제출 #992563

#제출 시각아이디문제언어결과실행 시간메모리
992563snpmrnhlolMisspelling (JOI22_misspelling)C++17
100 / 100
256 ms160852 KiB
#include<bits/stdc++.h> using namespace std; const int N = 5e5; const int F = 26; const int mod = 1e9 + 7; const int inf = 2e9; int ans = 0; int v[N][2]; int v2[N][F][2]; int v3[N][2]; int s[F][2]; int cnt[2]; int dp[N][F]; int main(){ ios_base::sync_with_stdio(0); cin.tie(0); int n,m; cin>>n>>m; for(int i = 0;i < n;i++){ v[i][0] = -1; v[i][1] = -1; } for(int i = 0;i < m;i++){ int a,b; cin>>a>>b; a--;b--; if(a == b)continue; if(a < b){ v[a][0] = max(v[a][0],b); }else{ v[b][1] = max(v[b][1],a); } } for(int j = 0;j < F;j++){ dp[n - 1][j] = 1; } for(int i = n - 2;i >= 0;i--){ for(int k = 0;k < 2;k++){ if(k == 0){ for(int j = 1;j < F;j++){ v2[cnt[k]][j][k] = (s[j - 1][0] + s[j - 1][1] + 1)%mod; if(v2[cnt[k]][j][k] >= mod)v2[cnt[k]][j][k]-=mod; } }else{ for(int j = 0;j < F - 1;j++){ v2[cnt[k]][j][k] = (s[j + 1][0] + s[j + 1][1] + 1); if(v2[cnt[k]][j][k] >= mod)v2[cnt[k]][j][k]-=mod; } } v3[cnt[k]][k] = i; cnt[k]++; if(k == 0){ for(int j = 1;j < F;j++){ v2[cnt[0] - 1][j][0]+=v2[cnt[0] - 1][j - 1][0]; if(v2[cnt[0] - 1][j][0] >= mod)v2[cnt[0] - 1][j][0]-=mod; } }else{ for(int j = F - 2;j >= 0;j--){ v2[cnt[1] - 1][j][1]+=v2[cnt[1] - 1][j + 1][1]; if(v2[cnt[1] - 1][j][1] >= mod)v2[cnt[1] - 1][j][1]-=mod; } } } for(int j = 0;j < F;j++){ for(int k = 0;k < 2;k++){ s[j][k]+=v2[cnt[k] - 1][j][k]; s[j][k]%=mod; } } for(int k = 0;k < 2;k++){ if(v[i][k] != -1){ while(cnt[k] > 0 && v3[cnt[k] - 1][k] < v[i][k]){ for(int j = 0;j < F;j++){ s[j][k]-=v2[cnt[k] - 1][j][k]; if(s[j][k] < 0)s[j][k]+=mod; } cnt[k]--; } } } for(int j = 0;j < F;j++){ for(int k = 0;k < 2;k++){ dp[i][j]+=s[j][k]; if(dp[i][j] >= mod)dp[i][j]-=mod; } dp[i][j]++; } } for(int j = 0;j < F;j++){ ans+=dp[0][j]; ans%=mod; } cout<<ans; 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...