Submission #97525

#	Time	Username	Problem	Language	Result	Execution time	Memory
97525		dalgerok	Growing Vegetable is Fun 3 (JOI19_ho_t3)	C++14	100 / 100	97 ms	28860 KiB

joi2019_ho_t3

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



const int N = 405;


int n, cnt[N][3], pos[N][3];
char a[N];

inline void upd(int &x, int y){
    if(x > y){
        x = y;
    }
}

int main(){
    ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
    cin >> n;
    for(int i = 1; i <= n; i++){
        char c;
        cin >> c;
        if(c == 'R'){
            a[i] = 0;
        }
        else if(c =='G'){
            a[i] = 1;
        }
        else{
            a[i] = 2;
        }
        for(int j = 0; j < 3; j++){
            cnt[i][j] = cnt[i - 1][j];
        }
        cnt[i][a[i]] += 1;
        pos[cnt[i][a[i]]][a[i]] = i;
    }
    int dp[cnt[n][0] + 1][cnt[n][1] + 1][cnt[n][2] + 1][3];
    memset(dp, 63, sizeof(dp));
    dp[0][0][0][0] = dp[0][0][0][1] = dp[0][0][0][2] = 0;
    for(int i = 0; i <= cnt[n][0]; i++){
        for(int j = 0; j <= cnt[n][1]; j++){
            for(int k = 0; k <= cnt[n][2]; k++){
                for(int d = 0; d < 3; d++){
                    int p;
                    if(d != 0 && i + 1 <= cnt[n][0]){
                        p = pos[i + 1][0];
                        upd(dp[i + 1][j][k][0], dp[i][j][k][d] + max(0, cnt[p][1] - j) + max(0, cnt[p][2] - k));
                    }
                    if(d != 1 && j + 1 <= cnt[n][1]){
                        p = pos[j + 1][1];
                        upd(dp[i][j + 1][k][1], dp[i][j][k][d] + max(0, cnt[p][0] - i) + max(0, cnt[p][2] - k));
                    }
                    if(d != 2 && k + 1 <= cnt[n][2]){
                        p = pos[k + 1][2];
                        upd(dp[i][j][k + 1][2], dp[i][j][k][d] + max(0, cnt[p][0] - i) + max(0, cnt[p][1] - j));
                    }
                }
            }
        }
    }
    int ans = 2e9;
    for(int i = 0; i < 3; i++){
        upd(ans, dp[cnt[n][0]][cnt[n][1]][cnt[n][2]][i]);
    }
    if(ans > 1e7){
        return cout << "-1", 0;
    }
    cout << ans;
}

Compilation message (stderr)

joi2019_ho_t3.cpp: In function 'int main()':
joi2019_ho_t3.cpp:36:20: warning: array subscript has type 'char' [-Wchar-subscripts]
         cnt[i][a[i]] += 1;
                    ^
joi2019_ho_t3.cpp:37:24: warning: array subscript has type 'char' [-Wchar-subscripts]
         pos[cnt[i][a[i]]][a[i]] = i;
                        ^
joi2019_ho_t3.cpp:37:31: warning: array subscript has type 'char' [-Wchar-subscripts]
         pos[cnt[i][a[i]]][a[i]] = i;
                               ^

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