oj.uz

Submission #294438

# Submission time Handle Problem Language Result Execution time Memory
294438 2020-09-08T23:01:32 Z ChrisT Furniture (JOI20_furniture) C++17
100 / 100
 466 ms 17920 KB 
#include <bits/stdc++.h>
using namespace std;
const int MN = 1e3+5, MOD = 1e9 + 7, BASE = 143;
bool canL[MN][MN], canR[MN][MN];
int a[MN][MN], cnt[MN * 2];
int main () {
	int n,m;
	scanf ("%d %d",&n,&m);
	for (int i = 1; i <= n; i++) {
		for (int j = 1; j <= m; j++) {
			scanf ("%d",&a[i][j]);
			canL[i][j] = !a[i][j] && (i*j==1 || canL[i-1][j] || canL[i][j-1]);
		}
	}
	for (int i = n; i >= 1; i--) {
		for (int j = m; j >= 1; j--) {
			canR[i][j] = !a[i][j] && ((i==n&&j==m)||canR[i+1][j]||canR[i][j+1]);
			cnt[i+j] += canR[i][j] && canL[i][j];
		}
	}
	function<void(int,int)> fixL = [&] (int x, int y) {
		if (x > n || y > m || !canL[x][y] || (canL[x][y] = canL[x-1][y] || canL[x][y-1])) return;
		cnt[x+y] -= canR[x][y];
		fixL(x+1,y); fixL(x,y+1);
	};
	function<void(int,int)> fixR = [&] (int x, int y) {
		if (x <= 0 || y <= 0 || !canR[x][y] || (canR[x][y] = canR[x+1][y] || canR[x][y+1])) return;
		cnt[x+y] -= canL[x][y];
		fixR(x-1,y); fixR(x,y-1);
	};
	int q; scanf ("%d",&q);
	while (q--) {
		int x,y;
		scanf ("%d %d",&x,&y);
		if (!(canL[x][y] && canR[x][y])) {printf ("1\n"); continue;}
		if (cnt[x+y] == 1) {printf ("0\n"); continue;}
		canL[x][y] = canR[x][y] = 0;
		--cnt[x+y];
		fixR(x-1,y); fixR(x,y-1);
		fixL(x+1,y); fixL(x,y+1);
		printf ("1\n");
	}
	return 0;
}

Compilation message

furniture.cpp: In function 'int main()':
furniture.cpp:8:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
    8 |  scanf ("%d %d",&n,&m);
      |  ~~~~~~^~~~~~~~~~~~~~~
furniture.cpp:11:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   11 |    scanf ("%d",&a[i][j]);
      |    ~~~~~~^~~~~~~~~~~~~~~
furniture.cpp:31:15: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   31 |  int q; scanf ("%d",&q);
      |         ~~~~~~^~~~~~~~~
furniture.cpp:34:9: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   34 |   scanf ("%d %d",&x,&y);
      |   ~~~~~~^~~~~~~~~~~~~~~

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 768 KB Output is correct
2 Correct 2 ms 896 KB Output is correct
3 Correct 3 ms 896 KB Output is correct
4 Correct 4 ms 1024 KB Output is correct
5 Correct 4 ms 1024 KB Output is correct
6 Correct 5 ms 1024 KB Output is correct
7 Correct 5 ms 1024 KB Output is correct
8 Correct 5 ms 1024 KB Output is correct
9 Correct 5 ms 1024 KB Output is correct

Subtask #2
95.0 / 95.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 768 KB Output is correct
2 Correct 2 ms 896 KB Output is correct
3 Correct 3 ms 896 KB Output is correct
4 Correct 4 ms 1024 KB Output is correct
5 Correct 4 ms 1024 KB Output is correct
6 Correct 5 ms 1024 KB Output is correct
7 Correct 5 ms 1024 KB Output is correct
8 Correct 5 ms 1024 KB Output is correct
9 Correct 5 ms 1024 KB Output is correct
10 Correct 13 ms 1024 KB Output is correct
11 Correct 5 ms 768 KB Output is correct
12 Correct 231 ms 10872 KB Output is correct
13 Correct 104 ms 7800 KB Output is correct
14 Correct 397 ms 15608 KB Output is correct
15 Correct 428 ms 15864 KB Output is correct
16 Correct 404 ms 16760 KB Output is correct
17 Correct 435 ms 17432 KB Output is correct
18 Correct 430 ms 17224 KB Output is correct
19 Correct 466 ms 17920 KB Output is correct
20 Correct 404 ms 17888 KB Output is correct
21 Correct 436 ms 17884 KB Output is correct