#define _CRT_SECURE_NO_WARNINGS
#include <iostream>
#include <string>
#include <algorithm>
#include <cstring>
#include <cstdio>
#include <sstream>
#include <map>
#include <stack>
#include <set>
#include <queue>
#include <unordered_set>
#include <unordered_map>
#include <math.h>
#include <cmath>
#include <vector>
#include <iomanip>
#include <random>
#include <chrono>
using namespace std;
#define ll long long
#define fr first
#define sc second
#define pb push_back
#define US freopen("milkvisits.in", "r", stdin); freopen("milkvisits.out", "w", stdout);
ll gcd(ll a, ll b)
{
if (a == 0 || b == 0) {
return max(a, b);
}
if (a <= b) {
return gcd(a, b % a);
}
else {
return gcd(a % b, b);
}
}
ll lcm(ll a, ll b) {
return (a / gcd(a, b)) * b;
}
const int N = 300005;
const ll oo = 1000000000000000, MOD = 1000000007;
struct str {
int mn, sm;
};
int sz = 1;
str t[3 * N][3];
void init(int n) {
while (sz < n) {
sz *= 2;
}
}
void seet1(int l, int r, int i, int val, int lx, int rx, int x) {
if (lx > r || rx < l) {
return;
}
if (l <= lx && rx <= r) {
t[x][i].sm += val;
t[x][i].mn += val;
return;
}
int m = (lx + rx) / 2;
seet1(l, r, i,val, lx, m, 2 * x);
seet1(l, r, i, m + 1,val, rx, 2 * x + 1);
t[x][i].mn = min(t[2 * x][i].mn, t[2 * x + 1][i].mn);
t[x][i].mn += t[x][i].sm;
}
void solve() {
int q;
cin >> q;
int y = 0, mx = 0;
init(q);
while (q--) {
int r, s;
cin >> r >> s;
if (r > mx) {
mx = r, y = s;
}
if (s == 2) {
seet1(1, r, 1,1, 1, sz, 1);
seet1(1, r, 2, -1, 1, sz, 1);
}
else {
seet1(1, r, 2, 1,1,sz, 1);
seet1(1,r, 1,-1, 1, sz, 1);
}
if (y == 2) {
if (t[1][1].mn >= 0) {
cout << "<" << endl;
}
else {
cout << "?" << endl;
}
}
else {
if (t[1][2].mn >= 0) {
cout << ">" << endl;
}
else {
cout << "?" << endl;
}
}
}
}
int main() {
ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL);
//US
int tt = 1;
//cin >> tt;
while (tt--) {
solve();
}
}
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
1 ms |
2392 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
