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QOJ
ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#320631 | #3853. Lines in a grid | algotester# | RE | 0ms | 0kb | C++14 | 2.6kb | 2024-02-03 19:14:39 | 2024-02-03 19:14:39 |
answer
#include "bits/stdc++.h"
using namespace std;
#define FOR(i,a,b) for (int i = (a); i < (b); i++)
#define RFOR(i,b,a) for (int i = (b) - 1; i >= (a); i--)
#define ITER(it,a) for (__typeof(a.begin()) it = a.begin(); it != a.end(); it++)
#define FILL(a,value) memset(a, value, sizeof(a))
#define SZ(a) (int)a.size()
#define ALL(a) a.begin(), a.end()
#define PB push_back
#define MP make_pair
typedef long long LL;
typedef vector<int> VI;
typedef pair<int, int> PII;
const double PI = acos(-1.0);
const int INF = 1000 * 1000 * 1000 + 7;
const LL LINF = INF * (LL) INF;
const int MAX = 10 * 1000 * 1000 * 2;
// const int MAX = 100;
const int MOD = 1000 * 1000 + 3;
LL M[MAX];
LL MX[MAX];
void init()
{
M[1] = 1;
FOR (i,1,MAX)
{
if (!M[i]) continue;
for(int j = 2*i; j<MAX; j+=i)
{
M[j] -= M[i];
}
}
FOR (i, 1, MAX)
{
// M[i] = -M[i];
MX[i] = M[i] * i;
}
FOR (i, 1, MAX)
{
M[i] += M[i-1] + MOD * 3;
MX[i] += MX[i-1] + MOD * 3;
M[i] %= MOD;
MX[i] %= MOD;
}
}
LL calc_segm(int l, int r, int n)
{
LL c = n / l;
LL sm = M[r] - M[l-1] + MOD;
LL smx = MX[r] - MX[l-1] + MOD;
sm %= MOD;
smx %= MOD;
c %= MOD;
LL v1 = (((c * c) % MOD) * sm) % MOD;
LL v2 = ((((c * c) % MOD) * (c + 1) % MOD) * smx) % MOD;
v1 *= n * 2 + 1;
v1 %= MOD;
LL res = v1 - v2 + MOD;
res %= MOD;
return res;
}
LL solve(int n)
{
LL res = 0;
LL x = 1;
LL prev = 1;
while (x <= n)
{
LL y = n / x;
x = n / y + 1;
// cout << prev << ' ' << x - 1 << endl;
// segment [prev , x - 1]
res += calc_segm(prev, x-1, n);
res %= MOD;
prev = x;
}
res *= 2;
if (n != 0) res += 2 * (n + 1);
res %= MOD;
// if (res < 0) res += MOD;
return res;
}
int gcd(int a, int b)
{
if (b == 0) return a;
return gcd(b, a%b);
}
LL brute(int n)
{
n++;
LL res = 0;
FOR (x, 1, n)
{
FOR (y, 1, n)
{
if (gcd(x, y) == 1)
{
res += n - x + n - y - 1;
res %= MOD;
}
}
}
res = res * 2;
if (n != 1) res += 2 * n;
res %= MOD;
return res;
}
int main(int argc, char* argv[])
{
//ios::sync_with_stdio(false); cin.tie(0);
// init();
// FOR (i, 0, 1000)
// {
// cout<<solve(10000000 - i)<<endl;
// }
// return 0;
// FOR (i, 1, 10)
// {
// LL b = brute(i);
// LL x = solve(i);
// cout<<i<<": "<<x<<' '<<b<<' '<<(x == b ? "" : "ASDFASDF")<<endl;
// }
// return 0;
int q;
scanf("%d", &q);
assert(q == 3);
FOR (i, 0, q)
{
int n;
scanf("%d", &n);
n--;
// LL res = solve(n);
LL res = brute(n);
// if (n != 0) res += 2 * (n + 1);
// res %= MOD;
// if (res < 0) res += MOD;
printf("%lld\n", res);
}
}
Details
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Test #1:
score: 0
Runtime Error
input:
10 1 2 3 4 5 6 7 8 9 10