QOJ.ac
QOJ
ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#293218 | #3853. Lines in a grid | LaStataleBlue | TL | 530ms | 42684kb | C++23 | 1.5kb | 2023-12-29 00:43:56 | 2023-12-29 00:43:56 |
Judging History
answer
#include<bits/stdc++.h>
using namespace std;
const int MAXN = 1e7+5;
const long long mod = 1e6+3;
int mob[MAXN];
long long sum(long long x,long long n){
long long num = n/x;
return (num*x+x)*num/2ll;
}
long long xplusy(long long n){
long long res=0;
for(long long i=1;i<=n;i++){
res+=2ll*mob[i]*sum(i,n)%mod*(n/i)%mod;
res%=mod;
}
return res;
}
long long xtimesy(long long n){
long long res=0;
for(long long i=1;i<=n;i++){
res+=mob[i]*sum(i,n)%mod*sum(i,n)%mod;
res%=mod;
}
return res;
}
long long coprimepair(long long n){
long long res=0;
for(int i=1;i<=n;i++){
res+=mob[i]*(n/i)*(n/i)%mod;
res%=mod;
}
return res;
}
long long f(long long n){
return (n*xplusy(n/2)%mod)-(3ll*xtimesy(n/2)%mod);
}
long long g(long long n,long long num){
return (n*n%mod*coprimepair(num)%mod)-(n*xplusy(num)%mod)+xtimesy(num);
}
void solve(){
long long n;
cin>>n;
long long ans=0;
if(n>1)ans+=n;
ans+=f(n);
ans+=g(n,n-1);
ans-=g(n,n/2);
ans*=2;
ans%=mod;
ans+=mod;
ans%=mod;
cout<<ans<<"\n";
}
int main(){
ios::sync_with_stdio(false);
cin.tie(0);
mob[1]=1;
for(int i=2;i<MAXN;i++){
int val = -1-mob[i];
for(int j=2*i;j<MAXN;j+=i)mob[j]+=val;
mob[i]=val;
}
int t=1;
cin>>t;
for(int i=1;i<=t;i++)solve();
return 0;
}
Details
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Test #1:
score: 100
Accepted
time: 502ms
memory: 42684kb
input:
10 1 2 3 4 5 6 7 8 9 10
output:
0 6 20 62 140 306 536 938 1492 2306
result:
ok 10 lines
Test #2:
score: 0
Accepted
time: 530ms
memory: 42460kb
input:
100 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100
output:
0 6 20 62 140 306 536 938 1492 2306 3296 4722 6460 8830 11568 14946 18900 23926 29544 36510 44388 53586 63648 75674 88948 104374 121032 139966 160636 184466 209944 239050 270588 305478 342480 383370 427020 475830 527280 583338 642900 708798 777912 854022 934604 21071 111365 209991 313609 425767 5425...
result:
ok 100 lines
Test #3:
score: -100
Time Limit Exceeded
input:
1000 999000 999001 999002 999003 999004 999005 999006 999007 999008 999009 999010 999011 999012 999013 999014 999015 999016 999017 999018 999019 999020 999021 999022 999023 999024 999025 999026 999027 999028 999029 999030 999031 999032 999033 999034 999035 999036 999037 999038 999039 999040 999041 9...