제출 #205563

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
205563		jh05013	절취선 (JOI14_ho_t5)	C++17	20 / 100	160 ms	9868 KiB

2014_ho_t5

#include <bits/stdc++.h>
#define sz(X) (int)((X).size())
#define entire(X) X.begin(),X.end()
using namespace std; typedef long long ll;
void OJize(){cin.tie(NULL);ios_base::sync_with_stdio(false);}
template <class T1, class T2>ostream&operator<<(ostream &os,pair<T1,T2>const&x){os<<'('<<x.first<<", "<<x.second<<')';return os;}
template <class Ch, class Tr, class Container>basic_ostream<Ch,Tr>&operator<<(basic_ostream<Ch,Tr>&os,Container const&x){for(auto&y:x)os<<y<<" ";return os;}
 
template <typename T>
struct Compress{
    int n; vector<T> arr;
    void add(T x){arr.push_back(x); n++;}
    void init(){sort(entire(arr)), 
        arr.erase(unique(entire(arr)), arr.end()), n=arr.size();}
    int lb(T x){return lower_bound(entire(arr), x) - arr.begin();}
};
 
template <typename T>
struct Fenwick{
    int n; vector<T> arr;
    Fenwick(int N): n{N}, arr(N) {}
    void add(int i, T val){
        while(i < n) arr[i]+= val, i |= i+1;
    }
    T getsum(int i){
        T res = 0;
        while(i >= 0) res+= arr[i], i = (i&(i+1))-1;
        return res;
    }
    T intersum(int i, int j){
        if(j < i) return 0;
        return i? (getsum(j) - getsum(i-1)) : getsum(j);
    }
};
 
int main(){OJize();
    int w,h,n; cin>>w>>h>>n;
    vector<tuple<int,int,int,int>> ev; // y, type, l, r
    Compress<int> C;
    C.add(0), C.add(w);
    // type 1 = vertical start (uses l=r)
    // type 2 = horizontal (uses l, r)
    // type 3 = vertical end (uses l=r)
    for(int i=0; i<n; i++){
        int xa,ya,xb,yb; cin>>xa>>ya>>xb>>yb;
        C.add(xa), C.add(xb);
        if(xa == xb){
            ev.push_back({ya, 1, xa, xb});
            ev.push_back({yb, 3, xa, xb});
        }
        else ev.push_back({ya, 2, xa, xb});
    }
    ev.push_back({0,2,0,w}), ev.push_back({h,2,0,w});
    ev.push_back({0,1,0,0}), ev.push_back({0,1,w,w});
    ev.push_back({h,3,0,0}), ev.push_back({h,3,w,w});
    C.init(), sort(entire(ev));
    Fenwick<int> F(sz(C.arr));
 
    // count V and E
    ll V=0, E=0, COMP=0;
    for(auto [y,ty,x1,x2]: ev){
        x1 = C.lb(x1), x2 = C.lb(x2);
        if(ty == 1){
            F.add(x1, 1);
            V++;
        }
        else if(ty == 2){
            // how many intersections inside the bar?
            ll ic = F.intersum(x1, x2);
            V+= ic+2;
            E+= 2*ic+1;
        }
        else if(ty == 3){
            F.add(x1, -1);
            V++; E++;
        }
        //cout<<y<<' '<<ty<<' '<<x1<<' '<<x2<<' '<<V<<endl;
    }
    COMP = 1; // subtask 4
 
    cout << E-V+COMP;
}

컴파일 시 표준 에러 (stderr) 메시지

2014_ho_t5.cpp: In function 'int main()':
2014_ho_t5.cpp:61:25: warning: unused variable 'y' [-Wunused-variable]
     for(auto [y,ty,x1,x2]: ev){
                         ^

• Subtask 1: 0 / 5
• Subtask 2: 0 / 5
• Subtask 3: 0 / 20
• Subtask 4: 20 / 20
• Subtask 5: 0 / 50