Submission #102098

#	Time	Username	Problem	Language	Result	Execution time	Memory
102098		LittleFlowers__	Examination (JOI19_examination)	C++14	2 / 100	3021 ms	187632 KiB

examination

#include <bits/stdc++.h>
using namespace std;
#define in ({int x=0;int c=getchar(),n=0;for(;!isdigit(c);c=getchar()) n=(c=='-');for(;isdigit(c);c=getchar()) x=x*10+c-'0';n?-x:x;})
inline void out(long long x){if(x<0) putchar('-'),x=-x;if(x>9) out(x/10);putchar(x%10+'0');}
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
int rnd(int l,int r){return l+rng()%(r-l+1);}
#define task "EXAMINATION"
#define forinc(a,b,c) for(int a=b,_c=c;a<=_c;++a)
#define fordec(a,b,c) for(int a=b,_c=c;a>=_c;--a)
#define forv(a,b) for(auto&a:b)
#define fi first
#define se second
#define pb push_back
#define ii pair<int,int>
#define all(a) a.begin(),a.end()
#define reset(f, x) memset(f, x, sizeof(f))
#define bit(x,i) ((x>>(i-1))&1)
#define on(x,i) (x|(1ll<<(i-1)))
#define off(x,i) (x&~(1<<(i-1)))

const int N=100010;
int n,q;
ii a[N];
struct id{
    int x,y,z,i;
}qry[N];

int ans[N];
vector<int> r;
map<int,map<int,int>> bit;

int upp(int i,const vector<int>&v){
    return lower_bound(all(v),i)-v.begin()+1;
}

void add(int t){
    int x,y; x=upp(a[t].fi,r), y=upp(a[t].se,r);
    for(int i=x;i;i-=i&-i)
        for(int j=y;j;j-=j&-j)
            ++bit[i][j];
}
int que(int x,int y){
    x=upp(x,r), y=upp(y,r);
    int ret=0;
    for(int i=x;i<=r.size();i+=i&-i)
        for(int j=y;j<=r.size();j+=j&-j)
            ret+=bit[i][j];
    return ret;
}

main()
{
    //freopen(task".inp","r",stdin);
    n=in,q=in;
    forinc(i,1,n) a[i]={in,in};
    sort(a+1,a+n+1,[](ii i,ii j){return i.fi+i.se>j.fi+j.se;});
    forinc(i,1,q) qry[i]={in,in,in,i};
    sort(qry+1,qry+q+1,[](id i,id j){return i.z>j.z;});

    forinc(i,1,n) r.pb(a[i].fi),r.pb(a[i].se),r.pb(a[i].fi+a[i].se);
    sort(all(r)); r.erase(unique(all(r)),r.end());

    int j=1;
    forinc(i,1,q){
        while(j<=n && a[j].fi+a[j].se>=qry[i].z){
            add(j++);
        }
        ans[qry[i].i]=que(qry[i].x,qry[i].y);
    }
    forinc(i,1,q){
        cout<<ans[i]<<"\n";
    }
}

Compilation message (stderr)

examination.cpp: In function 'int que(int, int)':
examination.cpp:45:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i=x;i<=r.size();i+=i&-i)
                 ~^~~~~~~~~~
examination.cpp:46:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for(int j=y;j<=r.size();j+=j&-j)
                     ~^~~~~~~~~~
examination.cpp: At global scope:
examination.cpp:51:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
 main()
      ^

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