Submission #959177

#TimeUsernameProblemLanguageResultExecution timeMemory
959177huutuanMisspelling (JOI22_misspelling)C++14
100 / 100
492 ms183316 KiB
#include<bits/stdc++.h> using namespace std; // #define int long long #define all(x) x.begin(), x.end() #define rall(x) x.rbegin(), x.rend() #define isz(x) ((int)x.size()) #define sumof(x) accumulate(all(x), 0ll) const int N=5e5+10, mod=1e9+7; int n, m; int f[N][26], ff[N][26]; vector<pair<int, int>> g[N]; int pf[2][26]; int add(int x, int y){ return x+y>=mod?x+y-mod:x+y; } int sub(int x, int y){ return x<y?x-y+mod:x-y; } void solve(){ cin >> n >> m; for (int i=1; i<=m; ++i){ int u, v; cin >> u >> v; if (u<v){ g[u].emplace_back(v, 0); }else{ g[v].emplace_back(u, 1); } } vector<set<int>> pos(2); for (int i=1; i<=n; ++i) pos[0].insert(i); pos[1]=pos[0]; for (int i=0; i<26; ++i) f[n][i]=1, ff[n][i]=i+1; for (int i=0; i<26; ++i) pf[0][i]=pf[1][i]=i+1; for (int i=n-1; i>=1; --i){ for (auto &j:g[i]){ int l=i+1, r=j.first, k=j.second; for (auto it=pos[k^1].lower_bound(l); it!=pos[k^1].end() && (*it)<=r; it=pos[k^1].erase(it)){ for (int t=0; t<26; ++t) pf[k^1][t]=sub(pf[k^1][t], ff[*it][t]); } } for (int j=0; j<26; ++j){ f[i][j]=1; if (j) f[i][j]=add(f[i][j], pf[0][j-1]); f[i][j]=add(f[i][j], sub(pf[1][25], pf[1][j])); } for (int j=0; j<26; ++j){ ff[i][j]=f[i][j]; if (j) ff[i][j]=add(ff[i][j], ff[i][j-1]); pf[0][j]=add(pf[0][j], ff[i][j]); pf[1][j]=add(pf[1][j], ff[i][j]); } } int ans=0; for (int j=0; j<26; ++j) ans=add(ans, f[1][j]); cout << ans; } int32_t main(){ ios_base::sync_with_stdio(false); cin.tie(nullptr); int ntests=1; // cin >> ntests; for (int i=1; i<=ntests; ++i) solve(); return 0; }
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