#892449 (C++17(gcc12)) No.5017 Tool-assisted Shooting

• 問題: No.5017 Tool-assisted Shooting
• ユーザー: 👑 wanui
• 提出日時: 2023-07-16 18:58:49
• 言語: C++17(gcc12) (gcc 12.3.0 + boost 1.87.0)
• 結果: AC
• 実行時間: 726 ms / 2,000 ms
• コード長: 9,051 bytes
• コンパイル時間: 2,717 ms
• コンパイル使用メモリ: 207,860 KB
• 実行使用メモリ: 24,372 KB
• スコア: 4,393,968
• 平均クエリ数: 1000.00
• 最終ジャッジ日時: 2023-07-16 19:01:48
• 合計ジャッジ時間: 75,884 ms
• ジャッジサーバーID （参考情報）: judge11 / judge16

ファイルパターン	結果
other	AC * 100

ソースコード

#include <bits/stdc++.h>
const int LOCAL = 0;

// clang-format off
using namespace std; using ll=long long; using ull=unsigned long long; using pll=pair<ll,ll>; const ll INF=4e18;
#define debug1(a) { cerr<<#a<<":"<<a<<endl; }
#define debug2(a,b) { cerr<<#a<<":"<<a<<" "<<#b<<":"<<b<<endl; }
#define debug3(a,b,c) { cerr<<#a<<":"<<a<<" "<<#b<<":"<<b<<" "<<#c<<":"<<c<<endl; }
#define debug4(a,b,c,d) { cerr<<#a<<":"<<a<<" "<<#b<<":"<<b<<" "<<#c<<":"<<c<<" "<<#d<<":"<<d<<endl; }

struct point {int r; int c; };
bool operator==(const point &lhs, const point &rhs) { return (lhs.r == rhs.r && lhs.c == rhs.c); }
bool operator!=(const point &lhs, const point &rhs) { return !(lhs == rhs); }
bool operator<(const point &lhs, const point &rhs) {
    if (lhs.r != rhs.r){return lhs.r<rhs.r;}
    return lhs.c<rhs.c;
}
point operator-(const point &self){
    return {-self.r, -self.c};
}
point operator+(const point &lhs, const point &rhs){
    return {lhs.r+rhs.r, lhs.c+rhs.c};
}
point operator-(const point &lhs, const point &rhs){
    return lhs + (-rhs);
}
std::ostream &operator<<(std::ostream &os, point &pt) {
    string s;
    s = "(" + to_string(int(pt.r)) + ", " + to_string(int(pt.c)) + ")";
    return os << s;
};

// clang-format on
namespace marathon {
mt19937 engine(0);
clock_t start_time;
double now() {
    return 1000.0 * (clock() - start_time) / CLOCKS_PER_SEC;
}
void marathon_init() {
    start_time = clock();
    random_device seed_gen;
    engine.seed(seed_gen());
}
int randint(int mn, int mx) {
    int rng = mx - mn + 1;
    return mn + (engine() % rng);
}
double uniform(double x, double y) {
    const int RND = 1e8;
    double mean = (x + y) / 2.0;
    double dif = y - mean;
    double p = double(engine() % RND) / RND;
    return mean + dif * (1.0 - 2.0 * p);
}
}  // namespace marathon

const int INIT_MY_C = 12;
const int H = 60;
const int W = 25;

struct enemy_t {
    int init_hp;
    int hp;
    int power;
};
struct state_t {
    enemy_t board[H][W];
    int total_power;
    int total_hp;
    int my_c;
    int turn;

    int level() {
        return 1 + total_power / 100;
    }
};
void read_enemies(state_t &state) {
    int n;
    cin >> n;
    for (int it = 0; it < n; it++) {
        int h, p, x;
        cin >> h >> p >> x;
        enemy_t e;
        e.hp = h;
        e.init_hp = h;
        e.power = p;
        state.board[H - 1][x] = e;
    }
}
void generate_enemies(state_t &state) {
    return;
    double mean = 7.5 + 0.15 * state.turn;
    double sd = 1.5 + 0.03 * state.turn;
    normal_distribution<> dist(mean, sd);
    for (int c = 0; c < W; c++) {
        double prob = 0.05;  // TODO 履歴から確率を推定する
        if (marathon::uniform(0.0, 1.0) < prob) {
            // double h_ = dist(marathon::engine);
            // int h = max(1, int(h_));

            // normal_distribution<> distp(0.8 * h_, 0.1 * h_);
            // double p_ = distp(marathon::engine);
            // int p = max(0, int(p_));
            int h = mean;
            int p = 0.8 * h;
            enemy_t e;
            e.hp = h;
            e.init_hp = h;
            e.power = p;
            state.board[H - 1][c] = e;
        }
    }
}
bool move_enemies(state_t &state) {
    for (int r = 0; r < H - 1; r++) {
        for (int c = 0; c < W; c++) {
            state.board[r][c] = state.board[r + 1][c];
        }
    }
    for (int c = 0; c < W; c++) {
        state.board[H - 1][c] = {-1, -1, -1};
    }
    return state.board[0][state.my_c].hp <= 0;
}
char greedy_op(state_t &state) {
    vector<double> scores(3, 0.0);
    for (int pi = 0; pi <= 2; pi++) {
        scores[pi] = marathon::uniform(0.01, 0.02);
        int c = state.my_c;
        if (pi == 0) {
            c--;
        } else if (pi == 2) {
            c++;
        }

        // 盤面の外
        if (c < 0 || c >= W) {
            scores[pi] += -1e18;
            continue;
        }

        // ゲームオーバー
        if (state.board[0][c].hp > 0) {
            scores[pi] += -1e16;
        }

        // 敵への攻撃
        for (int r = 1; r < H; r++) {
            int level = state.level();
            enemy_t e = state.board[r][c];
            if (e.hp <= 0) continue;

            int turns = (e.hp + level - 1) / level;

            if (turns > r) {
                scores[pi] += -1e10 * (H - r);  // 倒せるかどうか
            } else {
                double ratio = 1.0 * e.power / turns;
                // if (state.turn > 900) ratio = 1.0 * e.init_hp / turns;
                scores[pi] += ratio * 1e5;
            }
            break;
        }

        // 敵との近さ
        for (int d = 0; d < W; d++) {
            for (int r = 1; r < H; r++) {
                int distance = abs(c - d);
                enemy_t e = state.board[r][d];
                if (e.hp <= 0) continue;

                int level = state.level();  // 本当は途中でレベルが上がるが...

                int turns = (e.hp + level - 1) / level;
                if (turns + abs(c - d) > r) continue;  // 倒せるかどうか

                double ratio = 1.0 * e.power / turns;
                // if (state.turn > 900) ratio = 1.0 * e.init_hp / turns;
                scores[pi] += ratio / (distance + 1.0);  // TODO 適当
            }
        }
    }
    pair<double, int> max_score = {-1e50, -1};
    for (int i = 0; i <= 2; i++) {
        max_score = max({scores[i], i}, max_score);
    }
    if (max_score.second == 0) {
        return 'L';
    } else if (max_score.second == 2) {
        return 'R';
    } else {
        return 'S';
    }
}
bool move_attack(state_t &state, char op) {
    if (op == 'L') {
        state.my_c--;
    } else if (op == 'R') {
        state.my_c++;
    }
    if (state.my_c < 0 || state.my_c >= W) return false;
    if (state.board[0][state.my_c].hp > 0) return false;
    for (int i = 1; i < H; i++) {
        if (state.board[i][state.my_c].hp > 0) {
            state.board[i][state.my_c].hp -= state.level();
            // debug4(state.turn, i, state.my_c, state.level());
            if (state.board[i][state.my_c].hp <= 0) {
                state.total_power += state.board[i][state.my_c].power;
                state.total_hp += state.board[i][state.my_c].init_hp;
                state.board[i][state.my_c] = {-1, -1, -1};
            }
            break;
        }
    }
    return true;
}
double simulation_score(int pi, state_t &org_state) {
    double total_score = 0;
    {
        auto state = org_state;
        {
            // 初回移動
            char op = 'S';
            if (pi == 0) op = 'L';
            if (pi == 2) op = 'R';

            bool alive2 = move_attack(state, op);
            if (!alive2) return -1e8;
        }

        int init_turn = org_state.turn;

        int end_turn = 0;
        if (init_turn > 200) {
            end_turn = init_turn + 30;
        } else {
            end_turn = init_turn + 40;
        }
        end_turn = min(end_turn, 1000);

        for (int turn = init_turn + 1; turn <= end_turn; turn++) {
            state.turn = turn;
            bool alive1 = move_enemies(state);
            if (!alive1) {
                total_score -= 1e6;
                break;
            }
            generate_enemies(state);
            char op = greedy_op(state);
            bool alive2 = move_attack(state, op);

            // if (init_turn > 900) {
            // total_score += state.total_hp;
            //} else {
            total_score += state.total_power;
            //}

            if (!alive2) {
                total_score -= 1e6;
                break;
            }
        }
    }
    return total_score;
}
char select_op(state_t &state) {
    int turn = state.turn;

    vector<double> scores(3, 0.0);
    for (int pi = 0; pi <= 2; pi++) {
        scores[pi] = simulation_score(pi, state);
    }
    pair<double, int> max_score = {-1e50, -1};
    for (int i = 0; i <= 2; i++) {
        max_score = max({scores[i], i}, max_score);
    }
    if (max_score.second == 0) {
        return 'L';
    } else if (max_score.second == 2) {
        return 'R';
    } else {
        return 'S';
    }
}
int main() {
    marathon::marathon_init();
    if (LOCAL) {
        for (int c = 0; c < W; c++) {
            int p;
            cin >> p;
        }
    }
    state_t state;
    {
        state.total_power = 0;
        state.total_hp = 0;
        state.my_c = INIT_MY_C;
        for (int r = 0; r < H; r++) {
            for (int c = 0; c < W; c++) {
                state.board[r][c] = {-1, -1, -1};
            }
        }
    }
    for (int turn = 1; turn <= 1000; turn++) {
        state.turn = turn;
        bool alive1 = move_enemies(state);
        if (!alive1) break;
        read_enemies(state);
        char op = select_op(state);
        cout << op << endl;
        bool alive2 = move_attack(state, op);
        if (!alive2) break;
    }
    cerr << "score==" << state.total_hp << " turn==" << state.turn << " power==" << state.total_power << " time==" << marathon::now() << endl;
    return 0;
}