#include<bits/stdc++.h>
#define IOS ios_base::sync_with_stdio(false);cin.tie();cout.tie();
#define all(x) x.begin(), x.end()
#define lnl long long
#define pq priority_queue
#define eb emplace_back
#define lb lower_bound
#define ub upper_bound
#define pb push_back
#define pp pop_back
#define F first
#define S second
using namespace std;
struct lf1 {
int an;
int ah;
void set(int x) {
an = ah = 0;
if (x == 1) an = 1;
else ah = 1;
}
void merge(lf1 x, lf1 y) {
an = x.an; ah = y.ah;
if (y.an < x.ah) ah += x.ah-y.an;
else an += y.an-y.ah;
}
};
struct lf2 {
int an;
int ah;
void set(int x) {
an = ah = 0;
if (x == 1) an = 1;
else ah = 1;
}
void merge(lf2 x, lf2 y) {
an = y.an; ah = x.ah;
if (y.ah < x.an) an += x.an-y.ah;
else ah += y.ah-x.an;
}
};
int n;
pair<int, int> mx;
lf1 S1[400001];
lf2 S2[400001];
void update(int id, int L, int R, int i, int k) {
if (L == R) {S2[id].set(k); S1[id].set(k); return ;}
int M = (L+R)/2, x = 2*id, y = x+1;
if (i <= M) update(x, L, M, i, k);
else update(y, M+1, R, i, k);
S1[id].merge(S1[x], S1[y]);
S2[id].merge(S2[x], S2[y]);
} void update(int i, int k) {update(1, 1, n, i, k);}
void solve () {
cin >> n;
mx = {0, 0};
for (int i = 0; i < n; i++) {
int a, b; cin >> a >> b;
if (mx.F < a) mx = {a, b};
update(a, b);
//cout << mx.S << ' ' << S1[1].an << ' ' << S1[1].ah << ' ' << S2[1].an << ' ' << S2[1].ah << '\n';
if (mx.S == 1) cout << (!S1[1].ah ? ">\n" : "?\n");
else cout << (!S2[1].an ? "<\n" : "?\n");
}
}
int main() {IOS solve(); return 0;}
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
1 ms |
2384 KB |
Output is correct |
| 2 |
Incorrect |
1 ms |
2384 KB |
Output isn't correct |
| 3 |
Halted |
0 ms |
0 KB |
- |
