codeforces 388 div2 749B - Parallelogram is Back
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#include<stdio.h>int x[5],y[5];int main(){for(int i=0;i<3;i++)scanf("%d%d",&x[i],&y[i]);printf("3\n");for(int i=0;i<3;i++){int xx=x[i];int yy=y[i];int lx=x[ ( i+1 ) % 3] - x[ ( i+2 ) % 3];int ly=y[ ( i+1 ) % 3] - y[ ( i+2 ) % 3];printf("%d %d\n",xx+lx,yy+ly);}return 0; }
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