Submission #775896

#	Time	Username	Problem	Language	Result	Execution time	Memory
775896		gun_gan	Growing Vegetable is Fun 3 (JOI19_ho_t3)	C++17	15 / 100	291 ms	792012 KiB

joi2019_ho_t3

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;

const int MX = 407;

int N;
int dp[MX][MX][MX][3];

vector<int> R, G, Y;

int f(int r, int g, int y, int c) {
      int pos = r + g + y, res = 1e9;
      if(dp[r][g][y][c] != -1) return dp[r][g][y][c];

      if(pos == N) return dp[r][g][y][c] = 0;

      if(c != 0 && r + 1 < R.size()) {
            res = min(res, f(r + 1, g, y, 0) + max(0, R[r + 1] - pos - 1));
      }

      if(c != 1 && g + 1 < G.size()) {
            res = min(res, f(r, g + 1, y, 1) + max(0, G[g + 1] - pos - 1));
      }
      if(c != 2 && y + 1 < Y.size()) {
            res = min(res, f(r, g, y + 1, 2) + max(0, Y[y + 1] - pos - 1));
      }

      return dp[r][g][y][c] = res;     
}

int main() {
      cin.tie(0); ios_base::sync_with_stdio(0);

      memset(dp, -1, sizeof dp);
      
      cin >> N;
      R = {0}, G = {0}, Y = {0};

      for(int i = 1; i <= N; i++) {
            char c;
            cin >> c;

            if(c == 'R') R.push_back(i);
            if(c == 'G') G.push_back(i);
            if(c == 'Y') Y.push_back(i);
      }

      int k = min({f(0, 0, 0, 0), f(0, 0, 0, 1), f(0, 0, 0, 2)});
      if(k == 1e9) k = -1;
      cout << k << '\n';
}

Compilation message (stderr)

joi2019_ho_t3.cpp: In function 'int f(int, int, int, int)':
joi2019_ho_t3.cpp:18:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   18 |       if(c != 0 && r + 1 < R.size()) {
      |                    ~~~~~~^~~~~~~~~~
joi2019_ho_t3.cpp:22:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   22 |       if(c != 1 && g + 1 < G.size()) {
      |                    ~~~~~~^~~~~~~~~~
joi2019_ho_t3.cpp:25:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   25 |       if(c != 2 && y + 1 < Y.size()) {
      |                    ~~~~~~^~~~~~~~~~

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