#include <cstdio>
#include <string>
#include <vector>
#include <map>
#include <cstdlib>
#include <algorithm>
#include <cstring>
using namespace std;
typedef long long llint;
typedef pair <int, int> pii;
const int MAXN = 1 << 20;
int n, q;
vector <pii> T[MAXN];
int a[MAXN];
int ls[MAXN], rs[MAXN];
int left[MAXN];
int right[MAXN];
int ans[MAXN];
void update (int x, int l, int r, int L, int v) {
if (L > r || L < l) return;
T[x].push_back({rs[v], v});
int mid = (l + r) / 2;
if (l == r) return;
update(x * 2, l, mid, L, v);
update(x * 2 + 1, mid+1, r, L, v);
}
void query_update (int x, int l, int r, int L, int R, int p1, int p2) {
if (L > r || R < l) return;
if (l >= L && r <= R) {
T[x].push_back({p1, -1});
T[x].push_back({p2, -2});
return;
}
int mid = (l + r) / 2;
query_update(x * 2, l, mid, L, R, p1, p2);
query_update(x * 2 + 1, mid+1, r, L, R, p1, p2);
}
void solve (int x, int l, int r) {
sort(T[x].begin(), T[x].end());
int cnt = 0;
for (auto v: T[x]) {
if (v.second == -1) ++cnt;
else
if (v.second == -2) --cnt;
else ans[v.second] += cnt;
}
if (l == r) return;
int mid = (l+r) / 2;
solve(x*2, l, mid);
solve(x*2+1, mid+1, r);
}
int main (void){
scanf("%d%d", &n, &q);
for (int i = 0; i < n; ++i) scanf("%d", &a[i]);
for (int i = 0; i < q; ++i) {
scanf("%d%d", &ls[i], &rs[i]);
--ls[i]; --rs[i];
update(1, 0, n-1, ls[i], i);
}
map <int, int> M;
for (int i = 0; i < n; ++i) {
int pos = -1;
if (M.count(a[i])) pos = M[a[i]];
left[i] = pos;
M[a[i]] = i;
}
M.clear();
for (int i = n-1; i >= 0; --i) {
int pos = n;
if (M.count(a[i])) pos = M[a[i]];
right[i] = pos;
M[a[i]] = i;
}
right[n] = n;
for (int i = 0; i < n; ++i) {
int rpos = right[i];
if (rpos == n) continue;
query_update(1, 0, n-1, left[i] + 1, i, rpos, right[rpos]);
}
solve(1, 0, n-1);
for (int i = 0; i < q; ++i)
printf("%d\n", ans[i]);
return 0;
}
Compilation message
poklon.cpp: In function 'int main()':
poklon.cpp:62:24: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
scanf("%d%d", &n, &q);
^
poklon.cpp:63:49: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
for (int i = 0; i < n; ++i) scanf("%d", &a[i]);
^
poklon.cpp:65:34: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
scanf("%d%d", &ls[i], &rs[i]);
^
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
6 ms |
50332 KB |
Output is correct |
2 |
Correct |
9 ms |
50464 KB |
Output is correct |
3 |
Correct |
13 ms |
50596 KB |
Output is correct |
4 |
Correct |
23 ms |
51812 KB |
Output is correct |
5 |
Correct |
476 ms |
84328 KB |
Output is correct |
6 |
Correct |
499 ms |
86504 KB |
Output is correct |
7 |
Correct |
1286 ms |
135128 KB |
Output is correct |
8 |
Correct |
2079 ms |
184620 KB |
Output is correct |
9 |
Correct |
3419 ms |
227064 KB |
Output is correct |
10 |
Correct |
4179 ms |
263476 KB |
Output is correct |