#include<bits/stdc++.h>
using namespace std;
#define scl(x) scanf("%lld",&x)
#define sc(x) scanf("%d",&x)
#define ll long long
#define lop(i,n) for(int i=0;i<n;++i)
typedef pair<int, int> ii;
typedef pair<ll, ll> pll;
const int N=1e5+100,LG=24;
int tree[N*LG],L[N*LG],R[N*LG],ne;
int dp[N];
void build(int root,int s,int e){
if(s==e)return;
L[root]=ne++;
R[root]=ne++;
int m=s+((e-s)>>1);
build(L[root],s,m);
build(R[root],m+1,e);
}
void upd(int nroot,int root,int s,int e,int i,int val){
if(s==e){
tree[nroot]=max(val,tree[root]);
return;
}
int m=s+((e-s)>>1);
if(i<=m){
L[nroot]=ne++;
R[nroot]=R[root];
upd(L[nroot],L[root],s,m,i,val);
}
else {
L[nroot]=L[root];
R[nroot]=ne++;
upd(R[nroot],R[root],m+1,e,i,val);
}
tree[nroot]=max(tree[L[nroot]],tree[R[nroot]]);
}
int get(int root,int s,int e,int l,int r){
if(e<l||s>r)return 0;
if(s>=l&&e<=r)return tree[root];
int m=s+((e-s)>>1);
return max(get(L[root],s,m,l,r),get(R[root],m+1,e,l,r));
}
struct node{
int a,b,c,d;
bool operator<(const node &o)const{
return a<o.a;
}
}arr[N];
int n;
vector<int> uncom;
int roots[N];
int main(){
#ifndef ONLINE_JUDGE
//freopen("i.txt","r",stdin);
#endif
sc(n);
lop(i,n){
sc(arr[i].a),sc(arr[i].b);
sc(arr[i].c),sc(arr[i].d);
uncom.push_back(arr[i].c);
}
uncom.push_back(1e9+1);
sort(uncom.begin(),uncom.end());
uncom.erase(unique(uncom.begin(),uncom.end()),uncom.end());
lop(i,n){
arr[i].c=lower_bound(uncom.begin(),uncom.end(),arr[i].c)-uncom.begin();
arr[i].d=upper_bound(uncom.begin(),uncom.end(),arr[i].d)-uncom.begin();
}
sort(arr,arr+n);
arr[n].a=1e9+1;
roots[n]=ne++;
build(roots[n],0,uncom.size()-1);
for(int i=n-1;i>=0;i--){
node qr;
qr.a=arr[i].b;
int start=upper_bound(arr+i+1,arr+n+1,qr)-arr;
dp[i]=1+get(roots[start],0,uncom.size()-1,arr[i].d,uncom.size()-1);
roots[i]=ne++;
upd(roots[i],roots[i+1],0,uncom.size()-1,arr[i].c,dp[i]);
}
printf("%d\n",dp[0]);
}
Compilation message
trapezoid.cpp: In function 'int main()':
trapezoid.cpp:5:21: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
#define sc(x) scanf("%d",&x)
~~~~~^~~~~~~~~
trapezoid.cpp:62:2: note: in expansion of macro 'sc'
sc(n);
^~
trapezoid.cpp:64:15: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
sc(arr[i].a),sc(arr[i].b);
^
trapezoid.cpp:64:15: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
trapezoid.cpp:65:15: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
sc(arr[i].c),sc(arr[i].d);
^
trapezoid.cpp:65:15: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
2 ms |
376 KB |
Unexpected end of file - int32 expected |
| 2 |
Incorrect |
2 ms |
376 KB |
Unexpected end of file - int32 expected |
| 3 |
Incorrect |
3 ms |
528 KB |
Unexpected end of file - int32 expected |
| 4 |
Incorrect |
3 ms |
872 KB |
Unexpected end of file - int32 expected |
| 5 |
Incorrect |
4 ms |
1016 KB |
Unexpected end of file - int32 expected |
| 6 |
Incorrect |
6 ms |
1332 KB |
Unexpected end of file - int32 expected |
| 7 |
Incorrect |
7 ms |
1660 KB |
Unexpected end of file - int32 expected |
| 8 |
Incorrect |
10 ms |
2012 KB |
Unexpected end of file - int32 expected |
| 9 |
Incorrect |
16 ms |
3396 KB |
Unexpected end of file - int32 expected |
| 10 |
Incorrect |
31 ms |
6316 KB |
Unexpected end of file - int32 expected |
| 11 |
Incorrect |
38 ms |
8140 KB |
Unexpected end of file - int32 expected |
| 12 |
Incorrect |
78 ms |
15844 KB |
Unexpected end of file - int32 expected |
| 13 |
Incorrect |
99 ms |
19940 KB |
Unexpected end of file - int32 expected |
| 14 |
Incorrect |
124 ms |
24720 KB |
Unexpected end of file - int32 expected |
| 15 |
Incorrect |
137 ms |
27980 KB |
Unexpected end of file - int32 expected |
| 16 |
Incorrect |
158 ms |
31384 KB |
Unexpected end of file - int32 expected |
| 17 |
Incorrect |
154 ms |
35120 KB |
Unexpected end of file - int32 expected |
| 18 |
Incorrect |
134 ms |
38796 KB |
Unexpected end of file - int32 expected |
| 19 |
Incorrect |
144 ms |
42696 KB |
Unexpected end of file - int32 expected |
| 20 |
Incorrect |
202 ms |
46868 KB |
Unexpected end of file - int32 expected |
