Submission #1190938

#	Time	Username	Problem	Language	Result	Execution time	Memory
1190938		lovrot	Red-blue table (IZhO19_stones)	C++20	100 / 100	129 ms	5192 KiB

stones

#include <cstdio>
#include <cstring>
#include <algorithm>
#include <vector>

#define deb(...) fprintf(stderr, __VA_ARGS__)

using namespace std;

const int N = 1010;
const int Z[2] = {'-', '+'};

int n, m;
int ans[N][N];

void task() { 
	scanf("%d%d", &n, &m);
	memset(ans, 0, sizeof(ans));
	
	printf("%d\n", max(m + m * (n - n / 2 - 1) / (m / 2 + 1), n + n * (m - m / 2 - 1) / (n / 2 + 1)));
	if(m + m * (n - n / 2 - 1) / (m / 2 + 1) > n + n * (m - m / 2 - 1) / (n / 2 + 1)) { 
		for(int i = 0, j = 0; i < m * (n - n / 2 - 1) / (m / 2 + 1); ++i) { 
			for(int k = 0; k < (m / 2 + 1); ++k, j = (j + 1) % m) { ans[i][j] ^= 1; }
		}

		for(int i = 0; i < n; ++i) { 
			for(int j = 0; j < m; ++j) printf("%c", Z[ans[i][j]]); 
			printf("\n");
		}
	} else { 
	
		for(int i = 0, j = 0; i < n * (m - m / 2 - 1) / (n / 2 + 1); ++i) { 
			for(int k = 0; k < (n / 2 + 1); ++k, j = (j + 1) % n) { ans[j][i] ^= 1; }
		}

		for(int i = 0; i < n; ++i) { 
			for(int j = 0; j < m; ++j) printf("%c", Z[1 ^ ans[i][j]]); 
			printf("\n");
		}
	}
}

int main() { 
	int t;
	scanf("%d", &t);
	for(; t--; ) task();
	return 0;
}

Compilation message (stderr)

stones.cpp: In function 'void task()':
stones.cpp:17:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   17 |         scanf("%d%d", &n, &m);
      |         ~~~~~^~~~~~~~~~~~~~~~
stones.cpp: In function 'int main()':
stones.cpp:45:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   45 |         scanf("%d", &t);
      |         ~~~~~^~~~~~~~~~

• Subtask 1: 17 / 17
• Subtask 2: 10 / 10
• Subtask 3: 16 / 16
• Subtask 4: 11 / 11
• Subtask 5: 15 / 15
• Subtask 6: 31 / 31