Submission #1097127

#	Time	Username	Problem	Language	Result	Execution time	Memory
1097127		vjudge1	Miners (IOI07_miners)	C++17	100 / 100	238 ms	756 KiB

miners

#include <bits/stdc++.h>

using namespace std;
using ll = long long;

#define int long long
#define FOR(i, a, b) for (int i = (a); i <= (b); i++)
#define FORD(i, a, b) for (int i = (b); i >= (a); i --)
#define REP(i, a) for (int i = 0; i < (a); ++i)
#define REPD(i, a) for (int i = (a) - 1; i >= 0; --i)

#define MASK(i) (1LL << (i))
#define BIT(x, i) (((x) >> (i)) & 1)


constexpr ll LINF = (1ll << 60);
constexpr int INF = (1ll << 30);
constexpr int Mod = 1e9 + 7;
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());

/*
    Phu Trong from Nguyen Tat Thanh High School for gifted student
*/

template <class X, class Y>
    bool minimize(X &x, const Y &y){
        X eps = 1e-9;
        if (x > y + eps) {x = y; return 1;}
        return 0;
    }

template <class X, class Y>
    bool maximize(X &x, const Y &y){
        X eps = 1e-9;
        if (x + eps < y) {x = y; return 1;}
        return 0;
    }
#define MAX                     100005
int dp[2][4][4][4][4];
//0: not consider yet
//1: fish
//2: meat
//3: bread
int N;
string s;

int conv(char c){
    if(c == 'F') return 1;
    if(c == 'M') return 2;
    if(c == 'B') return 3;
    return 0;
}

int cost(int a, int b, int c){
    if(a * b * c == 0){
        int cnt = 0;
        cnt += (a == 0);
        cnt += (b == 0);
        cnt += (c == 0);
        if(cnt == 1) return (b != c) + 1;
        if(cnt == 2) return 1;
    }
    if(a != b && b != c && c != a) return 3;
    if(a != b || b != c || c != a) return 2;
    return 1;
}

void process(void){
    cin >> N >> s;
    memset(dp, -0x3f, sizeof dp);
    dp[0][0][0][0][0] = 0;
    REP(i, N){
        memset(dp[1], -0x3f, sizeof dp[1]);
        REP(l_semi, 4) REP(l_last, 4) REP(r_semi, 4) REP(r_last, 4){
            int v = conv(s[i]);
            int &ret = dp[0][l_semi][l_last][r_semi][r_last];
            maximize(dp[1][l_last][v][r_semi][r_last], ret + cost(l_semi, l_last, v));
            maximize(dp[1][l_semi][l_last][r_last][v], ret + cost(r_semi, r_last, v));
        }
        swap(dp[0], dp[1]);
    }
    int ans = 0;
    REP(l_semi, 4) REP(l_last, 4) REP(r_semi, 4) REP(r_last, 4){
        maximize(ans, dp[0][l_semi][l_last][r_semi][r_last]);
    }
    cout << ans;
}
signed main(){
    #define name "Whisper"
    cin.tie(nullptr) -> sync_with_stdio(false);
    // freopen(name".inp", "r", stdin);
    // freopen(name".out", "w", stdout);
    process();
    return (0 ^ 0);
}

• Subtask 1: 9 / 9
• Subtask 2: 9 / 9
• Subtask 3: 9 / 9
• Subtask 4: 9 / 9
• Subtask 5: 9 / 9
• Subtask 6: 7 / 7
• Subtask 7: 8 / 8
• Subtask 8: 8 / 8
• Subtask 9: 8 / 8
• Subtask 10: 8 / 8
• Subtask 11: 8 / 8
• Subtask 12: 8 / 8