/** made by amunduzbaev **/
#include <bits/stdc++.h>
using namespace std;
#define ff first
#define ss second
#define pb push_back
#define mp make_pair
#define ub upper_bound
#define lb lower_bound
#define ll long long
#define ld long double
#define pii pair<int, int>
#define pll pair<ll, ll>
#define sz(x) (int)x.size()
#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(),x.rend()
#define fastios ios::sync_with_stdio(0);cin.tie(0);cout.tie(0);
#define vll vector<ll>
#define vii vector<int>
const int N = 1e5+5;
const int mod = 1e9+7;
const ll inf = 1e18;
const ld Pi = acos(-1);
ll n, m, k, ans, s;
struct node{
bool flag;
ll mx, mn, v;
};
vector<node> tree;
void push(int x, int lx, int rx){
if(lx == rx || !tree[x].flag) return;
tree[(x<<1)].flag = tree[(x<<1)+1].flag = 1;
tree[(x<<1)].v = tree[(x<<1)+1].v = tree[x].v;
tree[(x<<1)].mn += tree[x].v;
tree[(x<<1)].mx += tree[x].v;
tree[(x<<1)+1].mn += tree[x].v;
tree[(x<<1)+1].mx += tree[x].v;
tree[x].v = tree[x].flag = 0;
tree[x].mn = min(tree[(x<<1)].mn, tree[(x<<1)+1].mn);
tree[x].mx = max(tree[(x<<1)].mx, tree[(x<<1)+1].mx);
}
void sett(int l, int r, ll v, int lx, int rx, int x){
//cout<<l<<" "<<r<<" "<<lx<<" "<<rx<<endl;
if(lx > r || rx < l) return;
push(x, lx, rx);
if(lx >= l && rx <= r) {
tree[x].flag = 1;
tree[x].mn += v;
tree[x].mx += v;
tree[x].v = v;
return ;
}
int m = (lx + rx)>>1;
sett(l, r, v, lx, m, (x<<1));
sett(l, r, v, m+1, rx, (x<<1)+1);
tree[x].mn = min(tree[(x<<1)].mn, tree[(x<<1)+1].mn);
tree[x].mx = max(tree[(x<<1)].mx, tree[(x<<1)+1].mx);
}
void solve(){
fastios
cin>>n;
s = 2;
while(s < n) s<<=1;
tree.assign(s*2, {0, 0, 0, 0});
for(int i=0;i<n;i++){
cin>>m>>k;
sett(1, m, (k == 1 ? -1 : 1), 1, s, 1);
ll mx = tree[1].mx;
ll mn = tree[1].mn;
if(mn >= 0) cout<<"<\n";
else if(mx <= 0) cout<<">\n";
else cout<<"?\n";
}
return;
}
int main(){
fastios
int t = 1;
if(t) solve();
else {
cin>>t;
while (t--) solve();
}
return 0;
}
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
1 ms |
364 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
