제출 #813534

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
813534		ZeroCool	Exam (eJOI20_exam)	C++14	12 / 100	60 ms	4524 KiB

exam

#include <bits/stdc++.h>  
#define INF 1e18
#define LL long long
#define int long long
using namespace std;
      
const int mod = 1e9 + 7;
const int inf = 1e18;
const int mxn = 1e5 +5;

int n;

int A[mxn];
int B[mxn];
int l[mxn];
int r[mxn];
 
void two_pointers(){
    int x = B[0];
    int res = 0;
    for(int i = 0;i<n;i++) {
        if(A[i] == x) {
            res++;
            int j = i - 1;
            while(j >= 0 && A[j] <= x) {
                j--;
                res++;
            }
            j = i + 1;
            while(j < n && A[j] <= x) {
                res++;
                j++;
            }
            i = j - 1;
        }
    }
    cout<<res<<endl;
}

void solve(){
    cin>>n;

    set<int>s;
    int c[n+5];
    for(int i = 0;i<n;i++)cin>>A[i];
    for(int i = 0;i<n;i++){
        cin>>B[i];
        s.insert(B[i]);
    }

    for(int i = 0;i<n;i++)c[i+1] = A[i];

    c[0] = inf;
    c[n+1] = inf;
    stack<int> st;
    st.push(0);
    for(int i = 1;i<=n;i++){
        while(st.size() && (c[st.top()] <= c[i]))st.pop();
        l[i-1] = st.top() - 1;
        st.push(i);
    } 
    //st = stack<int>();
    while(st.size())st.pop();
    st.push(n+1);
    for(int i = n;i;i--){
        while(st.size() && (c[st.top()] <= c[i]))st.pop();
        //cout<<"tukaa"<<endl;
        r[i-1] = st.top() - 1;
        if(r[i-1] >= n)r[i-1] = -1; 
        st.push(i);
    } 
    bool sub2 = true;
    for(int i = 1;i<n;i++){
        if(B[i] != B[0]){
            sub2 = false;
            break;
        }
    }

    if(sub2){
        two_pointers();
        return;
    }
}

int32_t main() {  
    #ifdef ONLINE_JUDGE
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    #endif
    solve();
}   

• Subtask 1: 0 / 14
• Subtask 2: 12 / 12
• Subtask 3: 0 / 13
• Subtask 4: 0 / 23
• Subtask 5: 0 / 16
• Subtask 6: 0 / 22