oj.uz

Submission #73705

# Submission time Handle Problem Language Result Execution time Memory
73705 2018-08-28T17:49:52 Z georgerapeanu Robots (APIO13_robots) C++11
60 / 100
 1500 ms 131132 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 = 500 * 500;

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

int start_cost = inf;
int end_cost = 0;

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);
	end_cost = max(end_cost,cost);
}

void solve(int st,int dr){
	for(int cost = start_cost;cost <= end_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;
	end_cost = 0;
}

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:118:8: 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:121:8: 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 9 ms 6136 KB Output is correct
2 Correct 8 ms 6244 KB Output is correct
3 Correct 8 ms 6244 KB Output is correct
4 Correct 8 ms 6408 KB Output is correct
5 Correct 8 ms 6456 KB Output is correct

Subtask #2
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 9 ms 6136 KB Output is correct
2 Correct 8 ms 6244 KB Output is correct
3 Correct 8 ms 6244 KB Output is correct
4 Correct 8 ms 6408 KB Output is correct
5 Correct 8 ms 6456 KB Output is correct
6 Correct 7 ms 6456 KB Output is correct
7 Correct 7 ms 6456 KB Output is correct
8 Correct 8 ms 6456 KB Output is correct
9 Correct 7 ms 6456 KB Output is correct
10 Correct 8 ms 6584 KB Output is correct

Subtask #3
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 9 ms 6136 KB Output is correct
2 Correct 8 ms 6244 KB Output is correct
3 Correct 8 ms 6244 KB Output is correct
4 Correct 8 ms 6408 KB Output is correct
5 Correct 8 ms 6456 KB Output is correct
6 Correct 7 ms 6456 KB Output is correct
7 Correct 7 ms 6456 KB Output is correct
8 Correct 8 ms 6456 KB Output is correct
9 Correct 7 ms 6456 KB Output is correct
10 Correct 8 ms 6584 KB Output is correct
11 Correct 318 ms 46024 KB Output is correct
12 Correct 74 ms 46024 KB Output is correct
13 Correct 144 ms 46024 KB Output is correct
14 Correct 483 ms 51280 KB Output is correct
15 Correct 244 ms 51280 KB Output is correct

Subtask #4
0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 9 ms 6136 KB Output is correct
2 Correct 8 ms 6244 KB Output is correct
3 Correct 8 ms 6244 KB Output is correct
4 Correct 8 ms 6408 KB Output is correct
5 Correct 8 ms 6456 KB Output is correct
6 Correct 7 ms 6456 KB Output is correct
7 Correct 7 ms 6456 KB Output is correct
8 Correct 8 ms 6456 KB Output is correct
9 Correct 7 ms 6456 KB Output is correct
10 Correct 8 ms 6584 KB Output is correct
11 Correct 318 ms 46024 KB Output is correct
12 Correct 74 ms 46024 KB Output is correct
13 Correct 144 ms 46024 KB Output is correct
14 Correct 483 ms 51280 KB Output is correct
15 Correct 244 ms 51280 KB Output is correct
16 Correct 517 ms 98660 KB Output is correct
17 Execution timed out 1513 ms 131132 KB Time limit exceeded
18 Halted 0 ms 0 KB -