Submission #345563

#	Time	Username	Problem	Language	Result	Execution time	Memory
345563		Kerim	Examination (JOI19_examination)	C++17	2 / 100	3043 ms	12380 KiB

examination

#include "bits/stdc++.h"
#define MAXN 100009
#define INF 1000000007
#define mp(x,y) make_pair(x,y)
#define all(v) v.begin(),v.end()
#define pb(x) push_back(x)
#define wr cout<<"----------------"<<endl;
#define ppb() pop_back()
#define tr(ii,c) for(__typeof((c).begin()) ii=(c).begin();ii!=(c).end();ii++)
#define ff first
#define ss second
#define my_little_dodge 46
#define debug(x)  cerr<< #x <<" = "<< x<<endl;
using namespace std;

typedef long long ll;
typedef pair<int,int> PII;
template<class T>bool umin(T& a,T b){if(a>b){a=b;return 1;}return 0;}
template<class T>bool umax(T& a,T b){if(a<b){a=b;return 1;}return 0;}
int a[MAXN],b[MAXN],c[MAXN],id[MAXN];
int x[MAXN],y[MAXN],z[MAXN],di[MAXN];
vector<int>v;
int en[MAXN],bel[MAXN],cur,sz,n,q;
bool cmp(int xx,int yy){
	return (a[xx]>a[yy]);	
}
bool cmp1(int xx,int yy){
	return (x[xx]>x[yy]);	
}
int who(int x){
	return (lower_bound(all(v),x)-v.begin())+1;
}
void init(){
	int BLOK=sqrt(n);cur=1;
	for(int i=1;i<=n;i++){
		bel[i]=cur;
		if(i%BLOK==0){
			if(i==n)
				en[cur]=i;
			else
				en[cur++]=i;
		}
	}en[cur]=n;
}
vector<int>adj[MAXN];
int arr[MAXN],ans[MAXN];
void upd(int p,int v){
	arr[p]=v;
	adj[bel[p]].pb(v);
	sort(all(adj[bel[p]]));
}
int get(int p,int v){
	if(p<1 or p>n)return 0;
	int ans=0;
	for(int i=p;i<=en[bel[p]];i++)
		ans+=(arr[i]>=v);
	for(int i=bel[p]+1;i<=cur;i++)
		if(!adj[i].empty())
			tr(it,adj[i])
				ans+=(*it>=v);
			//ans+=int(adj[i].size())-int(lower_bound(all(adj[i]),v)-adj[i].begin());
	return ans;
}
int can[MAXN];
int main(){
	memset(arr,-1,sizeof arr);
   // freopen("file.in", "r", stdin);
    scanf("%d%d",&n,&q);
    vector<PII>g;
    for(int i=1;i<=n;i++){
    	scanf("%d%d",a+i,b+i);
    	c[i]=a[i]+b[i];
    	id[i]=i;
		v.pb(b[i]);
		g.pb(mp(b[i],i));
    }
    sort(all(v));sort(all(g));
    for(int i=0;i<n;i++)
    	can[g[i].ss]=i+1;
    init();
    sort(id+1,id+n+1,cmp);
    for(int i=1;i<=q;i++)
    	scanf("%d%d%d",x+i,y+i,z+i),di[i]=i;
    sort(di+1,di+q+1,cmp1);
    int p=1;
    for(int i=1;i<=q;i++){
    	while(p<=n and a[id[p]]>=x[di[i]])
    		upd(can[id[p]],c[id[p]]),p++;
    	ans[di[i]]=get(who(y[di[i]]),z[di[i]]);
    }
    for(int i=1;i<=q;i++)
    	printf("%d\n",ans[i]);
	return 0;
}

Compilation message (stderr)

examination.cpp: In function 'int main()':
examination.cpp:91:5: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
   91 |     for(int i=1;i<=q;i++)
      |     ^~~
examination.cpp:93:2: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
   93 |  return 0;
      |  ^~~~~~
examination.cpp:68:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   68 |     scanf("%d%d",&n,&q);
      |     ~~~~~^~~~~~~~~~~~~~
examination.cpp:71:11: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   71 |      scanf("%d%d",a+i,b+i);
      |      ~~~~~^~~~~~~~~~~~~~~~
examination.cpp:83:11: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   83 |      scanf("%d%d%d",x+i,y+i,z+i),di[i]=i;
      |      ~~~~~^~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 2 / 2
• Subtask 2: 0 / 20
• Subtask 3: 0 / 21
• Subtask 4: 0 / 57