create dev channel

zeta/py/completed/2565.py

@@ -0,0 +1,18 @@
+def solve(N, R):
+    R.sort()
+    U = [0 for i in range(N)]
+    U[0] = 1
+    for i in range(N):
+        t_u = []
+        for j in range(i):
+            if R[j][1] < R[i][1]:  # up
+                t_u.append(U[j] + 1)
+        else:
+            t_u.append(1)
+        U[i] = max(t_u)
+    return N - max(U)
+
+
+if __name__ == '__main__':
+    N = int(input())
+    print(solve(N, [list(map(int, input().split())) for _ in range(N)]))