oj.uz

답안 #115677

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
115677 2019-06-08T14:54:46 Z gs18065 허수아비 (JOI14_scarecrows) C++14
100 / 100
 358 ms 36704 KB 
#include <bits/stdc++.h>
#define N 262150
using namespace std;
int n,d[N],num,lev,loc[N];
long long int ans;
typedef pair<int,int> pii;

struct emp{
    int s,e,in;
}p[N];
bool cmp1(emp a,emp b){
    return a.s<b.s;
}
vector<int> m[N];
int read_tree(int x,vector<int> &tree){
    int y=0;
    while(x>0){
        y=max(tree[x],y);
        x-=(x&-x);
    }
    return y;
}
void update_tree(int x,int y,vector<int> &tree){
    if(x<=0) return;
    while(x<tree.size()){
        tree[x]=max(tree[x],y);
        x+=(x&-x);
    }
}
void merge_sort(int x,int y,int s,int e){
    vector<int> l,r,tree(y+5,0);
    vector<pii> st;
    int j=0;
    for(int i=0;i<y;i++){
        l.push_back(m[x-1][s+i]);
        r.push_back(m[x-1][e+i]);
    }
    merge(l.begin(),l.end(),r.begin(),r.end(),back_inserter(m[x]));
    for(int i=0;i<y;i++){
        while(j<y&&l[j]<r[i]){
            while(!st.empty()){
                if(st[st.size()-1].second>loc[l[j]]) break;
                st.pop_back();
            }
            st.push_back({l[j],loc[l[j]]});
            j++;
        }
        int t=read_tree(loc[r[i]]-e,tree);
        ans+=(st.end()-upper_bound(st.begin(),st.end(),make_pair(t,0)));
        update_tree(loc[r[i]]-e,r[i],tree);
    }
}
void make_mst(int x,int y){
    if(x>lev)return;
    for(int i=0;i<num/(2*y);i++){
        merge_sort(x,y,2*i*y,(2*i+1)*y);
    }
    make_mst(x+1,y*2);
}

int main(){
    scanf("%d",&n);
    for(int i=0;i<n;i++){
        scanf("%d %d",&p[i].s,&p[i].e);
    }
    sort(p,p+n,cmp1);
    for(int i=0;i<n;i++){
        p[i].s=p[i].e;
        p[i].in=i;
    }
    sort(p,p+n,cmp1);
    for(int i=0;i<n;i++){
        d[p[i].in]=i+1;
    }
    while(1){
        num=1<<lev;
        if(num>=n) break;
        lev++;
    }
    for(int i=0;i<n;i++){
        loc[d[i]]=i+1;
    }
    for(int i=0;i<num;i++){
        m[0].push_back(d[i]);
    }
    make_mst(1,1);
    printf("%lld",ans);
}

Compilation message

scarecrows.cpp: In function 'void update_tree(int, int, std::vector<int>&)':
scarecrows.cpp:25:12: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     while(x<tree.size()){
           ~^~~~~~~~~~~~
scarecrows.cpp: In function 'int main()':
scarecrows.cpp:62:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d",&n);
     ~~~~~^~~~~~~~~
scarecrows.cpp:64:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d %d",&p[i].s,&p[i].e);
         ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 8 ms 6528 KB Output is correct
2 Correct 8 ms 6528 KB Output is correct
3 Correct 7 ms 6528 KB Output is correct
4 Correct 9 ms 6656 KB Output is correct
5 Correct 8 ms 6528 KB Output is correct
6 Correct 8 ms 6528 KB Output is correct
7 Correct 8 ms 6528 KB Output is correct
8 Correct 7 ms 6528 KB Output is correct
9 Correct 7 ms 6528 KB Output is correct
10 Correct 6 ms 6528 KB Output is correct

Subtask #2
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 12 ms 7168 KB Output is correct
2 Correct 16 ms 7168 KB Output is correct
3 Correct 13 ms 7168 KB Output is correct
4 Correct 13 ms 7168 KB Output is correct
5 Correct 14 ms 7040 KB Output is correct
6 Correct 14 ms 7168 KB Output is correct
7 Correct 14 ms 7168 KB Output is correct
8 Correct 13 ms 7140 KB Output is correct
9 Correct 14 ms 7168 KB Output is correct
10 Correct 15 ms 7168 KB Output is correct
11 Correct 14 ms 7168 KB Output is correct
12 Correct 13 ms 7168 KB Output is correct

Subtask #3
85.0 / 85.0

# 결과 실행 시간 메모리 Grader output
1 Correct 237 ms 33536 KB Output is correct
2 Correct 357 ms 36704 KB Output is correct
3 Correct 267 ms 36616 KB Output is correct
4 Correct 242 ms 36588 KB Output is correct
5 Correct 280 ms 36488 KB Output is correct
6 Correct 347 ms 36608 KB Output is correct
7 Correct 341 ms 36672 KB Output is correct
8 Correct 352 ms 36588 KB Output is correct
9 Correct 219 ms 36552 KB Output is correct
10 Correct 289 ms 36492 KB Output is correct
11 Correct 315 ms 36704 KB Output is correct
12 Correct 344 ms 36664 KB Output is correct
13 Correct 358 ms 36660 KB Output is correct
14 Correct 221 ms 36572 KB Output is correct
15 Correct 314 ms 36484 KB Output is correct
16 Correct 354 ms 36492 KB Output is correct
17 Correct 184 ms 22400 KB Output is correct
18 Correct 337 ms 36588 KB Output is correct
19 Correct 327 ms 36552 KB Output is correct
20 Correct 340 ms 36584 KB Output is correct