이 제출은 이전 버전의 oj.uz에서 채점하였습니다. 현재는 제출 당시와는 다른 서버에서 채점을 하기 때문에, 다시 제출하면 결과가 달라질 수도 있습니다.
#include<bits/stdc++.h>
#define MAXN 500007
using namespace std;
const int mod=1e9+7;
int n,m,a,b,ans;
int dp[MAXN][30];
int es[MAXN],es2[MAXN];
bool bad[MAXN],bad2[MAXN];
int pt,pt2;
int sum[30],sum2[30];
set<int> s,t;
void calc_dp(){
pt=pt2=n+1;
for(int pos=n;pos>=1;pos--){
auto it=s.lower_bound(pos+1);
while(it!=s.end() and *it<=es[pos]){
for(int letter=0;letter<26;letter++){
sum[letter]-=dp[*it][letter]; sum[letter]+=mod; sum[letter]%=mod;
}
it++;
}
while(true){
auto it=s.lower_bound(pos+1);
if(it!=s.end() and *it<=es[pos])s.erase(it);
else break;
}
it=t.lower_bound(pos+1);
while(it!=t.end() and *it<=es2[pos]){
for(int letter=0;letter<26;letter++){
sum2[letter]-=dp[*it][letter]; sum2[letter]+=mod; sum2[letter]%=mod;
}
it++;
}
while(true){
auto it=t.lower_bound(pos+1);
if(it!=t.end() and *it<=es2[pos])t.erase(it);
else break;
}
if(es[pos]>=pos+1)pt=pos+1;
if(es2[pos]>=pos+1)pt2=pos+1;
for(int letter=0;letter<26;letter++){
dp[pos][letter]=1;
for(int nxtletter=0;nxtletter<26;nxtletter++){
if(nxtletter==letter)continue;
if(nxtletter<letter)dp[pos][letter]+=sum[nxtletter];
if(nxtletter>letter)dp[pos][letter]+=sum2[nxtletter];
dp[pos][letter]%=mod;
}
}
for(int letter=0;letter<26;letter++){
sum[letter]+=dp[pos][letter]; sum[letter]%=mod;
sum2[letter]+=dp[pos][letter]; sum2[letter]%=mod;
}
}
}
int main(){
ios_base::sync_with_stdio(0);
cin.tie(0);
cout.tie(0);
cin>>n>>m;
for(int i=1;i<=m;i++){
cin>>a>>b;
if(a<b){
es[a]=max(es[a],b);
}else{
es2[b]=max(es2[b],a);
}
}
for(int i=1;i<=n;i++){
s.insert(i);
t.insert(i);
}
calc_dp();
for(int i=0;i<26;i++){
ans+=dp[1][i];
ans%=mod;
}
cout<<ans<<"\n";
return 0;
}
# | Verdict | Execution time | Memory | Grader output |
---|
Fetching results... |
# | Verdict | Execution time | Memory | Grader output |
---|
Fetching results... |
# | Verdict | Execution time | Memory | Grader output |
---|
Fetching results... |
# | Verdict | Execution time | Memory | Grader output |
---|
Fetching results... |
# | Verdict | Execution time | Memory | Grader output |
---|
Fetching results... |