제출 #901674

#제출 시각아이디문제언어결과실행 시간메모리
901674alexander707070Misspelling (JOI22_misspelling)C++14
100 / 100
1485 ms116856 KiB
#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; }
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