Submission #640234

#	Time	Username	Problem	Language	Result	Execution time	Memory
640234		maks007	Awesome Arrowland Adventure (eJOI19_adventure)	C++14	100 / 100	92 ms	8904 KiB

adventure

#include "bits/stdc++.h"

#define int long long

int it[] = {0,0,1,-1};
int jt[] = {1,-1,0,0};

int f(char ch, char c) {
	if(ch == 'S') {
		if(c == 'E') return 3;
		if(c == 'S') return 0;
		if(c == 'W') return 1;
		if(c == 'N') return 2;
	}
	if(ch == 'W') {
		if(c == 'E') return 2;
		if(c == 'S') return 3;
		if(c == 'W') return 0;
		if(c == 'N') return 1;
	}
	if(ch == 'E') {
		if(c == 'E') return 0;
		if(c == 'S') return 1;
		if(c == 'W') return 2;
		if(c == 'N') return 3;
	}
	if(ch == 'N') {	
		if(c == 'E') return 1;
		if(c == 'S') return 2;
		if(c == 'W') return 3;
		if(c == 'N') return 0;
	}
}

signed main () {
	int n, m;
	scanf("%lld%lld", &n, &m);
	char a[n][m];
	for(int i = 0; i < n; i ++) {
		for(int j = 0; j < m; j ++) std::cin >> a[i][j];
	}
	std::priority_queue <std::pair <int,std::pair <int,int> >  > q;
	int d[n][m];
	for(int i = 0; i < n; i ++) {
		for(int j = 0; j < m; j ++) d[i][j] = (int)1e16;
	}
	q.push({0, {n-1, m-1}});
	d[n-1][m-1] = 0;
	while(!q.empty()) {
		std::pair <int,int> v = q.top().second;
		q.pop();
		// printf("%lld %lld\n", v.first, v.second);
		for(int i = 0; i < 4; i ++) {
			int ni = v.first + it[i];
			int nj = v.second + jt[i];
			if(ni >= n || nj >= m || ni < 0 || nj < 0) continue;
			if(a[ni][nj] == 'X') continue;
			int cnt = 0;
			if(it[i] == -1) {
				cnt = f(a[ni][nj], 'S');
			}else if(jt[i] == -1) {
				cnt = f(a[ni][nj], 'E');
			}else if(jt[i] == 1) {
				cnt = f(a[ni][nj], 'W');
			}else {
				cnt = f(a[ni][nj], 'N');
			}
			if(d[ni][nj] > d[v.first][v.second] + cnt) {
				d[ni][nj] = d[v.first][v.second] + cnt;
				q.push({-d[ni][nj], {ni, nj}});
			}
		}
	}
	if(d[0][0] == (int)1e16) printf("-1");
	else 
	printf("%lld", d[0][0]);
	return 0;
}

Compilation message (stderr)

adventure.cpp: In function 'long long int f(char, char)':
adventure.cpp:33:1: warning: control reaches end of non-void function [-Wreturn-type]
   33 | }
      | ^
adventure.cpp: In function 'int main()':
adventure.cpp:37:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   37 |  scanf("%lld%lld", &n, &m);
      |  ~~~~~^~~~~~~~~~~~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 12 / 12
• Subtask 3: 12 / 12
• Subtask 4: 16 / 16
• Subtask 5: 50 / 50