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0_0_13721989_26666.cpp:1:190: fatal error: GCC4.9.2/lib/gcc/x86_64-w64-mingw32/4.9.2/include/iostream>usin: Invalid argument
 #include<iostream>using namespace std;int sum ,a;int n , i;int main(){ while(scanf("%d" , &n)!=EOF, n) { sum=0; for(i=0;i<n;i++) { scanf("%d",&a); sum=sum^a; } printf("%d\n",sum阅读全文    
                                                                                                                                                                                              ^
compilation terminated.