Submission #883193

#	Time	Username	Problem	Language	Result	Execution time	Memory
883193		mychecksedad	Growing Vegetable is Fun 3 (JOI19_ho_t3)	C++17	15 / 100	352 ms	774224 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];
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);
  }
  // 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] = 2*MOD;
  dp[0][0][0][0] = 0;
  dp[0][0][0][1] = 0;
  dp[0][0][0][2] = 0;

  for(int i = 1; i <= n; ++i){
    // cout << i << ":\n";
    for(int j = 0; j <= min(i, x[0]); ++j){
      for(int l = 0; l <= min(i - j, x[1]); ++l){
        // cout << j << ' ' << l << ':';
        // cout << j << ' ' << l << endl;
        for(int x1 = 0; x1 < 3; ++x1){
          // cout << x1 << "x1" << endl;
          for(int x2 = 0; x2 < 3; ++x2){
            if(x1==x2) continue;
            // cout << x1 << ' ' << x2 << " | ";
            array<int, 3> y = {j, l, i-j-l};
            if(y[x1] > x[x1]) continue;
            if(x1 == 0) y[0]--;
            if(x1 == 1) y[1]--;
            if(x1 == 2) y[2]--;
            if(min({y[0], y[1], y[2]}) < 0) continue;
            int cost = v[x1][y[x1]];
            // cout << "hm " << endl;
            dp[i][j][l][x1] = min(dp[i][j][l][x1], dp[i - 1][y[0]][y[1]][x2] + abs(cost - (i-1)));
          }
        }
        // en;
      }
    }
  }
  cout << min({dp[n][x[0]][x[1]][0], dp[n][x[0]][x[1]][1], dp[n][x[0]][x[1]][2]}) /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:74:15: warning: unused variable 'aa' [-Wunused-variable]
   74 |   int tt = 1, aa;
      |               ^~

• Subtask 1: 0 / 5
• Subtask 2: 0 / 55
• Subtask 3: 15 / 15
• Subtask 4: 0 / 25