207 lines
6.8 KiB
C++
207 lines
6.8 KiB
C++
#include <iostream>
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#include<cstdio>
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#include<cstring>
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#include<algorithm>
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#include<cmath>
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using namespace std;
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struct node {
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int a[35][35];
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int n, m;
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void rota() {
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int b[35][35];
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for (int i = 0; i < n; ++i) {
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for (int j = 0; j < m; ++j) {
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b[j][n - i - 1] = a[i][j];
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}
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}
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swap(n, m);
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for (int i = 0; i < n; ++i)
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for (int j = 0; j < m; ++j)
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a[i][j] = b[i][j];
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}
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} p[4], s;
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int a[35][35];
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int n, m;
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int ans;
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node cur[5];
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void gao(int now) {
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if (now == 4) {
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for (int i = 0; i < 3; ++i)
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if (cur[i].n != cur[i + 1].n || cur[i].m != cur[i + 1].m)
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return;
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int minn = 100000;
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for (int i = 0; i < cur[0].n; ++i) {
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for (int j = 0; j < cur[0].m; ++j) {
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int sum = 0;
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for (int k = 0; k < 4; ++k) {
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sum += cur[k].a[i][j];
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}
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if (sum < minn)
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minn = sum;
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}
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}
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if (minn > ans)
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ans = minn;
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return;
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}
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cur[now] = p[now];
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gao(now + 1);
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for (int i = 0; i < 4; ++i) {
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cur[now].rota();
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gao(now + 1);
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}
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}
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int main() {
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while (scanf("%d%d", &n, &m) != EOF) {
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for (int i = 0; i < n; ++i)
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for (int j = 0; j < m; ++j)
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scanf("%d", &a[i][j]);
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ans = 0;
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if (n % 4 == 0) {
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for (int i = 0; i < 4; ++i) {
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for (int j = n / 4 * i; j < n / 4 * (i + 1); ++j) {
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for (int k = 0; k < m; ++k) {
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p[i].a[j % (n / 4)][k] = a[j][k];
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}
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}
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p[i].n = n / 4;
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p[i].m = m;
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}
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gao(0);
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}
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if (m % 4 == 0) {
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for (int i = 0; i < 4; ++i) {
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for (int j = 0; j < n; ++j) {
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for (int k = i * (m / 4); k < (i + 1) * m / 4; ++k) {
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p[i].a[j][k % (m / 4)] = a[j][k];
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}
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}
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p[i].n = n;
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p[i].m = m / 4;
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}
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gao(0);
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}
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if (n % 2 == 0 && m % 2 == 0) {
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for (int i = 0; i < 4; ++i) {
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for (int j = (i / 2) * n / 2; j < (i / 2 + 1) * n / 2; ++j) {
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for (int k = (i % 2) * m / 2; k < (i % 2 + 1) * m / 2;
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++k) {
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p[i].a[j % (n / 2)][k % (m / 2)] = a[j][k];
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}
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}
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p[i].n = n / 2;
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p[i].m = m / 2;
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}
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gao(0);
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}
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s.n = n;
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s.m = m;
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for (int i = 0; i < n; ++i)
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for (int j = 0; j < m; ++j)
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s.a[i][j] = a[i][j];
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if (n < m) {
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s.rota();
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swap(n, m);
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}
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if (3 * s.n == 4 * s.m && s.m % 3 == 0 && s.n % 4 == 0) {
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for (int i = 0; i < 3; ++i) {
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for (int j = 0; j < m; ++j) {
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for (int k = i * m / 3; k < (i + 1) * m / 3; ++k) {
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p[i].a[j][k % (m / 3)] = s.a[j][k];
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}
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}
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p[i].n = m;
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p[i].m = m / 3;
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}
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for (int i = m; i < n; ++i)
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for (int j = 0; j < m; ++j)
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p[3].a[i - m][j] = s.a[i][j];
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p[3].n = n - m;
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p[3].m = m;
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gao(0);
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for (int i = 0; i < 3; ++i) {
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for (int j = n - m; j < n; ++j) {
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for (int k = i * m / 3; k < (i + 1) * m / 3; ++k) {
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p[i].a[j - (n - m)][k % (m / 3)] = s.a[j][k];
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}
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}
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p[i].n = m;
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p[i].m = m / 3;
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}
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for (int i = 0; i < n - m; ++i)
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for (int j = 0; j < m; ++j)
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p[3].a[i][j] = s.a[i][j];
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p[3].n = n - m;
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p[3].m = m;
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gao(0);
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}
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if (s.n == 2 * s.m && s.m % 2 == 0) {
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for (int i = 0; i < n / 2; ++i)
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for (int j = 0; j < m / 2; ++j)
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p[0].a[i][j] = s.a[i][j];
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p[0].n = s.n / 2;
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p[0].m = s.m / 2;
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for (int i = 0; i < n / 2; ++i)
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for (int j = m / 2; j < m; ++j)
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p[1].a[i][j - m / 2] = s.a[i][j];
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p[1].n = s.n / 2;
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p[1].m = s.m / 2;
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for (int i = n / 2; i < n / 4 * 3; ++i)
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for (int j = 0; j < m; ++j)
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p[2].a[i - n / 2][j] = s.a[i][j];
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p[2].n = s.n / 4;
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p[2].m = s.m;
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for (int i = n / 4 * 3; i < n; ++i)
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for (int j = 0; j < m; ++j)
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p[3].a[i - n / 4 * 3][j] = s.a[i][j];
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p[3].n = n / 4;
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p[3].m = m;
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gao(0);
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for (int i = n / 4; i < n / 4 * 3; ++i)
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for (int j = 0; j < m / 2; ++j)
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p[0].a[i - n / 4][j] = s.a[i][j];
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p[0].n = s.n / 2;
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p[0].m = s.m / 2;
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for (int i = n / 4; i < n / 4 * 3; ++i)
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for (int j = m / 2; j < m; ++j)
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p[1].a[i - n / 4][j - m / 2] = s.a[i][j];
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p[1].n = s.n / 2;
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p[1].m = s.m / 2;
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for (int i = 0; i < n / 4; ++i)
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for (int j = 0; j < m; ++j)
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p[2].a[i][j] = s.a[i][j];
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p[2].n = s.n / 4;
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p[2].m = s.m;
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for (int i = n / 4 * 3; i < n; ++i)
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for (int j = 0; j < m; ++j)
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p[3].a[i - n / 4 * 3][j] = s.a[i][j];
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p[3].n = n / 4;
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p[3].m = m;
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gao(0);
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for (int i = n / 2; i < n; ++i)
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for (int j = 0; j < m / 2; ++j)
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p[0].a[i - n / 2][j] = s.a[i][j];
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p[0].n = s.n / 2;
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p[0].m = s.m / 2;
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for (int i = n / 2; i < n; ++i)
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for (int j = m / 2; j < m; ++j)
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p[1].a[i - n / 2][j - m / 2] = s.a[i][j];
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p[1].n = s.n / 2;
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p[1].m = s.m / 2;
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for (int i = 0; i < n / 4; ++i)
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for (int j = 0; j < m; ++j)
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p[2].a[i][j] = s.a[i][j];
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p[2].n = s.n / 4;
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p[2].m = s.m;
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for (int i = n / 4; i < n / 2; ++i)
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for (int j = 0; j < m; ++j)
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p[3].a[i - n / 4][j] = s.a[i][j];
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p[3].n = n / 4;
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p[3].m = m;
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gao(0);
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}
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printf("%d\n", ans);
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}
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return 0;
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}
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