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Commit 3208984

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1 parent 2e47654 commit 3208984

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3 files changed

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+131
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If we meet a (
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Then () is a regular balanced string
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And (( is a palindrome
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No matter what, (x is always a good string and we will extract it
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-----
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If we meet a )
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Then, we cannot get a balanced string since it starts with )
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We can only get a palindrome
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All we need to do is find the next closed bracket !
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) ((((( ... ( )
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is a palindrome !
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-----
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void solve()
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{
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int length;
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string S;
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cin >> length >> S;
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int minimum_moves = 0, remaining = length;
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for(int i = 0; i + 1 < length; i++)
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{
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if(S[i] == '(')
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{
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minimum_moves++;
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remaining -= 2;
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i++;
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}
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else if(S[i] == ')')
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{
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int j = i + 1;
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while(j < length && S[j] != ')')
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{
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j++;
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}
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if(j == length)
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{
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break;
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}
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minimum_moves++;
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remaining -= (j - i + 1); //cout << "i = " << i << " j = " << j << "\n";
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i = j;
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}
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}
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cout << minimum_moves << " " << remaining << "\n";
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}
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We can always reach (x, y) in at most 2 moves
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If we are at the origin, then we need 0 moves
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If (x^2 + y^2) is a perfect square, then we need only 1 move
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Otherwise, we will go from (0, 0) -> (x, 0) -> (y, 0) in 2 moves !
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We will always need at most 2 moves !
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------
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int is_square(int n)
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{
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for(int i = 1; i*i <= n; i++)
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{
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if(i*i == n)
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{
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return true;
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}
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}
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return false;
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}
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void solve()
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{
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int x, y;
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cin >> x >> y;
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int answer = 0;
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if(x == 0 && y == 0)
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{
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answer = 0;
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}
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else if(is_square(x*x + y*y))
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{
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answer = 1;
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}
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else
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{
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answer = 2;
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}
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cout << answer << "\n";
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}
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Be greedy and Set A[i] = A[i] + X, unless it exceeds the limit
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------
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void solve()
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{
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int no_of_elements, x, y, max_limit;
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cin >> no_of_elements >> max_limit >> x >> y;
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long long sum = 0;
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vector <long long> A(no_of_elements + 1);
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for(int i = 1; i <= no_of_elements; i++)
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{
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if(A[i - 1] + x <= max_limit)
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{
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A[i] = A[i - 1] + x;
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}
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else
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{
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A[i] = A[i - 1] - y;
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}
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sum += A[i];
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}
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cout << sum << "\n";
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}

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