oj.uz

Submission #160402

# Submission time Handle Problem Language Result Execution time Memory
160402 2019-10-27T11:02:55 Z arnold518 Robots (APIO13_robots) C++14
100 / 100
 926 ms 63744 KB 
#pragma GCC optimize ("Ofast")
 
#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[10][10][MAXN+10][MAXN+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[p][q][i][j]=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[p][k][i][j]+dp[k+1][q][i][j]);
                }
                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[p][q][T.y][T.x]<=T.w) continue;
            dp[p][q][T.y][T.x]=T.w;
            for(k=0; k<4; k++) if(dp[p][q][dest[T.y][T.x][k].first][dest[T.y][T.x][k].second]>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[p][q][i][j]); printf("\n"); }
    }
    int ans=INF;
    for(i=1; i<=H; i++) for(j=1; j<=W; j++) ans=min(ans, dp[1][N][i][j]);
    if(ans==INF) printf("-1");
    else printf("%d", ans);
}

Compilation message

robots.cpp: In function 'int main()':
robots.cpp:65:10: 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:66:30: 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 380 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 508 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 380 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 508 KB Output is correct
11 Correct 265 ms 34696 KB Output is correct
12 Correct 13 ms 6900 KB Output is correct
13 Correct 144 ms 24112 KB Output is correct
14 Correct 348 ms 34632 KB Output is correct
15 Correct 257 ms 35316 KB Output is correct

Subtask #4
40.0 / 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 380 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 508 KB Output is correct
11 Correct 265 ms 34696 KB Output is correct
12 Correct 13 ms 6900 KB Output is correct
13 Correct 144 ms 24112 KB Output is correct
14 Correct 348 ms 34632 KB Output is correct
15 Correct 257 ms 35316 KB Output is correct
16 Correct 624 ms 60348 KB Output is correct
17 Correct 926 ms 61472 KB Output is correct
18 Correct 705 ms 63744 KB Output is correct
19 Correct 623 ms 60060 KB Output is correct
20 Correct 869 ms 61608 KB Output is correct