6 8 6 9 6 10 6 11 6 12 6 13 6 14 6 1...
output:
196201187
result:
ok "196201187"
Test #8:
score: 0
Accepted
time: 5ms
memory: 8936kb
input:
5 10 230391930 1 2 1 3 1 4 1 5 2 3 2 4 2 5 3 4 3 5 4 5
output:
552614127
result:
ok "552614127"
Test #9:
score: 0
Accepted
time: 6ms
memory: 8972kb
input:
5 8 268435455 1 2 1 3 1 4 2 3 2 4 2 5 3 4 4 5
output:
666456772
result:
ok "666456772"
Test #10:
score: 0
Accepted
time: 3ms
memory: 8892kb
input:
6 13 67108863 1 2 1 3 1 4 1 5 2 4 2 5 2 6 3 4 3 5 3 6 4 5 4 6 5 6
output:
317571510
result:
ok "317571510"
Test #11:
score: 0
Accepted
time: 3ms
memory: 8932kb
input:
7 18 67108863 1 2 1 3 1 4 1 5 1 6 1 7 2 3 2 4 2 5 2 6 2 7 3 5 3 6 4 5 4 6 4 7 5 6 6 7
output:
921436359
result:
ok "921436359"
Test #12:
score: 0
Accepted
time: 9ms
memory: 8956kb
input:
11 43 115349891 1 2 1 3 1 4 1 5 1 6 1 7 1 8 1 9 1 10 2 3 2 6 2 7 2 8 2 9 2 11 3 4 3 5 3 8 3 9 3 10 4 5 4 6 4 7 4 8 4 9 4 11 5 6 5 7 5 9 5 10 5 11 6 7 6 9 6 10 6 11 7 8 7 9 7 10 7 11 8 9 8 11 9 10 9 11
output:
853336717
result:
ok "853336717"
Test #13:
score: 0
Accepted
time: 15ms
memory: 8888kb
input:
14 78 758166229 1 2 1 3 1 4 1 5 1 6 1 7 1 8 1 9 1 10 1 11 1 12 1 13 1 14 2 3 2 4 2 5 2 6 2 7 2 8 2 10 2 11 2 14 3 5 3 6 3 7 3 8 3 9 3 10 3 11 4 5 4 6 4 7 4 8 4 9 4 10 4 11 4 13 4 14 5 6 5 7 5 8 5 9 5 10 5 11 5 13 5 14 6 7 6 8 6 9 6 10 6 11 6 12 6 14 7 8 7 9 7 10 7 11 7 12 7 13 7 14 8 9 8 10 8 11 8 1...
output:
949739691
result:
ok "949739691"
Test #14:
score: 0
Accepted
time: 573ms
memory: 8932kb
input:
52 51 376665160 1 2 1 3 2 4 4 5 5 6 5 7 3 8 5 9 5 10 5 11 6 12 4 13 2 14 6 15 14 16 9 17 8 18 15 19 11 20 9 21 1 22 21 23 3 24 24 25 24 26 10 27 7 28 24 29 16 30 6 31 4 32 5 33 10 34 33 35 32 36 19 37 29 38 18 39 17 40 13 41 39 42 3 43 12 44 34 45 20 46 38 47 27 48 43 49 5 50 6 51 4 52
output:
0
result:
ok "0"
Test #15:
score: 0
Accepted
time: 10ms
memory: 8932kb
input:
29 28 4 1 2 1 3 2 4 1 5 3 6 3 7 6 8 4 9 3 10 6 11 10 12 4 13 3 14 9 15 6 16 14 17 16 18 11 19 19 20 8 21 6 22 18 23 18 24 3 25 2 26 8 27 1 28 8 29
output:
1
result:
ok "1"
Test #16:
score: -100
Time Limit Exceeded
input:
99 98 33554431 46 94 29 46 29 75 50 75 50 61 6 61 6 10 10 49 38 49 38 86 37 86 37 66 31 66 31 71 41 71 41 67 22 67 22 52 52 62 62 74 74 89 53 89 53 91 69 91 40 69 40 97 45 97 9 45 9 18 18 23 23 25 25 43 43 92 3 92 3 5 5 28 28 58 19 58 17 19 17 80 4 80 4 56 24 56 21 24 1 21 1 95 51 95 36 51 36 96 20 ...