Submission #546643

#TimeUsernameProblemLanguageResultExecution timeMemory
546643inksamuraiMisspelling (JOI22_misspelling)C++17
100 / 100
1809 ms415852 KiB
#include <bits/stdc++.h> using namespace std; #define rep(i,n) for(int i=0;i<n;i++) #define rng(i,x,n) for(int i=x;i<n;i++) #define per(i,n) for(int i=n-1;i>=0;i--) #define fi first #define se second #define pb push_back #define sz(a) (int)a.size() #define vec(...) vector<__VA_ARGS__> #define _3x2WzQf ios::sync_with_stdio(0),cin.tie(0) typedef long long ll; using pii=pair<int,int>; using vi=vector<int>; void print(){cout<<'\n';} template<class h,class...t> void print(const h&v,const t&...u){cout<<v<<' ',print(u...);} // e //snuke's mod int template <ll mod> struct modint{ ll x; // typedef long long ll; modint(ll x=0):x((x%mod+mod)%mod){} modint operator-()const{return modint(-x);} modint& operator+=(const modint a){if((x+=a.x)>=mod) x-=mod; return *this;} modint& operator-=(const modint a){if((x+=mod-a.x)>=mod) x-=mod; return *this;} modint& operator*=(const modint a){(x*=a.x)%=mod; return *this;} modint operator+(const modint a)const{modint res(*this); return res+=a;} modint operator-(const modint a)const{modint res(*this); return res-=a;} modint operator*(const modint a)const{modint res(*this); return res*=a;} modint pow(ll n)const{ modint res=1,x(*this); while(n){ if(n&1)res*=x; x*=x; n>>=1; } return res; } modint inv()const{return pow(mod-2);} }; using mint=modint<1000'000'007>; mint dp[30][2]; signed main(){ _3x2WzQf; int n,m; cin>>n>>m; vec(vi) qry(n,vi(2,-1)); rep(i,m){ int l,r; cin>>l>>r; l-=1,r-=1; bool type=0; if(l>r){ swap(l,r); type=1; } qry[l][type]=max(qry[l][type],r); } using tup=tuple<int,int,ll>; deque<tup> dq0,dq1; per(ch,26){ dp[ch][0]=1; } per(i,n-1){ int r0=qry[i][0]; int r1=qry[i][1]; vec(vec(mint)) fdp(26,vec(mint)(2)); rep(x,26){ rep(y,26){ if(x==y) continue; if(r0!=-1 and y>x) continue; if(r1!=-1 and y<x) continue; rep(t,2){ int nt=(y>x?1:0); fdp[y][nt]+=dp[x][t]; } } } rep(y,26){ rep(nt,2){ if(nt) dq1.pb({i,y,fdp[y][nt].x}); else dq0.pb({i,y,fdp[y][nt].x}); dp[y][nt]+=fdp[y][nt]; } } while(sz(dq1)){ auto &[j,ch,val]=dq1.back(); if(j<r0){ dp[ch][1]-=mint(val); dq1.pop_back(); }else{ break; } } while(sz(dq0)){ auto &[j,ch,val]=dq0.back(); if(j<r1){ dp[ch][0]-=mint(val); dq0.pop_back(); }else{ break; } } } mint ans=0; rep(x,26){ rep(t,2){ ans+=dp[x][t]; } } print(ans.x); // return 0; }
#Verdict Execution timeMemoryGrader output
Fetching results...
#Verdict Execution timeMemoryGrader output
Fetching results...
#Verdict Execution timeMemoryGrader output
Fetching results...
#Verdict Execution timeMemoryGrader output
Fetching results...
#Verdict Execution timeMemoryGrader output
Fetching results...