0_0_23405089_10897.cpp:5:1: error: '_int64' does not name a type _int64 a[maxn]={0}; ^ 0_0_23405089_10897.cpp: In function 'int main()': 0_0_23405089_10897.cpp:10:5: error: 'a' was not declared in this scope a[1]=1; ^