Submission #918041

#	Time	Username	Problem	Language	Result	Execution time	Memory
918041		Boycl07	Robots (APIO13_robots)	C++17	10 / 100	23 ms	129892 KiB

robots

#include <bits/stdc++.h>

using namespace std;

typedef long long ll;

#define rep(i, n) for(int i = 1; i <= n; ++i)
#define forn(i, l, r) for(int i = l; i <= r; ++i)
#define ford(i, r, l) for(int i = r; i >= l; --i)
#define FOR(i, n) for(int i = 0; i < n; ++i)
#define fi first
#define se second
#define pii pair<int, int>
#define pll pair<ll, ll>
#define pb push_back
#define endl "\n"
#define task "note"
#define sz(a) int(a.size())
#define C(x, y) make_pair(x, y)
#define all(a) (a).begin(), (a).end()
#define bit(i, mask) (mask >> i & 1)

template<typename T> bool maximize(T &res, const T &val) { if (res < val){ res = val; return true; }; return false; }
template<typename T> bool minimize(T &res, const T &val) { if (res > val){ res = val; return true; }; return false; }

inline int readInt()       {char c;while(c=getchar(),c!='-'&&(c<'0'||c>'9'));bool sign=(c=='-');if(sign)c=getchar();int n=c-'0';while(c=getchar(),c>='0'&&c<='9')n=10*n+c-'0';return(!sign)?n:-n;}
inline ll readLong()       {char c;while(c=getchar(),c!='-'&&(c<'0'||c>'9'));bool sign=(c=='-');if(sign)c=getchar();ll  n=c-'0';while(c=getchar(),c>='0'&&c<='9')n=10*n+c-'0';return(!sign)?n:-n;}
inline string readString() {char c;while(c=getchar(),c==' '||c=='\n'||c=='\t');string s({c});while(c=getchar(),c!=EOF&&c!=' '&&c!='\n'&&c!='\t')s+=c;return s;}


const int N =  500 + 10;
const int M = 1e3 + 3;
const int N1 = 2e3 + 10;
const int K = 1e2 + 1;
const int MOD = 1e9 + 7;
const int INF = 0x3f3f3f3f;
const ll LINF = 1e17 + 2;
const int block_size = 500;
const int LOG = 29;
const int offset = N;
const int LIM = 11 ;
const int AL = 26;

int n, w, h;

int dx[] = {-1, 0, 1, 0};
int dy[] = {0, 1, 0, -1};

char a[N][N];
int idx[N][N];

vector<int> adj[N * N];

int dp[LIM][LIM][N * N];

bool in(int x, int y)
{
    return x >= 1 && y >= 1 && x <= h && y <= w && a[x][y] != 'x';
}

void solve()
{
    cin >> n >> w >> h;
    int cnt = 0;
    rep(i, h) rep(j, w)
    {
        cin >> a[i][j]; ++cnt;
        idx[i][j] = cnt;
    }

    rep(i, h) rep(j, w)
        if(in(i, j))
        {
            forn(d, 0, 3)
            if(!in(i + dx[d], j + dy[d]))
            {
                int cur = d;
                int x = i, y = j;

                while(in(x, y))
                {
                    adj[idx[x][y]].pb(idx[i][j]);
                    if(a[x][y] == 'A') cur = (cur + 1) & 3;
                    else if(a[x][y] == 'B') cur = (cur + 3) & 3;
                    x -= dx[cur]; y -= dy[cur];
                }

            }
        }
    memset(dp, 0x3f, sizeof dp);
    rep(i, h) rep(j, w) if(a[i][j] >= '1' && a[i][j] <= '9')
    {
        dp[a[i][j] - '0'][a[i][j] - '0'][idx[i][j]] = 0;
    }
    ford(l, n, 1) forn(r, l, n)
    {
        vector<pii> dist;
        forn(idx, 1, cnt)
        {
            forn(k, l, r - 1)
                minimize(dp[l][r][idx], dp[l][k][idx] + dp[k + 1][r][idx]);
            dist.pb({dp[l][r][idx], idx});
        }
        sort(all(dist));

        queue<int> q;

        int j = 0;

        while(!q.empty() || j < sz(dist))
        {
            if(q.empty())
            {
                if(dp[l][r][dist[j].se] == dist[j].fi) q.push(dist[j].se);
                ++j;
            }

            while(!q.empty())
            {
                int u = q.front(); q.pop();
                for(int v : adj[u]) if(minimize(dp[l][r][v], dp[l][r][u] + 1))
                    q.push(v);
            }
        }
    }

    int res = INF;
    rep(i, cnt) minimize(res, dp[1][n][i]);

    if(res == INF) cout << -1;
    else cout << res;

}

signed main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);

    int TC = 1;

    if(fopen(task".inp", "r"))
    {
        freopen(task".inp", "r", stdin);
        freopen(task".out", "w", stdout);
    }


    while(TC--)
    {
        solve();
        cout << endl;
    }

    return 0;
}

Compilation message (stderr)

robots.cpp: In function 'int main()':
robots.cpp:144:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  144 |         freopen(task".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
robots.cpp:145:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  145 |         freopen(task".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 0 / 20
• Subtask 3: 0 / 30
• Subtask 4: 0 / 40