Submission #1036355

#	Time	Username	Problem	Language	Result	Execution time	Memory
1036355		Andrey	Growing Vegetable is Fun 3 (JOI19_ho_t3)	C++14	100 / 100	340 ms	757564 KiB

joi2019_ho_t3

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

vector<int> wut[3];
int pref[401][3];
int dp[401][401][401][3];

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);
    int n;
    cin >> n;
    string s;
    cin >> s;
    for(int i = 0; i <= n; i++) {
        pref[i][0] = 0;
        pref[i][1] = 0;
        pref[i][2] = 0;
    }
    for(int i = 0; i <= n; i++) {
        for(int j = 0; j <= n; j++) {
            for(int k = 0; k <= n; k++) {
                dp[i][j][k][0] = INT_MAX/2;
                dp[i][j][k][1] = INT_MAX/2;
                dp[i][j][k][2] = INT_MAX/2;
            }
        }
    }
    for(int i = 1; i <= n; i++) {
        int c;
        if(s[i-1] == 'R') {
            c = 0;
        }
        else if(s[i-1] == 'G') {
            c = 1;
        }
        else {
            c = 2;
        }
        pref[i][c]++;
        wut[c].push_back(i);
    }
    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];
    }
    dp[0][0][0][0] = 0;
    dp[0][0][0][1] = 0;
    dp[0][0][0][2] = 0;
    int ans = INT_MAX;
    for(int i = 0; i <= n; i++) {
        for(int j = 0; j <= n; j++) {
            for(int k = 0; k <= n; k++) {
                if(i+j+k == 0 || i+j+k > n) {
                    continue;
                }
                if(i > wut[0].size() || j > wut[1].size() || k > wut[2].size()) {
                    continue;
                }
                dp[i][j][k][0] = INT_MAX/2;
                dp[i][j][k][1] = INT_MAX/2;
                dp[i][j][k][2] = INT_MAX/2;
                int y = i+j+k;
                if(i > 0) {
                    int p = wut[0][i-1];
                    int c = p;
                    p+=max(0,j-pref[c][1]);
                    p+=max(0,k-pref[c][2]);
                    dp[i][j][k][0] = min(dp[i][j][k][0],dp[i-1][j][k][1]+p-y);
                    dp[i][j][k][0] = min(dp[i][j][k][0],dp[i-1][j][k][2]+p-y);
                }
                if(j > 0) {
                    int p = wut[1][j-1];
                    int c = p;
                    p+=max(0,i-pref[c][0]);
                    p+=max(0,k-pref[c][2]);
                    dp[i][j][k][1] = min(dp[i][j][k][1],dp[i][j-1][k][0]+p-y);
                    dp[i][j][k][1] = min(dp[i][j][k][1],dp[i][j-1][k][2]+p-y);
                }
                if(k > 0) {
                    int p = wut[2][k-1];
                    int c = p;
                    p+=max(0,i-pref[c][0]);
                    p+=max(0,j-pref[c][1]);
                    dp[i][j][k][2] = min(dp[i][j][k][2],dp[i][j][k-1][0]+p-y);
                    dp[i][j][k][2] = min(dp[i][j][k][2],dp[i][j][k-1][1]+p-y);
                }
                if(i+j+k == n) {
                    ans = min(ans,dp[i][j][k][0]);
                    ans = min(ans,dp[i][j][k][1]);
                    ans = min(ans,dp[i][j][k][2]);
                }
            }
        }
    }
    if(ans > n*n) {
        cout << -1;
    }
    else {
        cout << ans;
    }
    return 0;
}

Compilation message (stderr)

joi2019_ho_t3.cpp: In function 'int main()':
joi2019_ho_t3.cpp:60:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   60 |                 if(i > wut[0].size() || j > wut[1].size() || k > wut[2].size()) {
      |                    ~~^~~~~~~~~~~~~~~
joi2019_ho_t3.cpp:60:43: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   60 |                 if(i > wut[0].size() || j > wut[1].size() || k > wut[2].size()) {
      |                                         ~~^~~~~~~~~~~~~~~
joi2019_ho_t3.cpp:60:64: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   60 |                 if(i > wut[0].size() || j > wut[1].size() || k > wut[2].size()) {
      |                                                              ~~^~~~~~~~~~~~~~~

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