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OI-codes/AcWing/789/789.cpp

43 lines
854 B
C++

#include <bits/stdc++.h>
using namespace std;
int n, q, t, k, a[100005];
int main() {
cin >> n >> q;
for (int i = 0; i < n; i++) {
cin >> a[i];
}
for (int i = 0; i < q; i++) {
cin >> k;
int l = 0;
int r = n - 1;
while (l < r) {
int mid = l + r >> 1;
if (a[mid] >= k) {
r = mid;
} else {
l = mid + 1;
}
}
if (a[l] != k) {
cout << -1 << ' ' << -1 << endl;
continue;
}
cout << l << ' ';
l = 0;
r = n - 1;
while (l < r) {
int mid = l + r + 1 >> 1;
if (a[mid] <= k) {
l = mid;
} else {
r = mid - 1;
}
}
cout << l << endl;
}
return 0;
}