Submission #631681

#TimeUsernameProblemLanguageResultExecution timeMemory
631681alvingogoMisspelling (JOI22_misspelling)C++14
100 / 100
1168 ms282304 KiB
#include <bits/stdc++.h> #pragma GCC optimize("Ofast") #define AquA cin.tie(0);ios_base::sync_with_stdio(0); #define fs first #define sc second #define p_q priority_queue using namespace std; const int mod=1e9+7; void add(int& x,int y){ x+=y; x-=mod*(x>=mod); x+=mod*(x<0); } int main(){ AquA; int n; cin >> n; int m; cin >> m; vector<vector<int> > dc(n),ic(n),ddc(n+1),dic(n+1); vector<int> kd(n,-1),ki(n,-1); for(int i=0;i<m;i++){ int a,b; cin >> a >> b; a--; b--; if(a<b){ dc[a+1].push_back(a); ddc[b+1].push_back(a); } else{ ic[b+1].push_back(b); dic[a+1].push_back(b); } } multiset<int> s1,s2; for(int i=0;i<n;i++){ for(auto h:ddc[i]){ s1.erase(s1.find(h)); } for(auto h:dic[i]){ s2.erase(s2.find(h)); } for(auto h:dc[i]){ s1.insert(h); } for(auto h:ic[i]){ s2.insert(h); } if(s1.size()){ kd[i]=*s1.rbegin(); } if(s2.size()){ ki[i]=*s2.rbegin(); } } vector<vector<int> > dp(n,vector<int>(26)); vector<vector<int> > pre=dp,pp=dp; for(int i=0;i<26;i++){ dp[0][i]=1; pre[0][i]=pre[0][(i>0)*(i-1)]+1; pp[0][i]=pre[0][i]; } for(int i=1;i<n;i++){ for(int j=0;j<26;j++){ if(j){ int z=-1; if(kd[i]>=0){ z=kd[i]; } add(dp[i][j],pp[i-1][j-1]); if(z>=0){ add(dp[i][j],-pp[z][j-1]); } } int z=-1; if(ki[i]>=0){ z=ki[i]; } add(dp[i][j],pp[i-1][25]); add(dp[i][j],-pp[i-1][j]); if(z>=0){ add(dp[i][j],pp[z][j]); add(dp[i][j],-pp[z][25]); } add(pre[i][j],dp[i][j]); if(j){ add(pre[i][j],pre[i][j-1]); } add(pp[i][j],pp[i-1][j]); add(pp[i][j],pre[i][j]); } } cout << pp[n-1][25] << "\n"; return 0; }
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