oj.uz

Submission #73713

# Submission time Handle Problem Language Result Execution time Memory
73713 2018-08-28T18:02:15 Z georgerapeanu Robots (APIO13_robots) C++11
60 / 100
 1500 ms 134144 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 * 2;
 
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 16 ms 12024 KB Output is correct
2 Correct 15 ms 12132 KB Output is correct
3 Correct 15 ms 12168 KB Output is correct
4 Correct 13 ms 12324 KB Output is correct
5 Correct 14 ms 12324 KB Output is correct

Subtask #2
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 16 ms 12024 KB Output is correct
2 Correct 15 ms 12132 KB Output is correct
3 Correct 15 ms 12168 KB Output is correct
4 Correct 13 ms 12324 KB Output is correct
5 Correct 14 ms 12324 KB Output is correct
6 Correct 15 ms 12324 KB Output is correct
7 Correct 15 ms 12324 KB Output is correct
8 Correct 14 ms 12328 KB Output is correct
9 Correct 16 ms 12440 KB Output is correct
10 Correct 14 ms 12440 KB Output is correct

Subtask #3
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 16 ms 12024 KB Output is correct
2 Correct 15 ms 12132 KB Output is correct
3 Correct 15 ms 12168 KB Output is correct
4 Correct 13 ms 12324 KB Output is correct
5 Correct 14 ms 12324 KB Output is correct
6 Correct 15 ms 12324 KB Output is correct
7 Correct 15 ms 12324 KB Output is correct
8 Correct 14 ms 12328 KB Output is correct
9 Correct 16 ms 12440 KB Output is correct
10 Correct 14 ms 12440 KB Output is correct
11 Correct 348 ms 51928 KB Output is correct
12 Correct 74 ms 51928 KB Output is correct
13 Correct 151 ms 51928 KB Output is correct
14 Correct 580 ms 57196 KB Output is correct
15 Correct 279 ms 57196 KB Output is correct

Subtask #4
0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 16 ms 12024 KB Output is correct
2 Correct 15 ms 12132 KB Output is correct
3 Correct 15 ms 12168 KB Output is correct
4 Correct 13 ms 12324 KB Output is correct
5 Correct 14 ms 12324 KB Output is correct
6 Correct 15 ms 12324 KB Output is correct
7 Correct 15 ms 12324 KB Output is correct
8 Correct 14 ms 12328 KB Output is correct
9 Correct 16 ms 12440 KB Output is correct
10 Correct 14 ms 12440 KB Output is correct
11 Correct 348 ms 51928 KB Output is correct
12 Correct 74 ms 51928 KB Output is correct
13 Correct 151 ms 51928 KB Output is correct
14 Correct 580 ms 57196 KB Output is correct
15 Correct 279 ms 57196 KB Output is correct
16 Correct 625 ms 104624 KB Output is correct
17 Execution timed out 1570 ms 134144 KB Time limit exceeded
18 Halted 0 ms 0 KB -