oj.uz

Submission #155748

# Submission time Handle Problem Language Result Execution time Memory
155748 2019-09-30T08:40:24 Z arnold518 Robots (APIO13_robots) C++14
60 / 100
 1500 ms 115236 KB 
#include <bits/stdc++.h>
using namespace std;

typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;

const int MAXN = 500;
const int INF = 987654321;
const int MAXVAL = 1e6;

const int dy[]={-1, 1, 0, 0};
const int dx[]={0, 0, -1, 1};
const int dA[]={2, 3, 1, 0};
const int dC[]={3, 2, 0, 1};

int N, W, H;
char A[MAXN+10][MAXN+10];
pii dest[MAXN+10][MAXN+10][4];
int dp[MAXN+10][MAXN+10][10][10];

void dfs(int y, int x, int dir)
{
    if(dest[y][x][dir]!=pii(-1, -1)) return;
    int ndir;
    if(A[y][x]=='A') ndir=dA[dir];
    else if(A[y][x]=='C') ndir=dC[dir];
    else ndir=dir;

    int ny=y+dy[ndir], nx=x+dx[ndir];
    if(A[ny][nx]=='x')
    {
        dest[y][x][dir]={y, x};
        return;
    }
    dfs(ny, nx, ndir);
    dest[y][x][dir]=dest[ny][nx][ndir];
}

struct Queue
{
    int y, x, w;
    bool operator < (const Queue &p) const { return w>p.w; }
};

struct dequeue
{
    Queue arr[MAXVAL];
    int l, r;
    void init() { l=r=MAXVAL/2; }
    Queue front() { return arr[l]; }
    void push_back(Queue x) { arr[r++]=x; }
    void push_front(Queue x) { arr[--l]=x; }
    void pop_front () { l++; }
    bool empty() { return l==r; }
};
dequeue Q;

int main()
{
    int i, j, k, p, q;

    scanf("%d%d%d", &N, &W, &H);
    for(i=1; i<=H; i++) scanf("%s", A[i]+1);
    for(i=0; i<=H+1; i++) A[i][0]=A[i][W+1]='x';
    for(j=0; j<=W+1; j++) A[0][j]=A[H+1][j]='x';

    for(i=1; i<=H; i++) for(j=1; j<=W; j++) for(k=0; k<4; k++) dest[i][j][k]={-1, -1};
    for(i=1; i<=H; i++) for(j=1; j<=W; j++) for(k=0; k<4; k++)
    {
        if(dest[i][j][k]!=pii(-1, -1)) continue;
        dfs(i, j, k);
    }
    //for(i=1; i<=H; i++) { for(j=1; j<=W; j++) printf("(%d %d / %d %d / %d %d / %d %d) ", dest[i][j][0].first, dest[i][j][0].second, dest[i][j][1].first, dest[i][j][1].second, dest[i][j][2].first, dest[i][j][2].second, dest[i][j][3].first, dest[i][j][3].second); printf("\n"); }

    for(q=1; q<=N; q++) for(p=q; p>=1; p--)
    {
        vector<Queue> PQ;
        for(i=1; i<=H; i++) for(j=1; j<=W; j++) dp[i][j][p][q]=INF;
        if(p==q)
        {
            for(i=1; i<=H; i++) for(j=1; j<=W; j++)
            {
                int now;
                if(A[i][j]=='0'+p) now=0;
                else now=INF;
                PQ.push_back({i, j, now});
            }
        }
        else
        {
            for(i=1; i<=H; i++) for(j=1; j<=W; j++)
            {
                int now=INF;
                for(k=p; k<q; k++)
                {
                    now=min(now, dp[i][j][p][k]+dp[i][j][k+1][q]);
                }
                PQ.push_back({i, j, now});
            }
        }
        sort(PQ.begin(), PQ.end());
        Q.init();
        Q.push_back(PQ.back()); PQ.pop_back();

        while(!Q.empty())
        {
            while(!PQ.empty() && PQ.back().w==Q.front().w) Q.push_front(PQ.back()), PQ.pop_back();
            Queue T=Q.front(); Q.pop_front();
            //printf("%d %d %d\n", T.y, T.x, T.w);
            if(dp[T.y][T.x][p][q]<=T.w) continue;
            dp[T.y][T.x][p][q]=T.w;
            for(k=0; k<4; k++) if(dp[dest[T.y][T.x][k].first][dest[T.y][T.x][k].second][p][q]>T.w+1) Q.push_back({dest[T.y][T.x][k].first, dest[T.y][T.x][k].second, T.w+1});//, printf("?%d %d %d\n", dest[T.y][T.x][k].first, dest[T.y][T.x][k].second, T.w+1);
        }
        //printf("=======%d %d========\n", p, q);
        //for(i=1; i<=H; i++) { for(j=1; j<=W; j++) printf("%d ", dp[i][j][p][q]); printf("\n"); }
    }
    int ans=INF;
    for(i=1; i<=H; i++) for(j=1; j<=W; j++) ans=min(ans, dp[i][j][1][N]);
    if(ans==INF) printf("-1");
    else printf("%d", ans);
}

Compilation message

robots.cpp: In function 'int main()':
robots.cpp:63:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d%d%d", &N, &W, &H);
     ~~~~~^~~~~~~~~~~~~~~~~~~~~~
robots.cpp:64:30: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     for(i=1; i<=H; i++) scanf("%s", A[i]+1);
                         ~~~~~^~~~~~~~~~~~~~

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 376 KB Output is correct
2 Correct 2 ms 376 KB Output is correct
3 Correct 2 ms 376 KB Output is correct
4 Correct 2 ms 504 KB Output is correct
5 Correct 2 ms 504 KB Output is correct

Subtask #2
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 376 KB Output is correct
2 Correct 2 ms 376 KB Output is correct
3 Correct 2 ms 376 KB Output is correct
4 Correct 2 ms 504 KB Output is correct
5 Correct 2 ms 504 KB Output is correct
6 Correct 2 ms 376 KB Output is correct
7 Correct 2 ms 376 KB Output is correct
8 Correct 2 ms 376 KB Output is correct
9 Correct 2 ms 376 KB Output is correct
10 Correct 2 ms 504 KB Output is correct

Subtask #3
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 376 KB Output is correct
2 Correct 2 ms 376 KB Output is correct
3 Correct 2 ms 376 KB Output is correct
4 Correct 2 ms 504 KB Output is correct
5 Correct 2 ms 504 KB Output is correct
6 Correct 2 ms 376 KB Output is correct
7 Correct 2 ms 376 KB Output is correct
8 Correct 2 ms 376 KB Output is correct
9 Correct 2 ms 376 KB Output is correct
10 Correct 2 ms 504 KB Output is correct
11 Correct 443 ms 43684 KB Output is correct
12 Correct 44 ms 41840 KB Output is correct
13 Correct 262 ms 43668 KB Output is correct
14 Correct 569 ms 43572 KB Output is correct
15 Correct 439 ms 44116 KB Output is correct

Subtask #4
0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 376 KB Output is correct
2 Correct 2 ms 376 KB Output is correct
3 Correct 2 ms 376 KB Output is correct
4 Correct 2 ms 504 KB Output is correct
5 Correct 2 ms 504 KB Output is correct
6 Correct 2 ms 376 KB Output is correct
7 Correct 2 ms 376 KB Output is correct
8 Correct 2 ms 376 KB Output is correct
9 Correct 2 ms 376 KB Output is correct
10 Correct 2 ms 504 KB Output is correct
11 Correct 443 ms 43684 KB Output is correct
12 Correct 44 ms 41840 KB Output is correct
13 Correct 262 ms 43668 KB Output is correct
14 Correct 569 ms 43572 KB Output is correct
15 Correct 439 ms 44116 KB Output is correct
16 Correct 1086 ms 114688 KB Output is correct
17 Execution timed out 1544 ms 115236 KB Time limit exceeded
18 Halted 0 ms 0 KB -