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0_0_32921969_16467.cpp:1:236: fatal error: GCC4.9.2/lib/gcc/x86_64-w64-mingw32/4.9.2/include/stdio.h>mai: Invalid argument
 #include<stdio.h>main(){ int a[21],i,j,k,b,c,s=0; a[0]=0; a[1]=2; for(i=1;i<20;i++)  a[i+1]=a[i]+1; for(k=20;k>=1;k--) {    b=k/4;   c=0;      for(j=b;j>0;j--)      {     c=c+j;        } s=s+c;} s=s+a[21]; printf("总共有%d头牛\n",s); }
                                                                                                                                                                                                                                            ^
compilation terminated.