Все задачи на 5.10.17 13:00

uts/uts_2017_sum_py/2/RZ2T(SAM)_8.py

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+# RZ2T(SAM)_8.py
+import sys
+
+sys.stdin = open('input.txt', 'r')
+sys.stdout = open('output.txt', 'w')
+
+n = int(input())
+a = list(map(int, input().split()))
+
+counter_ros = 0
+counter_vio = 0
+ros = []
+vio = []
+
+for i in range(1, n+1):
+    if a[i-1] == i % 2:
+        if i % 2 == 0:
+            ros.append(i-1)
+            counter_ros += 1
+        else:
+            vio.append(i-1)
+            counter_vio += 1
+if counter_vio == counter_ros:
+    print(counter_ros)
+    for i in range(counter_ros):
+        print(ros[i]+1, ' ', vio[i]+1)
+else:
+    print(-1)
+# ------------------------------------------ #