class Solution1013 {
public boolean canThreePartsEqualSum(int[] A) {
int sum=0;
for(int num:A){
sum+=num;
}
int key=sum/3;
int group=0;
for(int i=0;i<A.length;i++){
key-=A[i];
if(key==0){
group++;
key=sum/3;
}
}
return group==3;
}
}