Submission #1269174

#	Time	Username	Problem	Language	Result	Execution time	Memory
1269174		i_lov_aris	Exercise Deadlines (CCO20_day1problem2)	C++20	25 / 25	109 ms	18636 KiB

Main

#include<bits/stdc++.h>
/*
    --> Programmed by katamori1310 <--
                ᓀ‸ᓂ
    Chillin with Blue Archive
*/
#define int long long
#define ull unsigned long long
#define fi first
#define se second
#define aris ""
using namespace std;
const int MAXN = 100000;
const int MOD = 1e9 + 7;
const int MAXP = 1e6;
const int INF = 1e18;
const int MODE = MOD - 2;

/* 
    I love Aris and Kei at the same time
        ☆ ☆ ☆ Pampakapam ☆ ☆ ☆
*/
inline void kei(){
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);
}
int n;
int a[2 * MAXN + 5];
int pos[2 * MAXN + 5];
int st[8 * MAXN + 5];
vector<int>d[2 * MAXN + 5];
priority_queue<int>pq;
void update(int id, int l, int r, int i, int val){
    if(l > i || r < i) return;
    if(l == r){
        st[id] = val;
        return;
    }
    int mid = (l + r) / 2;
    if(i <= mid) update(2 * id, l, mid, i, val);
    else update(2 * id + 1, mid + 1, r, i, val);
    st[id] = st[2 * id] + st[2 * id + 1];
}
int query(int id, int l, int r, int u, int v){
    if(l > v || r < u) return 0;
    if(l >= u && r <= v) return st[id];
    int mid = (l + r) / 2;
    int query1 = query(2 * id, l, mid, u, v);
    int query2 = query(2 * id + 1, mid + 1, r, u, v);
    return query1 + query2;
}
void solve(){
    cin >> n;
    for(int i = 1; i <= n; i++){
        cin >> a[i];
        d[a[i]].push_back(i);
    }
    for(int i = n; i >= 1; i--){
        for(auto it : d[i]){
            pq.push(it);
        }
        if(pq.empty()){
            cout << -1 << "\n";
            return;
        }
        pos[i] = pq.top();
        pq.pop();
    }
    int res = 0;
    for(int i = 1; i <= n; i++){
        res += i - query(1, 1, n, 1, pos[i]) - 1;
        update(1, 1, n, pos[i], 1);
    }
    cout << res << "\n";
}
signed main(){
    if(fopen(aris".inp", "r")){
        freopen(aris".inp", "r", stdin);
        freopen(aris".out", "w", stdout);
    }
    kei();
    int T;
    // cin >> T;
    T = 1;
    while(T--){
        solve();
    }
    return 0;
}

// 눈‸눈 

Compilation message (stderr)

Main.cpp: In function 'int main()':
Main.cpp:79:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   79 |         freopen(aris".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:80:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   80 |         freopen(aris".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 17 / 17
• Subtask 2: 8 / 8