Submission #1067804

#	Time	Username	Problem	Language	Result	Execution time	Memory
1067804		sleepntsheep	Wombats (IOI13_wombats)	C++17	43 / 100	3024 ms	16892 KiB

wombats

#include "wombats.h"
#include <set>
#include <algorithm>
#include <cstring>
#include <vector>
using namespace std;

template <typename T>
using ve = vector<T>;


int r, c, at[9999], h[5000][200], v[5000][200];
int sum = 0;

int changes = 0;


int c_is_2_dp(int V1, int V2) {
	static int dp[5001][2];
	dp[0][V1] = 0;
	dp[0][!V1] = h[0][0];
	for (int i = 1; i < r; ++i) {
		dp[i][0] = dp[i - 1][0] + v[i - 1][0];
		dp[i][1] = dp[i - 1][1] + v[i - 1][1];
		dp[i][0] = min(dp[i][0], dp[i][1] + h[i][0]);
		dp[i][1] = min(dp[i][1], dp[i][0] + h[i][0]);
	}
	return dp[r - 1][V2];
}

void changeH(int P, int Q, int W) {
	if (c <= 100) {
		h[P][Q] = W;
	}

	++changes;
}

void changeV(int P, int Q, int W) {
	if (c == 1) {
		sum += W - at[P];
		at[P] = W;
	} else if (c <= 100) {
		v[P][Q] = W;
	}

	++changes;
}

static int floyd[401][401];
void init(int R, int C, int H[5000][200], int V[5000][200]) {
	r = R, c = C;

	if (c == 1)
		for (int i = 0; i < r; ++i) changeV(i, 0, V[i][0]);
	else if (c == 2) {
		for (int i = 0; i < r; ++i) {
			if (i + 1 < r)
				changeV(i, 0, V[i][0]), changeV(i, 1, V[i][1]);
			changeH(i, 0, H[i][0]);
		}
	} 
	if (r <= 20 and c <= 20) {
		auto id = [&](int p, int q) { return p * c + q; };
		memset(floyd, 63, sizeof floyd);
		for (int i = 0; i < r * c; ++i) floyd[i][i] = 0;
		for (int i = 0; i + 1 < r; ++i) for (int j = 0; j < c; ++j) {
			int u = id(i, j), v = id(i + 1, j);
			floyd[u][v] = min(floyd[u][v], V[i][j]);
		}
		for (int i = 0 ; i < r; ++i) for (int j = 0; j + 1 < c; ++j) {
			int u = id(i, j), v = id(i, j + 1);
			floyd[u][v] = min(floyd[u][v], H[i][j]);
			floyd[v][u] = min(floyd[v][u], H[i][j]);
		}
		for (int bruh=3;bruh--;)for(int i=0;i<r*c;++i)for(int j=0;j<r*c;++j)for(int k=0;k<r*c;++k)
			floyd[i][j]=min(floyd[i][j],floyd[i][k]+floyd[k][j]);
	} 
	if (r <= 100 and c <= 100) {
		for (int i = 0; i + 1 < r; ++i) for (int j = 0; j < c; ++j)
			changeV(i, j, V[i][j]);
		for (int i = 0 ; i < r; ++i) for (int j = 0; j + 1 < c; ++j)
			changeH(i, j, H[i][j]);
	}
}

int escapes = 0;
int escape(int V1, int V2) {
	if (c == 1)
		return sum;
	else if (c == 2)
		return c_is_2_dp(V1, V2);
	else if (r <= 20 and c <= 20 and 0 == changes)
		return floyd[V1][c * (r - 1) + V2];
	else if (r <= 100 and c <= 100 and ++escapes <= 100) {
		set<tuple<int, int, int>> hp;
		static int dp[101][101];
		memset(dp, 63, sizeof dp);
		hp.emplace(dp[0][V1] = 0, 0, V1);
		while (hp.size()) {
			auto [cst, y, x] = *hp.begin();
			hp.erase(hp.begin());
			if (y == r - 1 and x == V2)
				return cst;
			auto nq = [&](int ww, int ny, int nx) {
				if (dp[ny][nx] > cst + ww) {
					hp.erase({dp[ny][nx], ny, nx});
					dp[ny][nx] = cst + ww;
					hp.emplace(dp[ny][nx], ny, nx);
				}
			};
			if (x + 1 < c) nq(h[y][x], y, x + 1);
			if (y + 1 < r) nq(v[y][x], y + 1, x);
			if (x) nq(h[y][x - 1], y, x - 1);
		}
	}

	__builtin_trap();

}

Compilation message (stderr)

grader.c: In function 'int main()':
grader.c:15:6: warning: variable 'res' set but not used [-Wunused-but-set-variable]
   15 |  int res;
      |      ^~~

• Subtask 1: 9 / 9
• Subtask 2: 0 / 12
• Subtask 3: 16 / 16
• Subtask 4: 18 / 18
• Subtask 5: 0 / 21
• Subtask 6: 0 / 24