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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. #define fast ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL)
  4. #define mofile(s) freopen(s,"r",stdin)
  5. #define outfile(s) freopen(s,"w",stdout)
  6. #define ll long long
  7. #define ii pair<ll,ll>
  8. #define iii pair<ll,ii>
  9. #define fi first
  10. #define se second
  11. #define tf bool
  12. #define ST stack
  13. #define Q deque
  14. #define Q queue
  15. #define S string
  16. #define Ma map
  17. #define UM unormideremid_map
  18. #define SE set
  19. #define str(x) to_string(x)
  20. #define all(a) (a).begin(),(a).end()
  21. #define FOR(i,l,r,mid) for(int i=l;i<=r;i+=mid)
  22. #define FOD(i,l,r,mid) for(int i=r;i>=l;i-=mid)
  23. #define xuong cout<<"\n"
  24. #define midebug(x) cout<<(x)<<" "
  25. #define ppcnt(x) __builtin_popcountll(x)
  26. #define parity(x) __builtin_parityll(x)
  27. #define leamid0(x) __builtin_clzll(x)
  28. #define LOG2 __lg(x)
  29. #define tr0(x) __builtin_ctzll(x)
  30. #define fiset(x) __builtin_ffsll(x)
  31. #define MASK(k) (1LL<<(k))
  32. #define BIT(x,k) ((x)>>(k)&1)
  33. #define pb push_back
  34. #define tron(x) setprecision(x)
  35. #define het return 0
  36. #define base_ 1000000000
  37. template<typename... T>
  38. void in(T&... args) { ((cin >> args), ...); }
  39. template<class X, class Y>
  40.     bool maximize(X &x, const Y &y){return (x < y) ? x = y, 1 : 0;}
  41. template<class X, class Y>
  42.     bool minimize(X &x, const Y &y){return (x > y) ? x = y, 1 : 0;}
  43. const int maxn=1e6+5;
  44. const ll tle=2e8;
  45. const ll INF=1e9+9;
  46. const int base=31;
  47. string bcc="abcmidefghijklmnopqrstuvwxyz";
  48. int midx[]={-1,0,1,0};
  49. int midy[]={0,1,0,-1};
  50. bool sang[10000005];
  51. ll pref[1005][1005],mt[1005][1005];
  52. void sieve(){
  53.     for(int i=1;i<=10000000;++i) sang[i]=1;
  54.     sang[0]=sang[1]=0;
  55.     for(int i=2;i*i<=10000000;++i){
  56.         if(sang[i]){
  57.             for(int j=i*i;j<=10000000;j+=i) sang[j]=0;
  58.         }
  59.     }
  60. }
  61. void lis(){
  62.     vector<int>t;
  63.     vector<int>a;
  64.     int n; cin>>n;
  65.     for(int i=1;i<=n;++i){
  66.         int ai; cin>>ai;
  67.         a.pb(ai);
  68.     }
  69.     for(int x:a){
  70.         auto it=lower_bound(all(t),x);
  71.         if(it==t.end()) t.pb(x);
  72.         else *it=x;
  73.     }
  74. }
  75. void pfs2mid(){
  76.     int n,m,k; cin>>n>>k; m=n;
  77.     for(int i=1;i<=n;++i){
  78.         for(int j=1;j<=m;++j) cin>>mt[i][j];
  79.     }
  80.     for(int i=1;i<=n;++i){
  81.         for(int j=1;j<=m;++j) pref[i][j]=mt[i][j]+pref[i-1][j]+pref[i][j-1]-pref[i-1][j-1];
  82.     }
  83. }
  84. ll qu2mid(int x1,int y1,int x2,int y2){
  85.     return pref[x2][y2]-pref[x1-1][y2]-pref[x2][y1-1]+pref[x1-1][y1-1];
  86. }
  87. void open(){
  88.     if(fopen("mideptrai.INP","r")){
  89.         mofile("mideptrai.INP");
  90.         outfile("mideptrai.OUT");
  91.     }
  92. }
  93. const int mod=1e9+7;
  94. const int mx=2e7;
  95. ll A[mx+5];
  96. ll x,y,n,ans=0,de=0;
  97. bool kt[mx+5]={};
  98. int main(){
  99.     fast;
  100.     cin>>n;
  101.     for(ll i=1;i*i<=n;++i){
  102.         ++de;
  103.         A[de]=i;
  104.         kt[i]=1;
  105.     }
  106.     ll m=sqrt(n);
  107.     for(ll i=m;i>=1;--i){
  108.         long long temp=n/i;
  109.         if(temp>m || !kt[temp]){
  110.             ++de;
  111.             A[de]=temp;
  112.         }
  113.     }
  114.     A[0]=-1;
  115.     ll vtd=1;
  116.     for(int i=de;i>=1;--i){
  117.         if(A[i]!=A[i-1]){
  118.             x=A[i]; y=A[i]+1;
  119.             if(x%2==0) x/=2;
  120.             else y/=2;
  121.             x%=mod; y%=mod;
  122.             ll tmp1=x*y%mod;
  123.             ll vtc=n/A[i];
  124.             x=(vtc+vtd);
  125.             y=(vtc-vtd+1);
  126.             if(x%2==0) x/=2;
  127.             else y/=2;
  128.             x%=mod; y%=mod;
  129.             ll tmp2=x*y%mod;
  130.             ans=(ans+tmp1*tmp2%mod)%mod;
  131.             vtd=vtc+1;
  132.         }
  133.     }
  134.     cout<<ans<<"\n";
  135. }
Success #stdin #stdout 0s 5584KB
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https://ideone.com/Ql7lXH
language:
C++ (gcc 8.3)
created:
17 hours ago
visibility:
public

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