#include <bits/stdc++.h>
#include <bits/extc++.h>
using namespace __gnu_pbds;
using namespace std;
// #pragma GCC optimize("Ofast")
// #pragma GCC optimize ("unroll-loops")
// #pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")
#define ff first
#define sc second
#define pb push_back
#define ll long long
#define pll pair<ll, ll>
#define pii pair<int, int>
#define ull unsigned long long
#define all(x) (x).begin(),(x).end()
#define rall(x) (x).rbegin(),(x).rend()
#define int long long
// #define int unsigned long long
// #define ordered_set(T) tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>
// #define ordered_multiset(T) tree<T, null_type, less_equal<T>, rb_tree_tag, tree_order_statistics_node_update>
void open_file(string filename) {
freopen((filename + ".in").c_str(), "r", stdin);
freopen((filename + ".out").c_str(), "w", stdout);
}
// const ll mod = 1e9 + 7;
// const ll mod = 998244353;
const ll inf = 1e9;
const ll biginf = 1e18;
const int maxN = 1e6 + 305;
vector<int> g[maxN];
int n, q, d[3][maxN];
int build(int v, int tl, int tr) {
if (tl == tr) return tl;
int tm = (tl + tr) / 2;
int x = build(2 * v, tl, tm);
int y = build(2 * v + 1, tm + 1, tr);
g[x].pb(v); g[y].pb(v);
return v + n;
}
void update(int v, int tl, int tr, int l, int r, int pos) {
if (r < tl || tr < l) return;
if (l <= tl && tr <= r) {
if (tl == tr) g[tl].pb(pos);
else g[v + n].pb(pos);
return;
} int tm = (tl + tr) / 2;
update(2 * v, tl, tm, l, r, pos);
update(2 * v + 1, tm + 1, tr, l, r, pos);
}
void dijkstra(int _) {
set<pii> st;
for (int i = 1; i <= n; i++) {
if (d[_][i]) st.insert({d[_][i], i});
else d[_][i] = maxN;
} while (!st.empty()) {
pii cur = *st.begin();
st.erase(st.begin());
int w = cur.ff, x = cur.sc;
for (int u : g[x]) {
if (u <= n && d[_][u] > w + 1) {
st.erase({d[_][u], u});
d[_][u] = w + 1;
st.insert({d[_][u], u});
} else if (d[_][u] > w) {
st.erase({d[_][u], u});
d[_][u] = w;
st.insert({d[_][u], u});
}
}
}
}
void solve() {
cin >> n;
if (n == 1) {
cout << 0; return;
}
build(1, 1, n);
int l[n + 1], r[n + 1];
for (int i = 1; i <= n; i++) {
cin >> l[i] >> r[i];
update(1, 1, n, l[i], r[i], i);
} for (int i = 1; i <= n; i++)
if (r[i] == n) d[1][i] = 1;
dijkstra(1);
cin >> q;
while (q--) {
int x; cin >> x; cout << (d[1][x] > n + 5 ? -1 : d[1][x]) << '\n';
}
}
int32_t main() {
ios_base::sync_with_stdio(false);
cin.tie(nullptr); cout.tie(nullptr);
int t = 1;
// cin >> t;
while (t--) {
solve();
cout << '\n';
}
return 0;
}
Compilation message
passport.cpp: In function 'void open_file(std::string)':
passport.cpp:27:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
27 | freopen((filename + ".in").c_str(), "r", stdin);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
passport.cpp:28:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
28 | freopen((filename + ".out").c_str(), "w", stdout);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
6 ms |
26704 KB |
Output is correct |
| 2 |
Incorrect |
6 ms |
26704 KB |
Output isn't correct |
| 3 |
Halted |
0 ms |
0 KB |
- |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
5 ms |
26704 KB |
Output is correct |
| 2 |
Incorrect |
6 ms |
26704 KB |
Output isn't correct |
| 3 |
Halted |
0 ms |
0 KB |
- |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
5 ms |
26704 KB |
Output is correct |
| 2 |
Incorrect |
6 ms |
26704 KB |
Output isn't correct |
| 3 |
Halted |
0 ms |
0 KB |
- |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
5 ms |
26704 KB |
Output is correct |
| 2 |
Incorrect |
6 ms |
26704 KB |
Output isn't correct |
| 3 |
Halted |
0 ms |
0 KB |
- |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
6 ms |
26704 KB |
Output is correct |
| 2 |
Incorrect |
6 ms |
26704 KB |
Output isn't correct |
| 3 |
Halted |
0 ms |
0 KB |
- |
