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QOJ
ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#65555 | #3853. Lines in a grid | UBB_Zalau00# | WA | 847ms | 120660kb | C++14 | 2.3kb | 2022-12-01 18:46:20 | 2022-12-01 18:46:23 |
Judging History
answer
#include <bits/stdc++.h>
using namespace std;
const int NMAX = 10000000;
const int MOD = 1000003;
int is_composite[NMAX + 5];
int mobius[NMAX + 5];
int mobius_times_d[NMAX + 5];
int add(int a, int b){
a += b;
if(a >= MOD){
a -= MOD;
}
return a;
}
int sub(int a, int b){
a -= b;
if(a < 0){
a += MOD;
}
return a;
}
int mult(int a, int b){
return 1LL * a * b % MOD;
}
int main(){
for(int i = 1;i <= NMAX;i++){
mobius[i] = 1;
is_composite[i] = false;
}
for(int i = 2;i <= NMAX;i++){
if(is_composite[i]){
continue;
}
for(int j = i;j <= NMAX;j += i){
mobius[j] *= -1;
}
if(1LL * i * i <= NMAX){
for(int j = i * i; j <= NMAX;j += i * i){
mobius[j] = 0;
}
}
}
for(int i = 1;i <= NMAX;i++){
if(mobius[i] < 0){
mobius[i] = MOD + mobius[i];
}
mobius_times_d[i] = mult(i, mobius[i]);
mobius[i] = add(mobius[i - 1], mobius[i]);
mobius_times_d[i] = add(mobius_times_d[i - 1], mobius_times_d[i]);
}
int q;
scanf("%d", &q);
while(q--){
int n;
scanf("%d", &n);
if(n == 1){
printf("%d\n", 0);
continue;
}
vector<pair<int, int> > ranges;
int max_d = 0;
for(int d = 1; 1LL * d * d < n;d++){
// trb sa bagam
ranges.push_back({d, d});
max_d = d;
}
for(int d = 1; 1LL * d * d < n;d++){
ranges.push_back({(n - 1) / (d + 1) + 1, (n - 1) / d});
if(ranges.back().first <= max_d){
ranges.back().first = max_d + 1;
if(ranges.back().second < ranges.back().first){
ranges.pop_back();
break;
}
}
}
int first_sum = 0;
int second_sum = 0;
for(auto it:ranges){
int value = ((n - 1) / it.first) % MOD;
first_sum = add(first_sum, mult(mult(value, value), sub(mobius[it.second], mobius[it.first - 1])));
second_sum = add(second_sum, mult(mult(mult(value, value),mult(add(value, 1), MOD / 2 + 1)), sub(mobius_times_d[it.second], mobius_times_d[it.first - 1])));
}
//cerr << "debug " << first_sum << " " << second_sum << "\n";
printf("%d\n", add(sub(mult(sub(mult(4, n), 2), first_sum), mult(4, second_sum)), add(n, n)));
}
return 0;
}
Details
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Test #1:
score: 0
Wrong Answer
time: 847ms
memory: 120660kb
input:
10 1 2 3 4 5 6 7 8 9 10
output:
0 6 20 54 108 210 316 510 724 1022
result:
wrong answer 4th lines differ - expected: '62', found: '54'