Submission #55968

#	Time	Username	Problem	Language	Result	Execution time	Memory
55968		youngyojun	Sandwich (JOI16_sandwich)	C++11	100 / 100	4126 ms	16856 KiB

sandwich

#include <bits/stdc++.h>
#define pb push_back
#define eb emplace_back
#define sz(V) ((int)(V).size())
#define allv(V) ((V).begin()),((V).end())
#define befv(V) ((V)[(sz(V)-2)])
#define sorv(V) sort(allv(V))
#define revv(V) reverse(allv(V))
#define univ(V) (V).erase(unique(allv(V)),(V).end())
#define clv(V) (V).clear()
#define upmin(a,b) (a)=min((a),(b))
#define upmax(a,b) (a)=max((a),(b))
#define INF (0x3f3f3f3f)
#define INFLL (0x3f3f3f3f3f3f3f3fll)
using namespace std;
typedef long long ll;

const int MAXH = 405;
const int MAXW = 405;

int dp[2][MAXH][MAXW];

bitset<(MAXH<<12)> chk, isp;
int CNT;

char A[MAXH][MAXW];

int H, W;

int g(char c, int dr) {
	if('N' == c) return !!(dr < 2);
	if('Z' == c) return !!(dr && dr < 3);
	return 0;
}

void f(int t, int y, int x) {
	if(chk[(y<<10)+x]) return;
	chk[(y<<10)+x] = true; CNT++;

	int ax = (t ? x+1 : x-1), by = ((!!t == ('N' == A[y][x])) ? y-1 : y+1);
	int at = !g(A[y][ax], x < ax ? 3 : 1), bt = !g(A[by][x], y < by ? 0 : 2);

	f(at, y, ax); f(bt, by, x);
	isp[(y<<10)+x] = (isp[(y<<10)+ax] && isp[(by<<10)+x]);
}

void init() {
	chk.reset(); isp.reset();
	for(int i = 0; i <= H+1; i++)
		chk[i<<10] = chk[(i<<10)+W+1] = isp[i<<10] = isp[(i<<10)+W+1] = true;
	for(int i = 0; i <= W+1; i++)
		chk[i] = chk[((H+1)<<10)+i] = isp[i] = isp[((H+1)<<10)+i] = true;
	CNT = 0;
}

int main() {
	scanf("%d%d", &H, &W);
	for(int i = 1; i <= H; i++) scanf(" %s", A[i]+1);

	for(int y = 1; y <= H; y++) {
		init();
		for(int x = 1; x <= W; x++) {
			f(0, y, x);
			dp[0][y][x] = isp[(y<<10)+x] ? CNT : INF;
		}
		init();
		for(int x = W; x; x--) {
			f(1, y, x);
			dp[1][y][x] = isp[(y<<10)+x] ? CNT : INF;
		}
	}

	for(int i = 1; i <= H; i++) {
		for(int j = 1; j <= W; j++) {
			int t = min(dp[0][i][j], dp[1][i][j]);
			printf("%d ", INF <= t ? -1 : t*2);
		}
		puts("");
	}
	return 0;
}

Compilation message (stderr)

sandwich.cpp: In function 'int main()':
sandwich.cpp:57:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%d", &H, &W);
  ~~~~~^~~~~~~~~~~~~~~~
sandwich.cpp:58:35: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  for(int i = 1; i <= H; i++) scanf(" %s", A[i]+1);
                              ~~~~~^~~~~~~~~~~~~~~

• Subtask 1: 35 / 35
• Subtask 2: 65 / 65