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Submission #287390

# Submission time Handle Problem Language Result Execution time Memory
287390 2020-08-31T16:38:25 Z Namnamseo Portals (BOI14_portals) C++17
100 / 100
 641 ms 92792 KB 
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<int,int> pp;
typedef pair<ll,ll> pll;
void read(int& x){ scanf("%d",&x); }
void read(ll& x){ scanf("%lld",&x); }
template<typename T,typename... Args>
void read(T& a,Args&... b){ read(a); read(b...); }
#define all(x) (x).begin(),(x).end()
#define pb push_back
#define eb emplace_back
#define x first
#define y second

int n, m;

inline int enc(int r, int c){ return (r-1)*m + c; }

char z[1010][1010];
int aL[1010][1010], aR[1010][1010], aD[1010][1010], aU[1010][1010];

void bm(){
	for(int i=1; i<=n; ++i){
		aL[i][0] = 1;
		for(int j=1; j<=m; ++j){
			aL[i][j] = aL[i][j-1];
			if(z[i][j] == '#') aL[i][j]=j+1;
		}
		aR[i][m+1] = m;
		for(int j=m; 1<=j; --j){
			aR[i][j] = aR[i][j+1];
			if(z[i][j] == '#') aR[i][j]=j-1;
		}
	}
	for(int j=1; j<=m; ++j){
		aU[0][j] = 1;
		for(int i=1; i<=n; ++i){
			aU[i][j] = aU[i-1][j];
			if(z[i][j] == '#') aU[i][j]=i+1;
		}
		aD[n+1][j] = n;
		for(int i=n; 1<=i; --i){
			aD[i][j] = aD[i+1][j];
			if(z[i][j] == '#') aD[i][j]=i-1;
		}
	}
}

vector<pp> e[1001*1001];
void be(){
	for(int i=1; i<=n; ++i){
		for(int j=1; j<=m; ++j){
			if(z[i][j]=='#') continue;
			int nd = 1e9;
			nd = min(nd, j - aL[i][j]);
			nd = min(nd, i - aU[i][j]);
			nd = min(nd, aR[i][j] - j);
			nd = min(nd, aD[i][j] - i);
			nd += 1;
			int me = enc(i, j);
			auto f = [&](int a, int b){
				//printf("%d,%d -> %d,%d\n", i, j, a, b);
				e[me].eb(enc(a, b), nd);
			};
			f(i, aL[i][j]);
			f(i, aR[i][j]);
			f(aU[i][j], j);
			f(aD[i][j], j);
			//putchar(10);
		}
	}
}

int dx[4]={0,1,0,-1};
int dy[4]={1,0,-1,0};

pp sp, ep;

priority_queue<pp> pq;
int dist[1001*1001];

int main()
{
	read(n, m);
	for(int i=1; i<=n; ++i){
		scanf("%s", z[i]+1);
		for(int j=1; j<=m; ++j){
			if(z[i][j] == 'S') sp={i, j};
			if(z[i][j] == 'C') ep={i, j};
		}
	}
	bm();
	be();
	int V = n*m;
	for(int i=1; i<=V; ++i) dist[i] = 1e9;
	int s = enc(sp.x, sp.y);
	dist[s]=0; pq.emplace(0, s);
	while(pq.size()){
		int d, p; tie(d, p)=pq.top(); pq.pop();
		if(-d != dist[p]) continue;
		int x=1+(p-1)/m, y=p-(x-1)*m;
		for(int d=0; d<4; ++d){
			int nx=x+dx[d], ny=y+dy[d];
			if(1<=nx && 1<=ny && nx<=n && ny<=m && z[nx][ny] != '#'){
				int np=enc(nx, ny);
				if(dist[np] > dist[p]+1){
					dist[np] = dist[p] + 1;
					pq.emplace(-dist[np], np);
				}
			}
		}
		for(auto t:e[p]){
			int q, d; tie(q, d)=t;
			if(dist[q] > dist[p]+d){
				dist[q] = dist[p]+d;
				pq.emplace(-dist[q], q);
			}
		}
	}
	printf("%d\n", dist[enc(ep.x, ep.y)]);
	return 0;
}

Compilation message

portals.cpp: In function 'void read(int&)':
portals.cpp:6:25: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
    6 | void read(int& x){ scanf("%d",&x); }
      |                    ~~~~~^~~~~~~~~
portals.cpp: In function 'void read(ll&)':
portals.cpp:7:24: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
    7 | void read(ll& x){ scanf("%lld",&x); }
      |                   ~~~~~^~~~~~~~~~~
portals.cpp: In function 'int main()':
portals.cpp:87:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   87 |   scanf("%s", z[i]+1);
      |   ~~~~~^~~~~~~~~~~~~~

Subtask #1
11.0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 21 ms 23928 KB Output is correct
2 Correct 16 ms 24064 KB Output is correct
3 Correct 16 ms 24064 KB Output is correct
4 Correct 19 ms 23936 KB Output is correct
5 Correct 16 ms 24064 KB Output is correct
6 Correct 18 ms 24064 KB Output is correct
7 Correct 22 ms 24064 KB Output is correct
8 Correct 18 ms 24064 KB Output is correct
9 Correct 17 ms 23968 KB Output is correct
10 Correct 16 ms 23936 KB Output is correct

Subtask #2
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 16 ms 23936 KB Output is correct
2 Correct 14 ms 24064 KB Output is correct
3 Correct 14 ms 24064 KB Output is correct
4 Correct 35 ms 23928 KB Output is correct
5 Correct 18 ms 24064 KB Output is correct
6 Correct 18 ms 24064 KB Output is correct
7 Correct 16 ms 24064 KB Output is correct
8 Correct 16 ms 24108 KB Output is correct
9 Correct 17 ms 24832 KB Output is correct
10 Correct 17 ms 24832 KB Output is correct
11 Correct 20 ms 24832 KB Output is correct
12 Correct 17 ms 24836 KB Output is correct
13 Correct 21 ms 24832 KB Output is correct
14 Correct 20 ms 23936 KB Output is correct
15 Correct 17 ms 24832 KB Output is correct
16 Correct 16 ms 23988 KB Output is correct

Subtask #3
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 16 ms 23936 KB Output is correct
2 Correct 16 ms 24044 KB Output is correct
3 Correct 15 ms 23988 KB Output is correct
4 Correct 17 ms 24056 KB Output is correct
5 Correct 27 ms 28536 KB Output is correct
6 Correct 29 ms 28620 KB Output is correct
7 Correct 30 ms 28672 KB Output is correct
8 Correct 27 ms 28672 KB Output is correct

Subtask #4
19.0 / 19.0

# Verdict Execution time Memory Grader output
1 Correct 18 ms 23936 KB Output is correct
2 Correct 19 ms 24092 KB Output is correct
3 Correct 19 ms 24064 KB Output is correct
4 Correct 18 ms 23936 KB Output is correct
5 Correct 17 ms 24064 KB Output is correct
6 Correct 23 ms 24064 KB Output is correct
7 Correct 21 ms 24064 KB Output is correct
8 Correct 18 ms 24064 KB Output is correct
9 Correct 16 ms 24832 KB Output is correct
10 Correct 19 ms 24832 KB Output is correct
11 Correct 20 ms 24832 KB Output is correct
12 Correct 23 ms 24832 KB Output is correct
13 Correct 19 ms 24832 KB Output is correct
14 Correct 30 ms 28456 KB Output is correct
15 Correct 28 ms 28544 KB Output is correct
16 Correct 30 ms 28672 KB Output is correct
17 Correct 28 ms 28672 KB Output is correct
18 Correct 29 ms 28928 KB Output is correct
19 Correct 32 ms 29312 KB Output is correct
20 Correct 32 ms 29304 KB Output is correct
21 Correct 27 ms 28544 KB Output is correct
22 Correct 41 ms 28536 KB Output is correct
23 Correct 51 ms 28544 KB Output is correct
24 Correct 31 ms 29304 KB Output is correct
25 Correct 33 ms 23928 KB Output is correct
26 Correct 18 ms 24832 KB Output is correct
27 Correct 16 ms 23936 KB Output is correct
28 Correct 28 ms 28672 KB Output is correct

Subtask #5
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 18 ms 23936 KB Output is correct
2 Correct 18 ms 24064 KB Output is correct
3 Correct 17 ms 24064 KB Output is correct
4 Correct 16 ms 23936 KB Output is correct
5 Correct 15 ms 24064 KB Output is correct
6 Correct 19 ms 24064 KB Output is correct
7 Correct 16 ms 24064 KB Output is correct
8 Correct 18 ms 24064 KB Output is correct
9 Correct 21 ms 24832 KB Output is correct
10 Correct 48 ms 24824 KB Output is correct
11 Correct 18 ms 24832 KB Output is correct
12 Correct 29 ms 24832 KB Output is correct
13 Correct 18 ms 24880 KB Output is correct
14 Correct 33 ms 28544 KB Output is correct
15 Correct 27 ms 28544 KB Output is correct
16 Correct 29 ms 28672 KB Output is correct
17 Correct 26 ms 28672 KB Output is correct
18 Correct 36 ms 28928 KB Output is correct
19 Correct 33 ms 29312 KB Output is correct
20 Correct 40 ms 29304 KB Output is correct
21 Correct 26 ms 28544 KB Output is correct
22 Correct 25 ms 28536 KB Output is correct
23 Correct 27 ms 28544 KB Output is correct
24 Correct 339 ms 77944 KB Output is correct
25 Correct 641 ms 92792 KB Output is correct
26 Correct 508 ms 92772 KB Output is correct
27 Correct 479 ms 92536 KB Output is correct
28 Correct 265 ms 72440 KB Output is correct
29 Correct 289 ms 73208 KB Output is correct
30 Correct 330 ms 73680 KB Output is correct
31 Correct 30 ms 29312 KB Output is correct
32 Correct 455 ms 92664 KB Output is correct
33 Correct 14 ms 23936 KB Output is correct
34 Correct 15 ms 24832 KB Output is correct
35 Correct 355 ms 80888 KB Output is correct
36 Correct 14 ms 23936 KB Output is correct
37 Correct 23 ms 28672 KB Output is correct
38 Correct 263 ms 76924 KB Output is correct
39 Correct 245 ms 69240 KB Output is correct