Submission #901667

#TimeUsernameProblemLanguageResultExecution timeMemory
901667alexander707070Misspelling (JOI22_misspelling)C++14
28 / 100
62 ms11112 KiB
#include<bits/stdc++.h> #define MAXN 2007 using namespace std; const int mod=1e9+7; int n,m,a,b,ans; int dp[MAXN][30]; int maxs[MAXN][MAXN],maxs2[MAXN][MAXN],es[MAXN],es2[MAXN]; bool bad[MAXN],bad2[MAXN]; void calc_dp(){ for(int pos=n;pos>=1;pos--){ for(int f=pos+1;f<=es[pos];f++)bad[f]=true; for(int f=pos+1;f<=es2[pos];f++)bad2[f]=true; for(int letter=0;letter<26;letter++){ dp[pos][letter]=1; for(int nxtletter=0;nxtletter<26;nxtletter++){ if(nxtletter==letter)continue; for(int f=pos+1;f<=n;f++){ if(nxtletter<letter and !bad[f]){ dp[pos][letter]+=dp[f][nxtletter]; dp[pos][letter]%=mod; } if(nxtletter>letter and !bad2[f]){ dp[pos][letter]+=dp[f][nxtletter]; dp[pos][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); } } calc_dp(); for(int i=0;i<26;i++){ ans+=dp[1][i]; ans%=mod; } cout<<ans<<"\n"; return 0; }
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