Все задачи на 5.10.17 13:00

uts/uts_2017_sum_py/1/RZ2T_9.py

@@ -0,0 +1,72 @@
+import sys
+
+sys.stdin = open('input.txt', 'r')
+sys.stdout = open('output.txt', 'w')
+
+n, m = list(map(int, input().split()))
+a = []
+for i in range(n):
+    a.append(list(map(int, input().split())))
+
+#for i in range(len(a)):
+#    print(a[i])
+
+def check(mas):
+    f = True
+    for i in range(len(mas)):
+        if mas[i] != mas[0]:
+            f = False
+    return f
+
+for i in range(len(a)):
+    if not check(a[i]):
+        print('NO')
+        quit()
+try:
+    slov = {}
+    pos = 0
+    last = a[pos][0]
+    slov[a[pos][0]] = 0
+    while a[pos][0] == last:
+        slov[a[pos][0]] += 1
+        last = a[pos][0]
+        pos += 1
+    last = a[pos][0]
+    ###
+    try:
+        if slov[a[pos][0]]:
+            print('NO')
+            quit()
+    except Exception:
+        pass
+    slov[a[pos][0]] = 0
+    while a[pos][0] == last:
+        slov[a[pos][0]] += 1
+        last = a[pos][0]
+        pos += 1
+    last = a[pos][0]
+    ###
+    try:
+        if slov[a[pos][0]]:
+            print('NO')
+            quit()
+    except Exception:
+        pass
+    slov[a[pos][0]] = 0
+    while len(a) != pos and a[pos][0] == last:
+        slov[a[pos][0]] += 1
+        last = a[pos][0]
+        pos += 1
+
+    #print(slov)
+    las = -1
+    for i in slov:
+        if las == -1:
+            las = slov[i]
+        elif las != slov[i]:
+            print('NO')
+            quit()
+except Exception:
+    print('NO')
+    quit()
+print('YES')