Submission #920139

#	Time	Username	Problem	Language	Result	Execution time	Memory
920139		vjudge1	Growing Vegetable is Fun 3 (JOI19_ho_t3)	C++17	100 / 100	345 ms	769816 KiB

joi2019_ho_t3

/* Author : Mychecksdead  */
#include<bits/stdc++.h>
using namespace std;
#define ll long long int
#define MOD (1000000000+7)
#define MOD1 (998244353)
#define pb push_back
#define all(x) x.begin(), x.end()
#define en cout << '\n'
const int N = 405, M = 1e5+10, K = 52, MX = 30;
 
 
int n, dp[N][N][N][3], pref[N][3];
string s, c = "RGY";
int m(char x){
  if(x==c[0]) return 0;
  if(x==c[1]) return 1;
  return 2;
}
void solve(){
  cin >> n >> s;
  array<int, 3> x = {0, 0, 0};
  for(int i = 0 ;i < n; ++i){
    x[m(s[i])]++;
  }
  if(max({x[0], x[1], x[2]}) > (n+1)/2){
    cout << -1;
    return;
  }
  vector<int> v[3];
  for(int i = 0; i < n; ++i){
    v[m(s[i])].pb(i + 1);
  }
  // for(auto x: v[0]) cout << x << ' '; en;
  // for(auto x: v[1]) cout << x << ' '; en;
  // for(auto x: v[2]) cout << x << ' '; en;
  for(int i = 0; i <= n; ++i) for(int j = 0; j <= n; ++j) for(int l = 0; l <= n; ++l) dp[i][j][l][0] = dp[i][j][l][1] = dp[i][j][l][2] = MOD;
  dp[0][0][0][0] = 0;
  dp[0][0][0][1] = 0;
  dp[0][0][0][2] = 0;
 
  pref[0][0] = pref[0][1] = pref[0][2] = 0;
  for(int i = 1; i <= n; ++i){
    pref[i][0] = pref[i - 1][0];
    pref[i][1] = pref[i - 1][1];
    pref[i][2] = pref[i - 1][2];
    pref[i][m(s[i-1])]++;
  }
 
  for(int i = 1; i <= n; ++i){
    for(int j = 0; j <= min(i, x[0]); ++j){
      for(int l = 0; l <= min(i - j, x[1]); ++l){
        for(int x1 = 0; x1 < 3; ++x1){
          array<int, 3> y = {j, l, i-j-l};
          if(y[0] > x[0]) continue;
          if(y[1] > x[1]) continue;
          if(y[2] > x[2]) continue;
           
          if(y[x1] == 0) continue;
 
          int cost = v[x1][y[x1] - 1];
 
          int add = 0;
          for(int t = 0; t < 3; ++t){
            add += min(pref[cost - 1][t], y[t] - (t == x1));
          }
          cost += i - add - 1;
 
          if(x1 == 0) y[0]--;
          if(x1 == 1) y[1]--;
          if(x1 == 2) y[2]--;
 
          for(int x2 = 0; x2 < 3; ++x2){
            if(x1==x2) continue;
            dp[i][j][l][x1] = min(dp[i][j][l][x1], dp[i - 1][y[0]][y[1]][x2] + cost - i);
          }
        }
        // en;
      }
    }
  }
  cout << min({dp[n][x[0]][x[1]][0], dp[n][x[0]][x[1]][1], dp[n][x[0]][x[1]][2]});
}
 
 
int main(){
  cin.tie(0); ios::sync_with_stdio(0);
  int tt = 1, aa;
  // freopen("in.txt", "r", stdin);
  // freopen("out.txt", "w", stdout);
  while(tt--){
    solve();
    en;
  }
  cerr<<"time taken : "<<(float)clock()/CLOCKS_PER_SEC<<" seconds\n";
  return 0;
} 

Compilation message (stderr)

joi2019_ho_t3.cpp: In function 'int main()':
joi2019_ho_t3.cpp:88:15: warning: unused variable 'aa' [-Wunused-variable]
   88 |   int tt = 1, aa;
      |               ^~

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