Abandoned warehouse

input/code.cpp: In function 'int main()':
input/code.cpp:56:24: warning: 'y0' may be used uninitialized in this function [-Wmaybe-uninitialized]
   56 |         while (x != x0 || y != y0) {
      |                ~~~~~~~~^~~~~~~~~~
input/code.cpp:56:24: warning: 'x0' may be used uninitialized in this function [-Wmaybe-uninitialized]
input/code.cpp:56:24: warning: 'y' may be used uninitialized in this function [-Wmaybe-uninitialized]
input/code.cpp:56:24: warning: 'x' may be used uninitialized in this function [-Wmaybe-uninitialized]

#include <bits/stdc++.h>
using namespace std;
using ll = long long;

int C[1001][1001];
int n, m;

int main() {
	cin >> n >> m;
	int x, y, x0, y0;
	for (int i = 0; i < n; ++i) {
		for (int j = 0; j < m; ++j) {
			char c;
			cin >> c;
			C[i][j] = 1e9;
			if (c == 'A') {
				y = i;
				x = j;
			} else if (c == 'B') {
				y0 = i;
				x0 = j;
			}
		}
	}
	C[y][x] = 1;
	queue<tuple<int,int,int>> Q;
	Q.push({x,y,1});
	while (!Q.empty()) {
		auto [x,y,w] = Q.front();
		if (x == x0 && y == y0) {
			break;
		}
		++w;
		Q.pop();
		if (x > 0 && C[y][x-1] == 0) {
			C[y][x-1] = w;
			Q.push({y,x-1,w});
		}
		if (y > 0 && C[y-1][x] == 0) {
			C[y-1][x] = w;
			Q.push({y-1,x,w});
		}
		if (x < m-1 && C[y][x+1] == 0) {
			C[y][x+1] = w;
			Q.push({y,x+1,w});
		}
		if (y < n-1 && C[y+1][x] == 0) {
			C[y+1][x] = w;
			Q.push({y+1,x,w});
		}
	}
	int w = C[y0][x0];
	string P;
	swap(x,x0);
	swap(y,y0);
	while (x != x0 || y != y0) {
		--w;
		if (x > 0 && C[y][x-1] == w) {
			P += 'R';
			--x;
		}
		if (y > 0 && C[y-1][x] == w) {
			P += 'D';
			--y;
		}
		if (x < m-1 && C[y][x+1] == w) {
			P += 'L';
			++x;
		}
		if (y < n-1 && C[y+1][x] == w) {
			P += 'U';
			++y;
		}
	}
	reverse(P.begin(), P.end());
	cout << P;
}

Test 1

Verdict: TIME LIMIT EXCEEDED

Test 2

Verdict: TIME LIMIT EXCEEDED

Test 3

Verdict: TIME LIMIT EXCEEDED

Test 4

Verdict: TIME LIMIT EXCEEDED

Test 5

Verdict: TIME LIMIT EXCEEDED

Test 6

Verdict: TIME LIMIT EXCEEDED

Test 7

Verdict: TIME LIMIT EXCEEDED

Test 8

Verdict: TIME LIMIT EXCEEDED

Test 9

Verdict: TIME LIMIT EXCEEDED

Test 10

Verdict: TIME LIMIT EXCEEDED

Test 11

Verdict: TIME LIMIT EXCEEDED

Test 12

Verdict: TIME LIMIT EXCEEDED

Test 13

Verdict: TIME LIMIT EXCEEDED

Test 14

Verdict: TIME LIMIT EXCEEDED

Test 15

Verdict: TIME LIMIT EXCEEDED

Test 16

Verdict: TIME LIMIT EXCEEDED