Submission #1261317

#	Time	Username	Problem	Language	Result	Execution time	Memory
1261317		goulthen	Growing Vegetable is Fun 3 (JOI19_ho_t3)	C++20	100 / 100	131 ms	164932 KiB

joi2019_ho_t3

//#pragma GCC optimize("O3")
//#pragma GCC optimize("unroll-loops")
#include <bits/stdc++.h>
using namespace std;
#include <ext/pb_ds/assoc_container.hpp>
using namespace __gnu_pbds;
template <class T>
using Tree =
    tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
 
#define int long long
#define ll long long
#define pii pair<int, int>
#define pll pair<ll, ll>
#define fi first
#define se second
#define rep(i, a, b) for (int i = a; i <= b; ++i)
#define per(i, b, a) for (int i = b; i >= a; --i)
#define pb push_back
#define eb emplace_back
#define all(v) (v).begin(), (v).end()
#define lsb(x) (x)&(-x)
#define bug(x) cerr << #x << " " << x << endl;
 
void setIO(string name = "") {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr); cout.tie(nullptr);
    if (!name.empty()) {
        freopen((name + ".in").c_str(), "r", stdin);
        freopen((name + ".out").c_str(), "w", stdout);
    }
}
 
ll fexp(ll a, ll b, ll m) {
    if (b == 0) return 1LL;
    ll p = a;
    ll ans = 1;
    while (b > 0) {
        if (b % 2 != 0) ans = (ans * p) % m;
        p = (p * p) % m;
        b >>= 1;
    }
    return ans;
}
 
const int MAXN = 4e2 + 10;
const int INF = 1e18 + 5;
const int MOD = 1e9 + 7;
int dp[MAXN][MAXN][MAXN][3], cnt[MAXN][3], a[MAXN], p[MAXN][3];

void solve() {
    int n;cin >> n;
    rep(i,1,n) {
        char ch;cin >> ch;
        if (ch=='R') a[i] = 0;
        else if (ch == 'G')a[i] = 1;
        else a[i] = 2;
    }
    rep(i,1,n) rep(j,0,2) cnt[i][j] = cnt[i-1][j] + (a[i]==j);
    int c[3] = {};
    rep(i,1,n) p[++c[a[i]]][a[i]] = i;
    
    rep(x,0,cnt[n][0]) {
        rep(y,0,cnt[n][1]) {
            rep(z,0,cnt[n][2]) {
                rep(i,0,2) dp[x][y][z][i] = INF;
            }
        }
    }
    rep(i,0,2) dp[0][0][0][i] = 0;

    rep(x,0,cnt[n][0]) {
        rep(y,0,cnt[n][1]) {
            rep(z,0,cnt[n][2]) {
                vector<int> t = {x,y,z};
                rep(i,0,2) {
                    if (t[i]==0) continue;
                    int j = (i+1)%3, k = (i+2)%3, pos = p[t[i]][i];
                    int inv = max(0LL,cnt[pos][j]-t[j]) + max(0LL,cnt[pos][k]-t[k]);
                    rep(l,0,2) {
                        if (i==l) continue;
                        dp[x][y][z][i] = min(dp[x][y][z][i], dp[x-(i==0)][y-(i==1)][z-(i==2)][l] + inv);
                    }
                }
            }
        }
    }
    int ans = INF;
    rep(i,0,2) ans = min(ans, dp[cnt[n][0]][cnt[n][1]][cnt[n][2]][i]);
    cout << (ans==INF?-1:ans) << '\n';
}

int32_t main() {
    setIO();
    int tt = 1;
    //cin >> tt;
 
    while (tt-- > 0) solve();
    return 0;
}

Compilation message (stderr)

joi2019_ho_t3.cpp: In function 'void setIO(std::string)':
joi2019_ho_t3.cpp:29:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   29 |         freopen((name + ".in").c_str(), "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
joi2019_ho_t3.cpp:30:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   30 |         freopen((name + ".out").c_str(), "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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