oj.uz

Submission #108988

# Submission time Handle Problem Language Result Execution time Memory
108988 2019-05-03T13:02:39 Z nxteru Robots (APIO13_robots) C++14
30 / 100
 379 ms 164864 KB 
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef double D;
typedef pair<int,int> P;
#define M 1000000007
#define F first
#define S second
#define PB push_back
#define INF 2500000
struct t{
	int l,r,y,x;
};
int h,w,n,dx[4]={1,0,-1,0},dy[4]={0,1,0,-1},m[505][505],dp[9][9][505][505],ans=INF;
vector<P>g[505][505];
vector<t>q[2500000];
void dfs(int y,int x,int d,int py,int px){
	g[y][x].PB(P(py,px));
	if(m[y][x]==2)d++;
	if(m[y][x]==3)d+=3;
	d%=4;
	int ny=y+dy[d],nx=x+dx[d];
	if(0<=ny&&ny<h&&0<=nx&&nx<w&&m[ny][nx]!=1)dfs(ny,nx,d,py,px);
}
int main(void){
    scanf("%d%d%d",&n,&w,&h);
    for(int i=0;i<n;i++)for(int j=0;j<n;j++)for(int y=0;y<h;y++)for(int x=0;x<w;x++)dp[i][j][y][x]=INF;
    for(int i=0;i<h;i++){
		for(int j=0;j<w;j++){
			char c;
			scanf(" %c",&c);
			if(c=='x')m[i][j]=1;
			else if(c=='A')m[i][j]=2;
			else if(c=='C')m[i][j]=3;
			else if(c!='.'){
				int p=c-'1';
				dp[p][p][i][j]=0;
			}
		}
	}
	for(int i=0;i<h;i++){
		for(int j=0;j<w;j++){
			if(m[i][j]==1)continue;
			for(int k=0;k<4;k++){
				int ny=i+dy[k],nx=j+dx[k];
				if(nx<0||nx>=w||ny<0||ny>=h||m[ny][nx]==1){
					dfs(i,j,(k+2)%4,i,j);
				}
			}
		}
	}
	for(int k=0;k+1<n;k++){
		int mn=INF,mx=-1;
		for(int l=0;l+k<n;l++){
			int r=l+k;
			for(int i=0;i<h;i++){
				for(int j=0;j<w;j++){
					int d=dp[l][r][i][j];
					if(d!=INF){
						q[d].PB(t{d,l,i,j});
						mn=min(mn,d);
						mx=max(mx,d);
					}
				}
			}
		}
		queue<t>bfs;
		while(mn<=mx||!bfs.empty()){
			if(bfs.empty()||(mn<=mx&&mn==bfs.front().l)){
				for(int i=0;i<q[mn].size();i++)bfs.push(q[mn][i]);
				q[mn].clear();
				mn++;
			}
			int c=bfs.front().l,r=bfs.front().r,y=bfs.front().y,x=bfs.front().x;
			bfs.pop();
			for(int i=0;i<g[y][x].size();i++){
				int ny=g[y][x][i].F,nx=g[y][x][i].S;
				if(dp[r][r+k][ny][nx]>c+1){
					dp[r][r+k][ny][nx]=c+1;
					bfs.push(t{c+1,r,ny,nx});
				}
			}
		}
		for(int l=0;l+k+1<n;l++){
			int r=l+k+1;
			for(int e=l;e<r;e++){
				for(int i=0;i<h;i++){
					for(int j=0;j<w;j++){
						dp[l][r][i][j]=min(dp[l][r][i][j],dp[l][e][i][j]+dp[e+1][r][i][j]);
					}
				}
			}
		}
	}
	for(int i=0;i<h;i++)for(int j=0;j<w;j++)ans=min(ans,dp[0][n-1][i][j]);
	if(ans==INF)ans=-1;
	printf("%d\n",ans);
}

Compilation message

robots.cpp: In function 'int main()':
robots.cpp:70:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i=0;i<q[mn].size();i++)bfs.push(q[mn][i]);
                 ~^~~~~~~~~~~~~
robots.cpp:76:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    for(int i=0;i<g[y][x].size();i++){
                ~^~~~~~~~~~~~~~~
robots.cpp:26:10: 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:31:9: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
    scanf(" %c",&c);
    ~~~~~^~~~~~~~~~

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 64 ms 65016 KB Output is correct
2 Correct 63 ms 65016 KB Output is correct
3 Correct 65 ms 65024 KB Output is correct
4 Correct 61 ms 65144 KB Output is correct
5 Correct 70 ms 65144 KB Output is correct

Subtask #2
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 64 ms 65016 KB Output is correct
2 Correct 63 ms 65016 KB Output is correct
3 Correct 65 ms 65024 KB Output is correct
4 Correct 61 ms 65144 KB Output is correct
5 Correct 70 ms 65144 KB Output is correct
6 Correct 65 ms 65016 KB Output is correct
7 Correct 64 ms 65032 KB Output is correct
8 Correct 63 ms 65120 KB Output is correct
9 Correct 62 ms 65016 KB Output is correct
10 Correct 70 ms 65144 KB Output is correct

Subtask #3
0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 64 ms 65016 KB Output is correct
2 Correct 63 ms 65016 KB Output is correct
3 Correct 65 ms 65024 KB Output is correct
4 Correct 61 ms 65144 KB Output is correct
5 Correct 70 ms 65144 KB Output is correct
6 Correct 65 ms 65016 KB Output is correct
7 Correct 64 ms 65032 KB Output is correct
8 Correct 63 ms 65120 KB Output is correct
9 Correct 62 ms 65016 KB Output is correct
10 Correct 70 ms 65144 KB Output is correct
11 Runtime error 379 ms 164864 KB Execution killed with signal 11 (could be triggered by violating memory limits)
12 Halted 0 ms 0 KB -

Subtask #4
0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 64 ms 65016 KB Output is correct
2 Correct 63 ms 65016 KB Output is correct
3 Correct 65 ms 65024 KB Output is correct
4 Correct 61 ms 65144 KB Output is correct
5 Correct 70 ms 65144 KB Output is correct
6 Correct 65 ms 65016 KB Output is correct
7 Correct 64 ms 65032 KB Output is correct
8 Correct 63 ms 65120 KB Output is correct
9 Correct 62 ms 65016 KB Output is correct
10 Correct 70 ms 65144 KB Output is correct
11 Runtime error 379 ms 164864 KB Execution killed with signal 11 (could be triggered by violating memory limits)
12 Halted 0 ms 0 KB -