oj.uz

Submission #73700

# Submission time Handle Problem Language Result Execution time Memory
73700 2018-08-28T17:45:51 Z georgerapeanu Robots (APIO13_robots) C++11
30 / 100
 451 ms 40948 KB 
#define JUDGE 1
#include <cstdio>
#include <vector>
#include <cstdlib>
#include <algorithm>

using namespace std;

#if JUDGE
FILE *f = stdin;
FILE *g = stdout;
#else
FILE *f = fopen("robots.in","r");
FILE *g = fopen("robots.out","w");
#endif
int n,w,h;
int dp[505][505][9][9];
pair<int,int> where_do_i_end[505][505][4];
char C[505][505];

const int dx[] = {-1,0,1,0};
const int dy[] = {0,1,0,-1};
const int inf = 1 << 28;

const int MAX_COST = 2.5e4;

vector< pair<int,int> > chestii[MAX_COST];

int start_cost = inf;

inline void push(int x,int y,int cost){
    if(cost >= MAX_COST){
        return ;
    }
	chestii[cost].push_back({x,y});
	start_cost = min(start_cost,cost);
}

void solve(int st,int dr){
	for(int cost = start_cost;cost < MAX_COST;cost++){
		for(auto pos:chestii[cost]){
			if(dp[pos.first][pos.second][st][dr] != cost){
				continue;
			}
			for(int k = 0;k < 4;k++){
				pair<int,int> npos = where_do_i_end[pos.first][pos.second][k];
				if(npos.first == -1 && npos.second == -1){
					continue;
				}

				if(dp[npos.first][npos.second][st][dr] > cost + 1){
					dp[npos.first][npos.second][st][dr] = cost + 1;
					push(npos.first,npos.second,cost + 1);
				}
			}
		}
		chestii[cost].clear();
	}
	start_cost = inf;
}

int which_viz[505][505][4];
int last_viz;

pair<int,int> get_end(int i,int j,int k){
	if(where_do_i_end[i][j][k].first || where_do_i_end[i][j][k].second){
		return where_do_i_end[i][j][k];
	}

	if(C[i][j] == 'x'){
		where_do_i_end[i][j][k] = {-1,-1};
	}

	where_do_i_end[i][j][k] = {i,j};

	vector< pair<pair<int,int>,int> > V = {make_pair(make_pair(i,j),k)};
	which_viz[i][j][k] = ++last_viz;

	pair<int,int> ans = {-1,-1};


	for(int k = 0;k < (int)V.size();k++){
		int dir = (V[k].second + (C[V[k].first.first][V[k].first.second] == 'C') + (C[V[k].first.first][V[k].first.second] == 'A' ? 3:0)) & 3;
		int x = V[k].first.first + dx[dir];
		int y = V[k].first.second + dy[dir];

		if(!(x && y && x <= h && y <= w && C[x][y] != 'x')){
			ans = V[k].first;
			break;
		}

		else if(!which_viz[x][y][dir]){
			V.push_back({{x,y},dir});
			which_viz[x][y][dir] = last_viz;
		}

		else{
			if(which_viz[x][y][dir] != last_viz){
				ans = where_do_i_end[x][y][dir];
			}
			else{
				break;
			}
		}
	}

	for(auto it:V){
		where_do_i_end[it.first.first][it.first.second][it.second] = ans;
	}

	return where_do_i_end[i][j][k];
}

int main(){
	fscanf(f,"%d %d %d\n",&n,&w,&h);

	for(int i = 1;i <= h;i++){
		fgets(C[i] + 1,505,f);
	}


	for(int i = 1;i <= h;i++ ){
		for(int j = 1;j <= w;j++){
			for(int k = 0;k < 4;k++){
				where_do_i_end[i][j][k] = get_end(i,j,k);
			}
		}
	}

	for(int i = 1;i <= h;i++){
		for(int j = 1;j <= w;j++){
			for(int st = 0;st < n;st++){
				for(int dr = 0;dr < n;dr++){
					dp[i][j][st][dr] = inf;
				}
			}
		}
	}
	for(int i = 1;i <= h;i++){
		for(int j = 1;j <= w;j++){
			if('1' <= C[i][j] && C[i][j]  <= '9'){
				dp[i][j][C[i][j] - '1'][C[i][j] - '1'] = 0;
				push(i,j,0);
				solve(C[i][j] - '1',C[i][j] - '1');
			}
		}
	}
	for(int l = 1;l < 9;l++){
		for(int st = 0;st < n - l;st++){
			int dr = st + l;
			for(int i = 1;i <= h;i++){
				for(int j = 1;j <= w;j++){
						for(int k = st;k < dr;k++){
							dp[i][j][st][dr] = min(dp[i][j][st][k] + dp[i][j][k + 1][dr],dp[i][j][st][dr]);
						}
						push(i,j,dp[i][j][st][dr]);
				}
			}
			solve(st,dr);
		}
	}

	int ans = inf;

	for(int i = 1;i <= h;i++){
		for(int j = 1;j <= w;j++){
			if(ans > dp[i][j][0][n - 1]){
				ans = dp[i][j][0][n - 1];
			}
		}
	}

	fprintf(g,"%d\n",(ans == inf ? -1:ans));

	return 0;
}

Compilation message

robots.cpp: In function 'int main()':
robots.cpp:115:8: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  fscanf(f,"%d %d %d\n",&n,&w,&h);
  ~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
robots.cpp:118:8: warning: ignoring return value of 'char* fgets(char*, int, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   fgets(C[i] + 1,505,f);
   ~~~~~^~~~~~~~~~~~~~~~

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 888 KB Output is correct
2 Correct 3 ms 996 KB Output is correct
3 Correct 3 ms 1076 KB Output is correct
4 Correct 3 ms 1256 KB Output is correct
5 Correct 3 ms 1256 KB Output is correct

Subtask #2
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 888 KB Output is correct
2 Correct 3 ms 996 KB Output is correct
3 Correct 3 ms 1076 KB Output is correct
4 Correct 3 ms 1256 KB Output is correct
5 Correct 3 ms 1256 KB Output is correct
6 Correct 4 ms 1256 KB Output is correct
7 Correct 3 ms 1256 KB Output is correct
8 Correct 3 ms 1256 KB Output is correct
9 Correct 3 ms 1256 KB Output is correct
10 Correct 3 ms 1256 KB Output is correct

Subtask #3
0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 888 KB Output is correct
2 Correct 3 ms 996 KB Output is correct
3 Correct 3 ms 1076 KB Output is correct
4 Correct 3 ms 1256 KB Output is correct
5 Correct 3 ms 1256 KB Output is correct
6 Correct 4 ms 1256 KB Output is correct
7 Correct 3 ms 1256 KB Output is correct
8 Correct 3 ms 1256 KB Output is correct
9 Correct 3 ms 1256 KB Output is correct
10 Correct 3 ms 1256 KB Output is correct
11 Correct 339 ms 39308 KB Output is correct
12 Correct 71 ms 39308 KB Output is correct
13 Correct 162 ms 39308 KB Output is correct
14 Incorrect 451 ms 40948 KB Output isn't correct
15 Halted 0 ms 0 KB -

Subtask #4
0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 888 KB Output is correct
2 Correct 3 ms 996 KB Output is correct
3 Correct 3 ms 1076 KB Output is correct
4 Correct 3 ms 1256 KB Output is correct
5 Correct 3 ms 1256 KB Output is correct
6 Correct 4 ms 1256 KB Output is correct
7 Correct 3 ms 1256 KB Output is correct
8 Correct 3 ms 1256 KB Output is correct
9 Correct 3 ms 1256 KB Output is correct
10 Correct 3 ms 1256 KB Output is correct
11 Correct 339 ms 39308 KB Output is correct
12 Correct 71 ms 39308 KB Output is correct
13 Correct 162 ms 39308 KB Output is correct
14 Incorrect 451 ms 40948 KB Output isn't correct
15 Halted 0 ms 0 KB -