oj.uz

Submission #73710

# Submission time Handle Problem Language Result Execution time Memory
73710 2018-08-28T17:57:07 Z georgerapeanu Robots (APIO13_robots) C++11
60 / 100
 1500 ms 126884 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 + 10];
 
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 6264 KB Output is correct
2 Correct 9 ms 6376 KB Output is correct
3 Correct 8 ms 6400 KB Output is correct
4 Correct 8 ms 6512 KB Output is correct
5 Correct 8 ms 6568 KB Output is correct

Subtask #2
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 9 ms 6264 KB Output is correct
2 Correct 9 ms 6376 KB Output is correct
3 Correct 8 ms 6400 KB Output is correct
4 Correct 8 ms 6512 KB Output is correct
5 Correct 8 ms 6568 KB Output is correct
6 Correct 8 ms 6568 KB Output is correct
7 Correct 9 ms 6568 KB Output is correct
8 Correct 9 ms 6568 KB Output is correct
9 Correct 8 ms 6568 KB Output is correct
10 Correct 9 ms 6572 KB Output is correct

Subtask #3
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 9 ms 6264 KB Output is correct
2 Correct 9 ms 6376 KB Output is correct
3 Correct 8 ms 6400 KB Output is correct
4 Correct 8 ms 6512 KB Output is correct
5 Correct 8 ms 6568 KB Output is correct
6 Correct 8 ms 6568 KB Output is correct
7 Correct 9 ms 6568 KB Output is correct
8 Correct 9 ms 6568 KB Output is correct
9 Correct 8 ms 6568 KB Output is correct
10 Correct 9 ms 6572 KB Output is correct
11 Correct 400 ms 45964 KB Output is correct
12 Correct 85 ms 45964 KB Output is correct
13 Correct 197 ms 45964 KB Output is correct
14 Correct 659 ms 51216 KB Output is correct
15 Correct 311 ms 51216 KB Output is correct

Subtask #4
0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 9 ms 6264 KB Output is correct
2 Correct 9 ms 6376 KB Output is correct
3 Correct 8 ms 6400 KB Output is correct
4 Correct 8 ms 6512 KB Output is correct
5 Correct 8 ms 6568 KB Output is correct
6 Correct 8 ms 6568 KB Output is correct
7 Correct 9 ms 6568 KB Output is correct
8 Correct 9 ms 6568 KB Output is correct
9 Correct 8 ms 6568 KB Output is correct
10 Correct 9 ms 6572 KB Output is correct
11 Correct 400 ms 45964 KB Output is correct
12 Correct 85 ms 45964 KB Output is correct
13 Correct 197 ms 45964 KB Output is correct
14 Correct 659 ms 51216 KB Output is correct
15 Correct 311 ms 51216 KB Output is correct
16 Correct 692 ms 98664 KB Output is correct
17 Execution timed out 1588 ms 126884 KB Time limit exceeded
18 Halted 0 ms 0 KB -