oj.uz

Submission #77049

# Submission time Handle Problem Language Result Execution time Memory
77049 2018-09-20T11:50:35 Z antimirage Chessboard (IZhO18_chessboard) C++17
0 / 100
 35 ms 1312 KB 
#include <bits/stdc++.h>

using namespace std;

const int N = 1e5 + 5;

int n, k, x[2][N], y[2][N];

long long ans = 1e18;

long long calc (int i)
{
    long long res = 0;

    for (int j = 1; j <= k; j++)
    {
        if ((x[0][j] / i + y[0][j] / i) & 1)
            res++;
    }
    return min( res + (n * 1ll * n + 1) / 2 - (k - res), (k - res) + (n * 1ll * n) / 2  - res);
}

int main()
{
    cin >> n >> k;

    for (int i = 1; i <= k; i++)
    {
        scanf("%d%d", &x[0][i], &y[0][i]), x[0][i]--, y[0][i]--;
        scanf("%d%d", &x[1][i], &y[1][i]), x[1][i]--, y[1][i]--;
    }
    for (int i = 1; i * i <= n; i++)
    {
        if (n % i != 0) continue;

        ans = min(ans, calc(i) );
        ans = min(ans, calc(n / i) );
    }
    cout << ans << endl;
}
/**
6 8
3 3 3 3
1 2 1 2
3 4 3 4
5 5 5 5
4 3 4 3
4 4 4 4
2 1 2 1
3 6 3 6

4 1
4 1 4 4
**/

Compilation message

chessboard.cpp: In function 'int main()':
chessboard.cpp:29:53: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d%d", &x[0][i], &y[0][i]), x[0][i]--, y[0][i]--;
         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~
chessboard.cpp:30:53: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d%d", &x[1][i], &y[1][i]), x[1][i]--, y[1][i]--;
         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~

Subtask #1
0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 376 KB Output is correct
2 Incorrect 2 ms 508 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #2
0 / 8.0

# Verdict Execution time Memory Grader output
1 Incorrect 35 ms 1312 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
0 / 15.0

# Verdict Execution time Memory Grader output
1 Incorrect 3 ms 1312 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
0 / 16.0

# Verdict Execution time Memory Grader output
1 Incorrect 3 ms 1312 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #5
0 / 23.0

# Verdict Execution time Memory Grader output
1 Incorrect 35 ms 1312 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #6
0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 376 KB Output is correct
2 Incorrect 2 ms 508 KB Output isn't correct
3 Halted 0 ms 0 KB -