Submission #570203

#TimeUsernameProblemLanguageResultExecution timeMemory
570203KingJtMountains (NOI20_mountains)C++17
66 / 100
384 ms4988 KiB
#include <bits/stdc++.h> using namespace std; #define F first #define S second #define pb push_back #define lb lower_bound #define ub upper_bound #define bn binary_search #define sz(x) int((x).size()) #define lz(x) long long((x).size()) #define INF 1000000007 typedef long long ll; typedef vector<int> vi; typedef pair<int,int> ii; typedef vector<ll> vl; typedef pair<ll,ll> il; typedef vector<ii> vii; typedef vector<il> vil; typedef vector<vi> vvi; typedef vector<vl> vvl; typedef vector<string> vs; typedef vector<char> vc; typedef vector<bool> vb; typedef vector<pair<int,ii>> gw; typedef vector<pair<ll,il>> lw; typedef vector<vc> vvc; void solve(){ ll n; cin>>n; vl in(n); bool ban1=true,ban2=true; for(ll i=0;i<n;i++){ cin>>in[i]; if(i>0){ if(in[i]<in[i-1]) ban1=false; } if(in[i]!=0&&in[i]!=1) ban2=false; } if(ban1){ cout<<0<<endl; return; } if(ban2){ vi a(n,0); for(int i=1;i<n-1;i++){ if(!in[i-1]){ a[i]=a[i-1]+1; }else a[i]=a[i-1]; } vi b(n,0); for(int i=n-2;i>=1;i--){ if(!in[i+1]) b[i]=b[i+1]+1; else b[i]=b[i+1]; } /*for(int i=0;i<n;i++){ cout<<a[i]<<" "; } cout<<endl; for(int i=0;i<n;i++){ cout<<b[i]<<" "; }*/ ll ans=0; for(int i=0;i<n;i++){ if(in[i]){ ans+=a[i]*b[i]; } } cout<<ans<<endl; return; } ll ans=0; for(ll i=1;i<n-1;i++){ ll left=0,right=0; for(ll j=0;j<n;j++){ if(j<i&&in[i]>in[j]){ left++; }else if(j>i&&in[i]>in[j]) right++; } ans+=left*right; } cout<<ans<<endl; } int main(){ ios_base::sync_with_stdio(false), cin.tie(0), cout.tie(0); solve(); return 0; }
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