Submission #914398

#	Time	Username	Problem	Language	Result	Execution time	Memory
914398		Keys	Growing Vegetable is Fun 3 (JOI19_ho_t3)	C++14	100 / 100	355 ms	57328 KiB

joi2019_ho_t3

#include <bits/stdc++.h>
using namespace std;
#define int long long
using vi = vector<int>;
#define pb push_back
#define all(x) x.begin(), x.end()
#define f first
#define s second
#define endl '\n'
#define FOR(i, a, b) for (int i = (a); i < (b); i++)
template <class T> istream &operator>>(istream& in, vector<T> &v) {for (auto& i : v) in >> i; return in;}
 
#ifdef LOCAL
#include "../../../lib/debug.h"
#else
#define dbg(...)
#endif
 
const int N=405,oo=1e18;
int trans[3][N][3];
int cnt[3];
map<char,int>m;
 
void ckmin(int&a,int b) {a=min(a,b);}
 
signed main() {
  ios::sync_with_stdio(0);cin.tie(0);m['R']=0;m['G']=1;m['Y']=2;
  int n;cin>>n;string s;cin>>s;
  FOR(i,0,n)cnt[m[s[i]]]++;
  vi y={0,0,0};
  FOR(i,0,n){
    y[m[s[i]]]++;
    FOR(j,0,3)trans[m[s[i]]][y[m[s[i]]]][j]=y[j];
  }
  int dp[cnt[0]+1][cnt[1]+1][cnt[2]+1][3];FOR(i,0,cnt[0]+1)FOR(j,0,cnt[1]+1)FOR(k,0,cnt[2]+1)FOR(l,0,3)dp[i][j][k][l]=oo;FOR(i,0,3)dp[0][0][0][i]=1;

  FOR(i,0,cnt[0]+1)FOR(j,0,cnt[1]+1)FOR(k,0,cnt[2]+1)FOR(last,0,3)FOR(next,0,3)if(last!=next){
    vi x={i,j,k};if(x[next]==cnt[next])continue;
    int nxt=dp[i][j][k][last];
    x[next]++;
    FOR(p,0,3)nxt+=max(0ll,trans[next][x[next]][p]-x[p]);
    ckmin(dp[x[0]][x[1]][x[2]][next],nxt);
  }
  int ans=min({dp[cnt[0]][cnt[1]][cnt[2]][0], dp[cnt[0]][cnt[1]][cnt[2]][1], dp[cnt[0]][cnt[1]][cnt[2]][2]});
  if(ans==oo)cout<<-1<<endl;
  else cout<<ans-1<<endl;
}

• Subtask 1: 5 / 5
• Subtask 2: 55 / 55
• Subtask 3: 15 / 15
• Subtask 4: 25 / 25