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Submission #411679

# Submission time Handle Problem Language Result Execution time Memory
411679 2021-05-25T17:54:44 Z Dormi Bread First Search (CCO21_day2problem2) C++14
25 / 25
 226 ms 4992 KB 
#include "bits/stdc++.h"
using namespace std;
using ll = long long;
using pii = pair<int,int>;
using pll = pair<ll,ll>;
template<typename T>
int sz(const T &a){return int(a.size());}
const int MN=2e5+1;
int n;
struct seg{
    struct node{
        int data,lazy;
        node(){
            data=0,lazy=0;
        }
        void apply(int a){
            data+=a;
            lazy+=a;
        }
    }t[2*MN];
    void prop(int ind, int le, int ri){
        int mid=(le+ri)/2;
        int left=ind+1,right=ind+(mid-le+1)*2;
        t[left].apply(t[ind].lazy),t[right].apply(t[ind].lazy);
        t[ind].lazy=0;
    }
    void update(int ind, int le, int ri, int l, int r, int val){
        if(l>ri||r<le||l>r)return;
        if(le>=l&&ri<=r){
            t[ind].apply(val);
            return;
        }
        prop(ind,le,ri);
        int mid=(le+ri)/2;
        int left=ind+1,right=ind+(mid-le+1)*2;
        update(left,le,mid,l,r,val),update(right,mid+1,ri,l,r,val);
        t[ind].data=min(t[left].data,t[right].data);
    }
    int query(int ind, int le, int ri, int l, int r){
        if(l>ri||r<le||l>r)return n+1;
        if(le>=l&&ri<=r)return t[ind].data;
        prop(ind,le,ri);
        int mid=(le+ri)/2;
        int left=ind+1,right=ind+(mid-le+1)*2;
        return min(query(left,le,mid,l,r),query(right,mid+1,ri,l,r));
    }
}tree;
int mostright[MN],mostleft[MN];
int main(){
    cin.tie(NULL);
    ios_base::sync_with_stdio(false);
    int m,a,b;
    cin>>n>>m;
    for(int i=1;i<=n;i++)mostleft[i]=n+1;
    for(int i=0;i<m;i++){
        cin>>a>>b;
        mostleft[a]=min(mostleft[a],b);
        mostleft[b]=min(mostleft[b],a);
        mostright[a]=max(mostright[a],b);
        mostright[b]=max(mostright[b],a);
    }
    int ptr=0;
    for(int i=2;i<=n;i++){
        while(ptr+1<i&&mostright[ptr+1]<=i)ptr++;
        tree.update(0,1,n,1,min(i-1,mostleft[i]-1),1);
        int te=tree.query(0,1,n,1,ptr);
        tree.update(0,1,n,i,i,te);
    }
    printf("%d\n",tree.query(0,1,n,n,n));
    return 0;
}

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 3404 KB Output is correct
2 Correct 3 ms 3404 KB Output is correct
3 Correct 3 ms 3404 KB Output is correct
4 Correct 3 ms 3404 KB Output is correct
5 Correct 3 ms 3404 KB Output is correct
6 Correct 3 ms 3404 KB Output is correct
7 Correct 3 ms 3404 KB Output is correct
8 Correct 3 ms 3404 KB Output is correct
9 Correct 4 ms 3404 KB Output is correct
10 Correct 3 ms 3404 KB Output is correct
11 Correct 3 ms 3456 KB Output is correct

Subtask #2
6.0 / 6.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 3404 KB Output is correct
2 Correct 3 ms 3404 KB Output is correct
3 Correct 3 ms 3404 KB Output is correct
4 Correct 3 ms 3404 KB Output is correct
5 Correct 3 ms 3404 KB Output is correct
6 Correct 3 ms 3404 KB Output is correct
7 Correct 3 ms 3404 KB Output is correct
8 Correct 3 ms 3404 KB Output is correct
9 Correct 4 ms 3404 KB Output is correct
10 Correct 3 ms 3404 KB Output is correct
11 Correct 3 ms 3456 KB Output is correct
12 Correct 3 ms 3404 KB Output is correct
13 Correct 3 ms 3404 KB Output is correct
14 Correct 3 ms 3404 KB Output is correct
15 Correct 3 ms 3404 KB Output is correct
16 Correct 3 ms 3404 KB Output is correct
17 Correct 3 ms 3404 KB Output is correct
18 Correct 3 ms 3404 KB Output is correct
19 Correct 3 ms 3404 KB Output is correct
20 Correct 4 ms 3404 KB Output is correct
21 Correct 3 ms 3404 KB Output is correct
22 Correct 3 ms 3456 KB Output is correct
23 Correct 5 ms 3404 KB Output is correct
24 Correct 6 ms 3420 KB Output is correct
25 Correct 10 ms 3496 KB Output is correct
26 Correct 8 ms 3404 KB Output is correct
27 Correct 8 ms 3404 KB Output is correct
28 Correct 10 ms 3404 KB Output is correct
29 Correct 5 ms 3404 KB Output is correct
30 Correct 13 ms 3500 KB Output is correct
31 Correct 12 ms 3404 KB Output is correct

Subtask #3
14.0 / 14.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 3404 KB Output is correct
2 Correct 3 ms 3404 KB Output is correct
3 Correct 3 ms 3404 KB Output is correct
4 Correct 3 ms 3404 KB Output is correct
5 Correct 3 ms 3404 KB Output is correct
6 Correct 3 ms 3404 KB Output is correct
7 Correct 3 ms 3404 KB Output is correct
8 Correct 3 ms 3404 KB Output is correct
9 Correct 4 ms 3404 KB Output is correct
10 Correct 3 ms 3404 KB Output is correct
11 Correct 3 ms 3456 KB Output is correct
12 Correct 3 ms 3404 KB Output is correct
13 Correct 3 ms 3404 KB Output is correct
14 Correct 3 ms 3404 KB Output is correct
15 Correct 3 ms 3404 KB Output is correct
16 Correct 3 ms 3404 KB Output is correct
17 Correct 3 ms 3404 KB Output is correct
18 Correct 3 ms 3404 KB Output is correct
19 Correct 3 ms 3404 KB Output is correct
20 Correct 4 ms 3404 KB Output is correct
21 Correct 3 ms 3404 KB Output is correct
22 Correct 3 ms 3456 KB Output is correct
23 Correct 5 ms 3404 KB Output is correct
24 Correct 6 ms 3420 KB Output is correct
25 Correct 10 ms 3496 KB Output is correct
26 Correct 8 ms 3404 KB Output is correct
27 Correct 8 ms 3404 KB Output is correct
28 Correct 10 ms 3404 KB Output is correct
29 Correct 5 ms 3404 KB Output is correct
30 Correct 13 ms 3500 KB Output is correct
31 Correct 12 ms 3404 KB Output is correct
32 Correct 178 ms 4212 KB Output is correct
33 Correct 145 ms 4940 KB Output is correct
34 Correct 149 ms 4608 KB Output is correct
35 Correct 204 ms 4904 KB Output is correct
36 Correct 192 ms 4992 KB Output is correct
37 Correct 189 ms 4940 KB Output is correct
38 Correct 141 ms 4704 KB Output is correct
39 Correct 145 ms 4940 KB Output is correct
40 Correct 89 ms 4172 KB Output is correct
41 Correct 154 ms 4676 KB Output is correct
42 Correct 219 ms 4992 KB Output is correct
43 Correct 226 ms 4940 KB Output is correct
44 Correct 3 ms 3404 KB Output is correct
45 Correct 3 ms 3404 KB Output is correct