1999. 최대최소 - DP?

baekjoon/cpp/c++/1999.cpp

@@ -0,0 +1,67 @@
+#include <bits/stdc++.h>
+
+int n, b, k;
+int matrix[251][251];
+int rmax[251][251], rmin[251][251];
+
+void getinput()
+{
+ std::cin >> n >> b >> k;
+ for (int i = 1; i <= n; i++)
+ {
+ for (int j = 1; j <= n; j++)
+ {
+ std::cin >> matrix[i][j];
+ }
+ }
+}
+
+void preprocess()
+{
+ for (int i = 1; i <= n; i++)
+ {
+ for (int j = 1; j <= n - b + 1; j++)
+ {
+ int max = 0, min = 251;
+ for (int k = 0; k < b; k++)
+ {
+ max = std::max(max, matrix[i][j + k]);
+ min = std::min(min, matrix[i][j + k]);
+ }
+ rmax[i][j] = max;
+ rmin[i][j] = min;
+ }
+ }
+}
+
+int solve(int i, int j)
+{
+ int max = 0, min = 251;
+ for (int k = 0; k < b; k++)
+ {
+ max = std::max(max, rmax[i + k][j]);
+ min = std::min(min, rmin[i + k][j]);
+ }
+ return max - min;
+}
+
+void solve()
+{
+ preprocess();
+
+ for (int a = 0; a < k; a++)
+ {
+ int i, j;
+ std::cin >> i >> j;
+ std::cout << solve(i, j) << '\n';
+ }
+}
+
+int main()
+{
+ std::ios::sync_with_stdio(false);
+ std::cin.tie(0);
+
+ getinput();
+ solve();
+}