//#pragma GCC optimize "-O3"
#include <bits/stdc++.h>
using namespace std;
const int N = 100*1000+7;
int t[3][4*N];
int f[4*N];
void push(int v,int s,int e){
t[1][v]+=((e-s+1)*f[v]);
t[2][v]+=((e-s+1)*f[v]);
if(s!=e){
f[2*v]+=f[v];
f[2*v+1]+=f[v];
}
f[v] = 0;
}
void update(int v,int s,int e,int l,int r,int val){
push(v,s,e);
if(l>r) return;
if(s == l && e == r){
f[v]+=val;
return;
}
int m = (s+e)/2;
update(v*2,s,m,l,min(m,r),val);
update(v*2+1,m+1,e,max(l,m+1),r,val);
push(v*2,s,m);
push(v*2+1,m+1,e);
t[1][v] = max(t[1][v*2],t[1][v*2+1]);
t[2][v] = min(t[2][v*2],t[2][v*2+1]);
}
int main(){
int n;
scanf("%d",&n);
for(int i = 1;i<=n;i++){
int r,s;
scanf("%d%d",&r,&s);
if(s == 1) update(1,1,n,1,r,1);
else update(1,1,n,1,r,-1);
push(1,1,n);
if(t[1][1]>0 && t[2][1]<0){
printf("?\n");
continue;
}
if(t[1][1]>=0 && t[2][1]>=0){
printf(">\n");
continue;
}
printf("<\n");
}
return 0;
}
Compilation message
stones.cpp: In function 'int main()':
stones.cpp:33:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
scanf("%d",&n);
~~~~~^~~~~~~~~
stones.cpp:37:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
scanf("%d%d",&r,&s);
~~~~~^~~~~~~~~~~~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
3 ms |
376 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
