0_0_31908799_26673.cpp: In function 'int main()': 0_0_31908799_26673.cpp:6:2: error: '_int64' was not declared in this scope _int64 arr[21]; ^ 0_0_31908799_26673.cpp:8:2: error: 'arr' was not declared in this scope arr[1]=0;arr[2]=1; ^