Submission #685572

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
685572	2023-01-24 14:44:35	MtSaka	Boarding Passes (BOI22_passes)	C++17	100 / 100	193 ms	48796 KiB

passes

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#include<bits/stdc++.h>
using ll=long long;
#define rep(i,a,b) for(ll i=(ll)a;i<(ll)b;++i)
#define rrep(i,a,b) for(ll i=(ll)b-1;i>=(ll)a;--i)
using namespace std;
int main(){
  ios::sync_with_stdio(false);
  cin.tie(0);
  string S;cin>>S;
  vector<int>s;
  for(auto&e:S)s.push_back(e-'A');
  const int n=s.size();
  const int g=*max_element(s.begin(),s.end())+1;
  vector idx(g,vector<int>());
  rep(i,0,n)idx[s[i]].push_back(i);
  vector prefix(g,vector<ll>(n,0));
  auto suffix=prefix;
  vector suml(g,vector<ll>(n,0));
  auto sumr=suml;
  rep(i,0,n){
    prefix[s[i]][i]++;
    suffix[s[i]][i]++;
  }
  rep(i,0,g){
    rep(j,0,n-1)prefix[i][j+1]+=prefix[i][j];
    rrep(j,0,n-1)suffix[i][j]+=suffix[i][j+1];
  }
  vector<int>last(g,-1);
  rep(i,0,n){
    rep(j,0,g)suml[j][i]=prefix[j][i];
 
 
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• Subtask 1: 5 / 5
• Subtask 2: 25 / 25
• Subtask 3: 30 / 30
• Subtask 4: 40 / 40