Submission #155675

#	Time	Username	Problem	Language	Result	Execution time	Memory
155675		popovicirobert	Growing Vegetable is Fun 3 (JOI19_ho_t3)	C++14	100 / 100	157 ms	99420 KiB

joi2019_ho_t3

#include <bits/stdc++.h>
#define lsb(x) (x & (-x))
#define ll long long
#define ull unsigned long long



#if 0
const int MOD = ;

inline int lgput(int a, int b) {
    int ans = 1;
    while(b > 0) {
        if(b & 1) ans = (1LL * ans * a) % MOD;
        b >>= 1;
        a = (1LL * a * a) % MOD;
    }
    return ans;
}

inline void mod(int &x) {
    if(x >= MOD)
        x -= MOD;
}

inline void add(int &x, int y) {
    x += y;
    mod(x);
}

inline void sub(int &x, int y) {
    x += MOD - y;
    mod(x);
}

inline void mul(int &x, int y) {
    x = (1LL * x * y) % MOD;
}

inline int inv(int x) {
    return lgput(x, MOD - 2);
}
#endif

#if 0
int fact[], invfact[];

inline void prec(int n) {
    fact[0] = 1;
    for(int i = 1; i <= n; i++) {
        fact[i] = (1LL * fact[i - 1] * i) % MOD;
    }
    invfact[n] = lgput(fact[n], MOD - 2);
    for(int i = n - 1; i >= 0; i--) {
        invfact[i] = (1LL * invfact[i + 1] * (i + 1)) % MOD;
    }
}

inline int comb(int n, int k) {
    if(n < k) return 0;
    return (1LL * fact[n] * (1LL * invfact[k] * invfact[n - k] % MOD)) % MOD;
}
#endif

using namespace std;

const int INF = 1e9;
const int MAXN = 400;

int dp[MAXN + 1][MAXN + 1][MAXN + 1][3];
int num[3][3][MAXN + 1][MAXN + 1];

int main() {
#if 0
    ifstream cin("A.in");
    ofstream cout("A.out");
#endif
    int i, j, n;
    ios::sync_with_stdio(false);
    cin.tie(0), cout.tie(0);

    string str;
    cin >> n >> str;
    str = " " + str;

    vector <int> ind('Z'), fr(3), pos[3];
    ind['R'] = 0, ind['Y'] = 1, ind['G'] = 2;

    for(i = 1; i <= n; i++) {
        str[i] = ind[str[i]];
        fr[str[i]]++;
    }
    for(i = 0; i < 3; i++) {
        pos[i].push_back(0);
    }
    for(i = 1; i <= n; i++) {
        pos[str[i]].push_back(i);
    }

    for(int a = 0; a < 3; a++) {
        for(int b = 0; b < 3; b++) {
            for(i = 0; i <= fr[a]; i++) {
                int cnt = 0;
                for(j = 0; j <= fr[b]; j++) {
                    if(pos[a][i] < pos[b][j]) {
                        cnt++;
                    }
                    num[a][b][i][j] = cnt;
                }
            }
        }
    }


    for(int a = 0; a <= fr[0]; a++) {
        for(int b = 0; b <= fr[1]; b++) {
            for(int c = 0; c <= fr[2]; c++) {
                for(i = 0; i < 3; i++) {
                    dp[a][b][c][i] = INF;
                }
            }
        }
    }
    for(i = 0; i < 3; i++) {
        dp[0][0][0][i] = 0;
    }


    for(int a = 0; a <= fr[0]; a++) {
        for(int b = 0; b <= fr[1]; b++) {
            for(int c = 0; c <= fr[2]; c++) {
                int p = a + b + c;
                if(p == 0) continue;

                for(int d = 0; d < 3; d++) {
                    for(int e = 0; e < 3; e++) {
                        if(d == e) continue;

                        int cur;
                        if(d == 0) {
                            if(a == 0) continue;
                            cur = dp[a - 1][b][c][e] + (pos[0][a] + num[0][1][a][b] + num[0][2][a][c]) - p;
                        }
                        if(d == 1) {
                            if(b == 0) continue;
                            cur = dp[a][b - 1][c][e] + (pos[1][b] + num[1][0][b][a] + num[1][2][b][c]) - p;
                        }
                        if(d == 2) {
                            if(c == 0) continue;
                            cur = dp[a][b][c - 1][e] + (pos[2][c] + num[2][0][c][a] + num[2][1][c][b]) - p;
                        }
                        dp[a][b][c][d] = min(dp[a][b][c][d], cur);
                    }
                }
            }
        }
    }

    int ans = INF;
    for(i = 0; i < 3; i++) {
        ans = min(ans, dp[fr[0]][fr[1]][fr[2]][i]);
    }
    if(ans == INF) {
        ans = -1;
    }
    cout << ans;

    return 0;
}

Compilation message (stderr)

joi2019_ho_t3.cpp: In function 'int main()':
joi2019_ho_t3.cpp:97:19: warning: array subscript has type 'char' [-Wchar-subscripts]
         pos[str[i]].push_back(i);
                   ^
joi2019_ho_t3.cpp:139:29: warning: 'cur' may be used uninitialized in this function [-Wmaybe-uninitialized]
                         int cur;
                             ^~~

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