oj.uz

답안 #536690

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
536690 2022-03-13T21:37:43 Z LucaDantas Wall (CEOI14_wall) C++17
100 / 100
 385 ms 63316 KB 
#include <bits/stdc++.h>
using namespace std;

constexpr int maxn = 410;

int village[maxn][maxn]; // represents wether there is a village
pair<int,int> pai[maxn][maxn]; // represents the edge it came from on the first dijsktra

int horizontal[maxn][maxn], vertical[maxn][maxn];
bool blue_h[maxn][maxn], blue_v[maxn][maxn];

int n, m;

long long dist[maxn][maxn];
bool mark[maxn][maxn];

// que negocio feio
void dijkstra1() {
	memset(dist, 0x3f, sizeof dist);
	dist[1][1] = 0;
	priority_queue<tuple<long long, int, int>, vector<tuple<long long, int, int>>, greater<tuple<long long, int, int>>> q;
	q.push({0, 1, 1});

	while(q.size()) {
		auto [trash, x, y] = q.top(); q.pop();

		if(mark[x][y]) continue; mark[x][y] = 1;

		// [x][y] -> [x][y+1]
		if(y+1 <= m+1 && dist[x][y] + horizontal[x][y] < dist[x][y+1]) {
			dist[x][y+1] = dist[x][y] + horizontal[x][y];
			pai[x][y+1] = {x, y};
			q.push({dist[x][y+1], x, y+1});
		}
		// [x][y] -> [x][y-1]
		if(y-1 >= 1 && dist[x][y] + horizontal[x][y-1] < dist[x][y-1]) {
			dist[x][y-1] = dist[x][y] + horizontal[x][y-1];
			pai[x][y-1] = {x, y};
			q.push({dist[x][y-1], x, y-1});
		}
		// [x][y] -> [x+1][y]
		if(x+1 <= n+1 && dist[x][y] + vertical[x][y] < dist[x+1][y]) {
			dist[x+1][y] = dist[x][y] + vertical[x][y];
			pai[x+1][y] = {x, y};
			q.push({dist[x+1][y], x+1, y});
		}
		// [x][y] -> [x-1][y]
		if(x-1 >= 1 && dist[x][y] + vertical[x-1][y] < dist[x-1][y]) {
			dist[x-1][y] = dist[x][y] + vertical[x-1][y];
			pai[x-1][y] = {x, y};
			q.push({dist[x-1][y], x-1, y});
		}

	}
}

void go(int r, int c) {
	if(r == 1 && c == 1) return;
	if(pai[r][c] == pair<int,int>(r-1, c) && !blue_v[r-1][c]) {
		blue_v[r-1][c] = 1;
		go(r-1, c);
	} else if(pai[r][c] == pair<int,int>(r+1, c) && !blue_v[r][c]) {
		blue_v[r][c] = 1;
		go(r+1, c);
	} else if(pai[r][c] == pair<int,int>(r, c-1) && !blue_h[r][c-1]) {
		blue_h[r][c-1] = 1;
		go(r, c-1);
	} else if(pai[r][c] == pair<int,int>(r, c+1) && !blue_h[r][c]) {
		blue_h[r][c] = 1;
		go(r, c+1);
	}
}

void mark_blue() {
	// pinto os arredores de todas as vilas como azuis
	
	for(int i = 1; i <= n; i++)
		for(int j = 1; j <= m; j++)
			if(village[i][j]) go(i, j); // pinto o menor caminho de mim até a raiz de azul

	for(int i = 1; i <= n; i++) {
		for(int j = 1; j <= m; j++) {
			if(village[i][j]) {
				blue_h[i][j] = 1;
				blue_v[i][j] = 1;
				blue_h[i+1][j] = 1;
				blue_v[i][j+1] = 1;
			}
		}
	}

	// arestas especiais -> se eu nao colocar isso o cara pode simplesmente cruzar pelo canto superior esquerdo e a resposta vai ser 0
	blue_v[0][1] = 1;
	blue_h[1][0] = 1;
}

vector<pair<int,int>> g[4*maxn*maxn]; // meu indice é == 4*((i-1)*(m+1) + (j-1)) + id_quadrado

// id_quadrado:
// 00 == 0 -> left_up
// 01 == 1 -> right_up
// 10 == 2 -> left_down
// 11 == 3 -> right_down

void create_edges() {
	// arestas entre subpontos do mesmo ponto
	for(int i = 1; i <= n+1; i++) {
		for(int j = 1; j <= m+1; j++) {
			int id = 4*((i-1)*(m+1) + (j-1)); // id base pros proximos (vou somar id_qd pra obter o valor real)
			if(!blue_v[i-1][j]) // linha vindo de [i-1][j] -> [i][j]
				g[id].push_back({id+1, 0}), g[id+1].push_back({id, 0});
			
			if(!blue_v[i][j]) // linha [i][j] -> [i+1][j]
				g[id+2].push_back({id+3, 0}), g[id+3].push_back({id+2, 0});

			if(!blue_h[i][j-1]) // linha [i][j-1] -> [i][j]
				g[id].push_back({id+2, 0}), g[id+2].push_back({id, 0});

			if(!blue_h[i][j]) // linha [i][j] -> [i][j+1]
				g[id+1].push_back({id+3, 0}), g[id+3].push_back({id+1, 0});
		}
	}

	auto get = [](int i, int j) { return 4*((i-1)*(m+1) + (j-1)); };
	auto valid = [](int i, int j) { return i >= 1 && i <= n+1 && j >= 1 && j <= m+1; };

	// arestas entre subpontos de pontos diferentes (tem peso)
	for(int i = 1; i <= n+1; i++) {
		for(int j = 1; j <= m+1; j++) {
			int id = get(i, j);

			if(valid(i-1, j)) // [i-1][j] -> [i][j]
				g[id].push_back({get(i-1, j) + 2, vertical[i-1][j]}),
				g[id+1].push_back({get(i-1, j) + 3, vertical[i-1][j]});
			
			if(valid(i+1, j)) // [i][j] -> [i+1][j]
				g[id+2].push_back({get(i+1, j), vertical[i][j]}),
				g[id+3].push_back({get(i+1, j)+1, vertical[i][j]});
			
			if(valid(i, j-1)) // [i][j-1] -> [i][j]
				g[id].push_back({get(i, j-1)+1, horizontal[i][j-1]}),
				g[id+2].push_back({get(i, j-1)+3, horizontal[i][j-1]});

			if(valid(i, j+1)) // [i][j] -> [i][j+1]
				g[id+1].push_back({get(i, j+1), horizontal[i][j]}),
				g[id+3].push_back({get(i, j+1)+2, horizontal[i][j]});
		}
	}
}

long long dist2[maxn*maxn*4];
bool mark2[maxn*maxn*4];

void dijkstra2() {
	memset(dist2, 0x3f, sizeof dist2);
	priority_queue<pair<long long,int>, vector<pair<long long, int>>, greater<pair<long long, int>>> q;

	dist2[1] = 0; // 1 é o quadrado superior direito de [1][1]
	
	q.push({0, 1});
	
	while(q.size()) {
		int u = q.top().second; q.pop();
		if(mark2[u]) continue; mark2[u] = 1;

		for(auto [v, w] : g[u]) {
			if(dist2[v] > dist2[u] + w) {
				dist2[v] = dist2[u] + w;
				q.push({dist2[v], v});
			}
		}
	}
}

int main() {
	scanf("%d %d", &n, &m);
	for(int i = 1; i <= n; i++)
		for(int j = 1; j <= m; j++)
			scanf("%d", &village[i][j]);

	for(int i = 1; i <= n; i++)
		for(int j = 1; j <= m+1; j++)
			scanf("%d", &vertical[i][j]); // the edge from [i][j] to [i+1][j], [i][j] represents the top left square
	
	for(int i = 1; i <= n+1; i++)
		for(int j = 1; j <= m; j++)
			scanf("%d", &horizontal[i][j]); // [i][j] to [i][j+1]

	dijkstra1();

	mark_blue();

	create_edges();

	dijkstra2();

	printf("%lld\n", dist2[2]);
}

Compilation message

wall.cpp: In function 'void dijkstra1()':
wall.cpp:27:3: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
   27 |   if(mark[x][y]) continue; mark[x][y] = 1;
      |   ^~
wall.cpp:27:28: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if'
   27 |   if(mark[x][y]) continue; mark[x][y] = 1;
      |                            ^~~~
wall.cpp: In function 'void dijkstra2()':
wall.cpp:164:3: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
  164 |   if(mark2[u]) continue; mark2[u] = 1;
      |   ^~
wall.cpp:164:26: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if'
  164 |   if(mark2[u]) continue; mark2[u] = 1;
      |                          ^~~~~
wall.cpp: In function 'int main()':
wall.cpp:176:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
  176 |  scanf("%d %d", &n, &m);
      |  ~~~~~^~~~~~~~~~~~~~~~~
wall.cpp:179:9: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
  179 |    scanf("%d", &village[i][j]);
      |    ~~~~~^~~~~~~~~~~~~~~~~~~~~~
wall.cpp:183:9: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
  183 |    scanf("%d", &vertical[i][j]); // the edge from [i][j] to [i+1][j], [i][j] represents the top left square
      |    ~~~~~^~~~~~~~~~~~~~~~~~~~~~~
wall.cpp:187:9: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
  187 |    scanf("%d", &horizontal[i][j]); // [i][j] to [i][j+1]
      |    ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
30.0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Correct 12 ms 22740 KB Output is correct
2 Correct 13 ms 22740 KB Output is correct
3 Correct 15 ms 22740 KB Output is correct
4 Correct 15 ms 22748 KB Output is correct
5 Correct 13 ms 22740 KB Output is correct
6 Correct 15 ms 23124 KB Output is correct
7 Correct 14 ms 23124 KB Output is correct
8 Correct 13 ms 23160 KB Output is correct
9 Correct 12 ms 22996 KB Output is correct
10 Correct 17 ms 23124 KB Output is correct
11 Correct 14 ms 23252 KB Output is correct
12 Correct 14 ms 23252 KB Output is correct
13 Correct 15 ms 23380 KB Output is correct
14 Correct 15 ms 23252 KB Output is correct
15 Correct 17 ms 23196 KB Output is correct

Subtask #2
30.0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Correct 14 ms 23280 KB Output is correct
2 Correct 16 ms 23380 KB Output is correct
3 Correct 17 ms 23376 KB Output is correct
4 Correct 13 ms 23440 KB Output is correct
5 Correct 14 ms 23316 KB Output is correct
6 Correct 15 ms 23396 KB Output is correct
7 Correct 15 ms 23320 KB Output is correct
8 Correct 15 ms 23372 KB Output is correct
9 Correct 17 ms 23380 KB Output is correct
10 Correct 18 ms 23456 KB Output is correct
11 Correct 20 ms 23404 KB Output is correct
12 Correct 16 ms 23344 KB Output is correct
13 Correct 16 ms 23420 KB Output is correct
14 Correct 13 ms 23380 KB Output is correct
15 Correct 17 ms 23360 KB Output is correct
16 Correct 14 ms 23380 KB Output is correct
17 Correct 18 ms 23384 KB Output is correct
18 Correct 17 ms 23384 KB Output is correct

Subtask #3
40.0 / 40.0

# 결과 실행 시간 메모리 Grader output
1 Correct 92 ms 32536 KB Output is correct
2 Correct 80 ms 31024 KB Output is correct
3 Correct 86 ms 31536 KB Output is correct
4 Correct 80 ms 32380 KB Output is correct
5 Correct 111 ms 41932 KB Output is correct
6 Correct 77 ms 32264 KB Output is correct
7 Correct 206 ms 44232 KB Output is correct
8 Correct 180 ms 43608 KB Output is correct
9 Correct 145 ms 43388 KB Output is correct
10 Correct 229 ms 44888 KB Output is correct
11 Correct 215 ms 46656 KB Output is correct
12 Correct 61 ms 32040 KB Output is correct
13 Correct 184 ms 42788 KB Output is correct
14 Correct 241 ms 54712 KB Output is correct
15 Correct 295 ms 57252 KB Output is correct
16 Correct 329 ms 57376 KB Output is correct
17 Correct 323 ms 60260 KB Output is correct
18 Correct 351 ms 63316 KB Output is correct
19 Correct 385 ms 58528 KB Output is correct
20 Correct 273 ms 57036 KB Output is correct