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// sort a array by using stacks

void sortSt(vector<int>& nums) {

st.push(nums[0]);

for(int i = 1; i < nums.size(); i++) {

while(!st.isEmpty() && nums[i] > st.peek()) {

bak.push(st.top());

st.pop();

}

st.push(nums[i])

while(!bak.isEmpty()) {

st.push(bak.top());

bak.pop();

}

}

int i = 0;

while(!st.isEmpty()) {

nums[i++] = st.top();

st.pop();

}

}