# | Time | Username | Problem | Language | Result | Execution time | Memory |
---|---|---|---|---|---|---|---|
293775 | BThero | Furniture (JOI20_furniture) | C++17 | 3991 ms | 7628 KiB |
This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
// chrono::system_clock::now().time_since_epoch().count()
#include<bits/stdc++.h>
#define pb push_back
#define eb emplace_back
#define mp make_pair
#define fi first
#define se second
#define all(x) (x).begin(), (x).end()
#define debug(x) cerr << #x << " = " << x << endl;
using namespace std;
typedef long long ll;
typedef pair<int, int> pii;
const int MAXN = (int)1e3 + 5;
const int MAXM = (int)1e6 + 9;
int dp[MAXN][MAXN];
char s[MAXN][MAXN];
int n, m, q;
vector<array<int, 3>> todo;
bool go(int diag, int l, int r) {
if (l > r) {
return 0;
}
if (diag == 0) {
return 1;
}
todo.pb({diag, l, r});
int nl = l, nr = r - 1;
int x = l - 1, y = diag - l;
if (x >= 0 && dp[x][y + 1] == 0) {
nl--;
}
x = r, y = diag - r - 1;
if (y >= 0 && dp[x + 1][y] == 0) {
nr++;
}
return go(diag - 1, nl, nr);
}
void solve() {
scanf("%d %d", &n, &m);
for (int i = 0; i < n; ++i) {
for (int j = 0; j < m; ++j) {
scanf(" %c", &s[i][j]);
}
}
scanf("%d", &q);
for (int x = n - 1; ~x; --x) {
for (int y = m - 1; ~y; --y) {
if (x == n - 1 && y == m - 1) {
dp[x][y] = 1;
continue;
}
dp[x][y] = 0;
if (s[x][y] != '1') {
dp[x][y] |= dp[x + 1][y];
dp[x][y] |= dp[x][y + 1];
}
}
}
for (int i = 1; i <= q; ++i) {
int x, y;
scanf("%d %d", &x, &y);
--x;
--y;
if (dp[x][y] == 0) {
s[x][y] = '1';
printf("1\n");
continue;
}
todo.clear();
if (go(x + y, x, x)) {
printf("0\n");
}
else {
printf("1\n");
s[x][y] = '1';
for (auto &[diag, l, r] : todo) {
for (int i = l; i <= r; ++i) {
dp[i][diag - i] = 0;
}
}
}
}
}
int main() {
int tt = 1;
while (tt--) {
solve();
}
return 0;
}
Compilation message (stderr)
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