#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
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);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
1 ms |
340 KB |
Output is correct |
| 2 |
Correct |
0 ms |
340 KB |
Output is correct |
| 3 |
Correct |
1 ms |
340 KB |
Output is correct |
| 4 |
Correct |
1 ms |
340 KB |
Output is correct |
| 5 |
Correct |
1 ms |
324 KB |
Output is correct |
| 6 |
Correct |
1 ms |
340 KB |
Output is correct |
| 7 |
Correct |
1 ms |
340 KB |
Output is correct |
| 8 |
Correct |
1 ms |
340 KB |
Output is correct |
| 9 |
Correct |
1 ms |
340 KB |
Output is correct |
| 10 |
Correct |
5 ms |
1108 KB |
Output is correct |
| 11 |
Correct |
29 ms |
3924 KB |
Output is correct |
| 12 |
Correct |
60 ms |
7284 KB |
Output is correct |
| 13 |
Correct |
44 ms |
7340 KB |
Output is correct |
| 14 |
Correct |
45 ms |
7340 KB |
Output is correct |
| 15 |
Correct |
43 ms |
7424 KB |
Output is correct |
| 16 |
Correct |
45 ms |
7384 KB |
Output is correct |
| 17 |
Correct |
43 ms |
7372 KB |
Output is correct |
| 18 |
Correct |
40 ms |
7420 KB |
Output is correct |
| 19 |
Correct |
40 ms |
7432 KB |
Output is correct |
| 20 |
Correct |
38 ms |
7372 KB |
Output is correct |
| 21 |
Correct |
39 ms |
7500 KB |
Output is correct |
| 22 |
Correct |
47 ms |
7436 KB |
Output is correct |
| 23 |
Correct |
43 ms |
7424 KB |
Output is correct |
| 24 |
Correct |
40 ms |
7328 KB |
Output is correct |
| 25 |
Correct |
39 ms |
7364 KB |
Output is correct |
