#10817. 遇到-1之前的偶数个数

C++ 11

GCC 8.2.0

C++ 17

GCC 8.2.0

C++ (NOI)

GCC 4.8.4 (NOILinux 1.4.1)

C++ 11 (NOI)

GCC 4.8.4 (NOILinux 1.4.1)

C++ 11 (Clang)

Clang 7.0.1

C++ 17 (Clang)

Clang 7.0.1

C

Clang 7.0.1

C (NOI)

GCC 4.8.4 (NOILinux 1.4.1)

C#

Mono 5.16.0.220

Java

OpenJDK 10.0.2

Pascal

Free Pascal 3.0.4

Python 2

PyPy 6.0.0 (Python 2.7.13)

Python 3

PyPy 6.0.0 (Python 3.5.3)

Node.js

10.14.0

Ruby

2.5.1

Haskell

GHC 8.6.2