골드바흐 시리즈 6588, 9020, 17103 complete

zeta_python/9020.py

@@ -1,6 +0,0 @@
-N = int(input()
-P = []
-last = 2
-for _ in range(N):
-
-    # 골듭흐 파티션

zeta_python/completed/17103.py

@@ -0,0 +1,27 @@
+import sys
+
+T = int(sys.stdin.readline())
+
+P = [2]
+K = [0] * 1000005
+K[2] = True
+for i in range(2, 1000000 - 1):
+    for p in P:
+        if i % p == 0:
+            break
+        elif p * p > i:
+            P.append(i)
+            K[i] = 1
+            break
+    else:
+        P.append(i)
+        K[i] = 1
+        break
+for _ in range(T):
+    n = int(sys.stdin.readline())
+    c = 0
+    for i in range(2, n//2+1):
+        if K[i] and K[n - i]:
+            c += 1
+        i += 1
+    print(c)

zeta_python/completed/6588.py

@@ -0,0 +1,26 @@
+import sys
+
+P = [2]
+K = [False] * 1000005
+K[2] = True
+for i in range(2, 1000000 - 1):
+    for p in P:
+        if i % p == 0:
+            break
+        elif p * p > i:
+            P.append(i)
+            K[i] = True
+            break
+    else:
+        P.append(i)
+        K[i] = True
+        break
+while True:
+    n = int(sys.stdin.readline())
+    if n == 0:
+        break
+    i = 2
+    while not (K[i] and K[n - i]):
+        i += 1
+    else:
+        print(n, "=", i, "+", n - i)

zeta_python/completed/9020.py

@@ -0,0 +1,26 @@
+T = int(input())
+P = [2]
+K = [False, False, True] + [False for i in range(9999)]
+last = 2
+for _ in range(T):
+    n = int(input())
+    if n - 2 > last:
+        for i in range(last, n - 1):
+            for p in P:
+                if i % p == 0:
+                    break
+                elif p * p > i:
+                    P.append(i)
+                    K[i] = True
+                    break
+            else:
+                P.append(i)
+                K[i] = True
+                break
+    i = 0
+    while not (K[n//2 - i] and K[n//2 + i]):
+        i += 1
+    if n - 1 > last:
+        last = n - 1
+    print(n//2 - i, n//2 + i)
+# 골드바흐로 소수 여부를 False/True로 구별해 while 돌리는게 best