Submission #551592

#TimeUsernameProblemLanguageResultExecution timeMemory
551592kshitij_sodaniMisspelling (JOI22_misspelling)C++14
100 / 100
1093 ms266512 KiB
#include <bits/stdc++.h> using namespace std; typedef long long llo; #define a first #define b second #define pb push_back #define endl '\n' const llo mod=1e9+7; llo n,m; vector<llo> pre3[500001]; llo dp[500001][26]; vector<pair<llo,llo>> pre2[500001]; llo pre[500001][26]; int main(){ ios_base::sync_with_stdio(false); cin.tie(NULL); cin>>n>>m; for(llo i=0;i<m;i++){ llo aa,bb; cin>>aa>>bb; aa--; bb--; llo cc=0; if(aa>bb){ swap(aa,bb); cc=1; } //c=0 next is smaller pre3[aa].pb(cc); pre2[bb].pb({aa,cc}); } multiset<llo> cur; multiset<llo> cur2; for(llo i=0;i<n;i++){ if(i==0){ for(llo j=0;j<26;j++){ dp[i][j]=1; } } llo ma=0; llo ma2=0; if(cur.size()){ auto j=cur.end(); j--; ma=(*j)+1; } if(cur2.size()){ auto j=cur2.end(); j--; ma2=(*j)+1; } //cout<<i<<":"<<ma<<":"<<ma2<<endl; //max(ma,ma2) to i-1 //min(ma,ma2) to max(ma,ma2)-1 //rest is impossible pair<llo,llo> cur3={max(ma,ma2),i-1}; if(cur3.a<=cur3.b){ llo su=0; for(llo j=0;j<26;j++){ su+=(pre[cur3.b+1][j]-pre[cur3.a][j]); if(su<0){ su+=mod; } if(su>=mod){ su-=mod; } } for(llo j=0;j<26;j++){ dp[i][j]+=su; if(dp[i][j]>=mod){ dp[i][j]-=mod; } llo cot=(pre[cur3.b+1][j]-pre[cur3.a][j]); if(cot<0){ cot+=mod; } dp[i][j]-=cot; if(dp[i][j]<0){ dp[i][j]+=mod; } if(dp[i][j]>=mod){ dp[i][j]-=mod; } } } /* for(llo k=max(ma,ma2);k<=i-1;k++){ llo su=0; for(llo j=0;j<26;j++){ su+=dp[k][j]; if(su>=mod){ su-=mod; } } for(llo j=0;j<26;j++){ dp[i][j]+=(su-dp[k][j]+mod); if(dp[i][j]>=mod){ dp[i][j]-=mod; } if(dp[i][j]>=mod){ dp[i][j]-=mod; } } }*/ cur3={min(ma,ma2),max(ma,ma2)-1}; if(cur3.a<=cur3.b){ if(ma<ma2){ //no restrictions x>y llo su=0; for(llo j=25;j>=0;j--){ dp[i][j]+=su; if(dp[i][j]>=mod){ dp[i][j]-=mod; } //cout<<cur3.a<<",,"<<cur3.b+1<<endl; llo cot=pre[cur3.b+1][j]-pre[cur3.a][j]+mod; if(cot>=mod){ cot-=mod; } su+=cot; if(su>=mod){ su-=mod; } } } else{ //x>y always llo su=0; for(llo j=0;j<26;j++){ dp[i][j]+=su; if(dp[i][j]>=mod){ dp[i][j]-=mod; } llo cot=pre[cur3.b+1][j]-pre[cur3.a][j]; if(cot<0){ cot+=mod; } su+=cot; if(su>=mod){ su-=mod; } } } } /* for(llo k=min(ma,ma2);k<=max(ma,ma2)-1;k++){ if(ma<ma2){ //no restrictions x>y llo su=0; for(llo j=25;j>=0;j--){ dp[i][j]+=su; if(dp[i][j]>=mod){ dp[i][j]-=mod; } su+=dp[k][j]; if(su>=mod){ su-=mod; } } } else{ //x>y always llo su=0; for(llo j=0;j<26;j++){ dp[i][j]+=su; if(dp[i][j]>=mod){ dp[i][j]-=mod; } su+=dp[k][j]; if(su>=mod){ su-=mod; } } } }*/ /* if(ma<ma2){ } else if(ma>ma2){ } */ for(auto j:pre3[i]){ if(j==0){ cur.insert(i); } else{ cur2.insert(i); } } for(auto j:pre2[i]){ if(j.b==1){ auto jj=cur2.find(j.a); cur2.erase(jj); } else{ auto jj=cur.find(j.a); cur.erase(jj); } } for(int j=0;j<26;j++){ pre[i+1][j]=pre[i][j]+dp[i][j]; if(pre[i+1][j]>=mod){ pre[i+1][j]-=mod; } } } llo ans=0; for(llo i=0;i<n;i++){ for(llo j=0;j<26;j++){ //cout<<i<<":"<<j<<":"<<dp[i][j]<<endl; ans=(ans+dp[i][j]); if(ans>=mod){ ans-=mod; } } } cout<<ans<<endl; return 0; }
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