Submission #673794

#	Time	Username	Problem	Language	Result	Execution time	Memory
673794		smartmonky	Weighting stones (IZhO11_stones)	C++14	100 / 100	181 ms	4420 KiB

stones

#include <bits/stdc++.h>

#define ff first
#define ss second
#define pb push_back
#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()
//#define int long long

using namespace std;

void fp(string name){freopen((name+".in").c_str(),"r",stdin); freopen((name+".out").c_str(),"w",stdout);}
const int N =  100001;
pair <int,int> t[N * 4];
int add[N * 4], mn;
int n;
void push(int v, int l, int r){
	if(l != r && add[v]){
		add[v * 2] += add[v];
		add[v * 2 + 1] += add[v];
	}
	t[v].ff += add[v];
		t[v].ss += add[v];
		add[v] = 0;
}
void update(int l, int r,int val, int v = 1, int tl = 1, int tr = n){
	push(v, tl, tr);
	if(tl > r || tr < l)
		return;
	if(tl >= l && tr <= r){
		add[v] += val;
		push(v, tl, tr);
		return;
	}
	int mid = (tl + tr) >> 1;
	update(l, r, val, v * 2, tl, mid);
	update(l, r, val, v * 2 + 1, mid + 1, tr);
	t[v].ff = min(t[v * 2].ff, t[v * 2 + 1].ff);
	t[v].ss = max(t[v * 2].ss, t[v * 2 + 1].ss);
}
pair <int,int> get(int l, int r, int v = 1, int tl = 1, int tr = n){
	push(v, tl, tr);
	if(tl > r || tr < l)
		return {1e9, -1e9};
	if(tl >= l && tr <= r){
		return t[v];
	}
	int mid = (tl + tr) >> 1;
	pair <int,int> left = get(l, r, v * 2, tl, mid);
	pair <int,int> right = get(l, r, v * 2 + 1, mid + 1, tr);
	return {min(left.ff, right.ff), max(left.ss, right.ss)};
}
main(){
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	cout.tie(0);
	cin >> n;
	for(int i = 1; i <= n; i++){
		int r, s;
		cin >> r >> s;
		int dob = 1;
		if(s == 2)
			dob = -1;
		update(1, r, dob);
		pair <int,int> res = get(1, n);
		if(res.ss <= 0){
			cout << "<";
		}else if(res.ff >= 0){
			cout << ">";
		}else
			cout <<"?";
		cout << endl;
	}
}

Compilation message (stderr)

stones.cpp:53:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   53 | main(){
      | ^~~~
stones.cpp: In function 'void fp(std::string)':
stones.cpp:12:29: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   12 | void fp(string name){freopen((name+".in").c_str(),"r",stdin); freopen((name+".out").c_str(),"w",stdout);}
      |                      ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
stones.cpp:12:70: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   12 | void fp(string name){freopen((name+".in").c_str(),"r",stdin); freopen((name+".out").c_str(),"w",stdout);}
      |                                                               ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 100 / 100