#include <iostream>
#include <vector>
#include <bitset>
#include <array>
#include <unordered_set>
#pragma GCC optimize("O3")
int main()
{
std::cin.tie(0)->sync_with_stdio(0);
// O(N^2logN)
int N,K,Q;
std::cin >> N >> K >> Q;
std::vector<int> A(N);
for(auto& i : A) std::cin >> i;
for(auto& i : A) i--;
std::vector<std::pair<int,int>> xy(Q);
for(auto&[x,y] : xy) std::cin >> x >> y;
std::unordered_set<int> xs;
for(auto&[x,y] : xy) {x--,y--;xs.insert(x);}
std::vector<int> works_max(N);
for(int x = 0; x < N; x++)
{
int l = x;
if(x > 0) l = works_max[x-1];
int r = N;
std::vector<std::vector<int>> reach[2] = {std::vector<std::vector<int>>(K),std::vector<std::vector<int>>(K)};
bool p = 1;
while(r-l>1) // logN repetitions
{
int m = (r+l)/2;
if(p)
for(int i = l+1; i <= m; i++)
{
reach[i%2][A[i]].push_back(A[i-1]); // O(N) total
reach[!(i%2)][A[i-1]].push_back(A[i]);
}
else
for(int i = m+1; i<=r; i++)
{
reach[i%2][A[i]].pop_back();
reach[!(i%2)][A[i-1]].pop_back();
}
bool b = 1;
auto& g = reach[0];
std::vector<int> inct(K);
for(auto& i : g)
for(auto& j : i) inct[j]++; // O(N)
std::vector<int> S;
for(int i = 0; i < K; i++) if(!inct[i]) S.push_back(i);
std::vector<bool> seen(K);
while(S.size()) // O(N)
{
auto n = S.back(); S.pop_back();
seen[n] = true;
for(auto ne : g[n])
{
inct[ne]--;
if(!inct[ne]) S.push_back(ne);
}
}
for(auto i : seen) b &= i;
if(b) l = m;
else r = m;
p = b;
}
works_max[x] = l;
// bool g = 1;
// for(int y = x+1; y < N; y++,g = !g)
// {
// auto a = A[y];
// auto p = A[y-1];
// ltgt[g][a] |= ltgt[g][p];
// ltgt[g][a][p] = true;
// for(auto& i : ltgt[g]) if(i[a]) i |= ltgt[g][a];
// bool b = 0;
// for(int i = 0; i < K; i++) if((ltgt[0][i]<gt[1][i]).any() || ltgt[0][i][i] || ltgt[1][i][i]) b=1;
// if(b) break;
// works_max[x] = y;
// }
}
// for(auto i : works_max) std::cerr << i << "\n";
for (auto[x,y] : xy)
{
std::cout << (works_max[x]>=y ? "YES" : "NO") << "\n";
}
}
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Incorrect |
190 ms |
20684 KB |
Output isn't correct |
2 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Incorrect |
137 ms |
18760 KB |
Output isn't correct |
2 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Incorrect |
1 ms |
348 KB |
Output isn't correct |
2 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Incorrect |
190 ms |
20684 KB |
Output isn't correct |
2 |
Halted |
0 ms |
0 KB |
- |