Submission #673563

#	Time	Username	Problem	Language	Result	Execution time	Memory
673563		Baytoro	Weighting stones (IZhO11_stones)	C++17	100 / 100	60 ms	7500 KiB

stones

#include <bits/stdc++.h>
using namespace std;
#define ios ios::sync_with_stdio(false); cin.tie(NULL);
#define pb push_back
#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()
#define fr first
#define sc second
#define int long long
#define endl '\n'
void fopn(string name){
	freopen((name+".in").c_str(),"r",stdin);
	freopen((name+".out").c_str(),"w",stdout);
}
const int INF=1e18,mod=998244353;
int n;
const int N=1e5+5;
int mn[4*N],mx[4*N],lazy[4*N];
void push(int l, int r, int x){
	if(lazy[x]){
		mn[x]+=lazy[x];
		mx[x]+=lazy[x];
		if(l!=r){
			lazy[2*x]+=lazy[x];
			lazy[2*x+1]+=lazy[x];
		}
		lazy[x]=0;
	}
}
void update(int lx, int rx, int v, int x=1,int l=1, int r=n){
	push(l,r,x);
	if(l>rx || r<lx) return;
	if(lx<=l && r<=rx){
		lazy[x]+=v;
		push(l,r,x);
		return;
	}
	int md=(l+r)/2;
	update(lx,rx,v,2*x,l,md);
	update(lx,rx,v,2*x+1,md+1,r);
	mx[x]=max(mx[2*x],mx[2*x+1]);
	mn[x]=min(mn[2*x],mn[2*x+1]);
}
void solve(){
	cin>>n;
	for(int i=0;i<n;i++){
		int t,x;
		cin>>t>>x;
		int k=1;
		if(x==2) k=-1;
		update(1,t,k);
		if(mx[1]>0 && mn[1]>=0){
			cout<<">\n";
		}
		else if(mx[1]<=0 && mn[1]<0){
			cout<<"<\n";
		}
		else
			cout<<"?\n";
	}
}
main(){
	//fopn("newbarn");
	ios;
	int T=1;
	//cin>>T;
	while(T--){
		solve();
	}
}

Compilation message (stderr)

stones.cpp:62:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   62 | main(){
      | ^~~~
stones.cpp: In function 'void fopn(std::string)':
stones.cpp:12:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   12 |  freopen((name+".in").c_str(),"r",stdin);
      |  ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
stones.cpp:13:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   13 |  freopen((name+".out").c_str(),"w",stdout);
      |  ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 100 / 100