Submission #1104863

#	Time	Username	Problem	Language	Result	Execution time	Memory
1104863		ro9669	Airplane (NOI23_airplane)	C++17	22 / 100	56 ms	18848 KiB

Main

#include <bits/stdc++.h>
#define fi first
#define se second
#define all(v) v.begin() , v.end()
#define sz(v) int(v.size())
#define unq(v) sort(all(v)); v.resize(unique(all(v)) - v.begin());
using namespace std;

typedef long long ll;
typedef pair<int , int> ii;
typedef pair<long long , int> lli;

const int maxN = int(2e5)+7;
const int maxM = int(4e5)+7;

int n , m , a[maxN];
ii E[maxM];
vector<int> g[maxN];

namespace sub1{
    bool check(){
        if (m != n - 1) return 0;
        for (int i = 1 ; i <= m ; i++){
            if (E[i].fi != i || E[i].se != i + 1) return 0;
        }
        return 1;
    }

    void solve(){
        int p = -1;
        for (int i = 1 ; i <= n ; i++){
            if (p == -1 || a[p] < a[i]) p = i;
        }
        ll ans = 0;
        int pre = 0 , suf = 0;
        for (int i = 2 ; i <= p ; i++){
            if (pre == a[p]){
                ans++;
            }
            else{
                ans += 1ll * max(a[i] - pre , 1);
                pre = max(pre + 1 , a[i]);
            }
        }
        for (int i = n - 1 ; i >= p ; i--){
            if (suf == a[p]){
                ans++;
            }
            else{
                ans += 1ll * max(a[i] - suf , 1);
                suf = max(suf + 1 , a[i]);
            }
        }
        cout << ans << "\n";
    }
}

void solve(){
    cin >> n >> m;
    for (int i = 1 ; i <= n ; i++) cin >> a[i];
    for (int i = 1 ; i <= m ; i++){
        int u , v;
        cin >> u >> v;
        E[i] = {u , v};
        g[u].push_back(v);
        g[v].push_back(u);
    }
    if (sub1::check()) return sub1::solve();
}

#define name "A"

int main(){
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    if (fopen(name".INP" , "r")){
        freopen(name".INP" , "r" , stdin);
        freopen(name".OUT" , "w" , stdout);
    }
    int t = 1; //cin >> t;
    while (t--) solve();
    return 0;
}

Compilation message (stderr)

Main.cpp: In function 'int main()':
Main.cpp:76:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   76 |         freopen(name".INP" , "r" , stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:77:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   77 |         freopen(name".OUT" , "w" , stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 22 / 22
• Subtask 2: 0 / 10
• Subtask 3: 0 / 31
• Subtask 4: 0 / 37