QOJ.ac
QOJ
ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#304015 | #1191. Reordering the Documents | NYCU_CartesianTree# | WA | 1ms | 4120kb | C++20 | 1.8kb | 2024-01-13 11:30:02 | 2024-01-13 11:30:03 |
Judging History
answer
#include<bits/stdc++.h>
using namespace std;
#define int long long
#define F first
#define S second
#define pb push_back
const int mol=1e9+7;
vector<int>node[5005];
bool vis[5005];
int dis[5005];
bool ok=1;
int t1=0,t2=0;
void dfs(int v){
vis[v]=1;
if(dis[v]==1) t2++;
else t1++;
for(int k:node[v]){
if(!vis[k]) dis[k]=(dis[v]^1),dfs(k);
else{
if(dis[k]!=(dis[v]^1)){
ok=0;
return;
}
}
}
}
int dp[2][5005];
void solve(){
int n,m;
cin>>n>>m;
vector<int>a(n+1);
for(int i=1;i<=n;i++) cin>>a[i];
for(int i=1;i<=n;i++){
for(int j=i+1;j<=n;j++){
if(a[i]>a[j]){
node[i].pb(j);
node[j].pb(i);
}
}
}
dp[0][0]=1;
int iu=1;
for(int i=1;i<=n;i++){
if(!vis[i]){
t1=0,t2=0;
dis[i]=1;
dfs(i);
}
else continue;
if(!ok){
cout<<"0\n";
return;
}
if(t1==0){
for(int j=m;j>=1;j--) dp[iu^1][j]=dp[iu^1][j-1];
continue;
}
for(int j=m;j>=0;j--) dp[iu][j]=0;
for(int j=m;j>=0;j--){
if(j-t1>=0)
dp[iu][j]=dp[iu^1][j-t1];
if(j-t2>=0)
dp[iu][j]+=dp[iu^1][j-t2];
dp[iu][j]%=mol;
}
iu^=1;
// cerr<<t1<<" "<<t2<<"\n";
// cerr<<dp[iu^1][3]<<" "<<dp[iu^1][2]<<" "<<dp[iu^1][4]<<"\n";
}
iu^=1;
int ans=0;
for(int j=m;j>=0;j--){
if(n-j>m) break;
ans+=dp[iu][j];
ans%=mol;
}
// ans<<=1;
// ans%=mol;
cout<<ans<<"\n";
}
signed main(){
ios::sync_with_stdio(0);
cin.tie(0);
solve();
return 0;
}
Details
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Test #1:
score: 100
Accepted
time: 1ms
memory: 3604kb
input:
6 3 1 3 4 2 6 5
output:
4
result:
ok answer is '4'
Test #2:
score: 0
Accepted
time: 0ms
memory: 3724kb
input:
6 6 1 3 4 2 6 5
output:
8
result:
ok answer is '8'
Test #3:
score: 0
Accepted
time: 0ms
memory: 3724kb
input:
4 4 4 3 1 2
output:
0
result:
ok answer is '0'
Test #4:
score: 0
Accepted
time: 0ms
memory: 3736kb
input:
6 3 1 3 4 2 6 5
output:
4
result:
ok answer is '4'
Test #5:
score: 0
Accepted
time: 0ms
memory: 3860kb
input:
6 6 1 3 4 2 6 5
output:
8
result:
ok answer is '8'
Test #6:
score: 0
Accepted
time: 0ms
memory: 3932kb
input:
4 4 4 3 1 2
output:
0
result:
ok answer is '0'
Test #7:
score: -100
Wrong Answer
time: 1ms
memory: 4120kb
input:
1000 500 4 5 6 8 10 11 12 13 14 15 20 23 25 26 28 29 33 35 1 2 36 38 3 7 41 9 16 44 48 17 18 51 52 53 19 21 54 22 24 59 61 62 27 67 30 31 32 34 68 69 37 39 73 40 76 77 42 81 83 43 85 45 87 46 89 94 47 95 49 50 97 101 55 103 105 56 57 58 106 60 108 110 63 111 114 64 115 65 119 66 70 71 120 121 72 124...
output:
1728
result:
wrong answer expected '11363968', found '1728'