Submission #337747

#	Time	Username	Problem	Language	Result	Execution time	Memory
337747		amunduzbaev	Weighting stones (IZhO11_stones)	C++14	0 / 100	1 ms	364 KiB

stones

/** 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;
};
node def;
vector<node> tree;

void push(int x, int lx, int rx){
	if(lx == rx){
		tree[x].flag = 0, tree[x].v = 0;
		return;
	}
	if(!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;
	def.flag = 0, def.mn = 0, def.mx = 0, def.v = 0;
	tree.assign(s*2, def);
	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;
}

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