This is because there are n! permutations of a vector of size n, and the function generates each permutation by recursively swapping elements, taking O(n) time for each permutation. ✨Time Complexity: The time complexity of this code is O(n*n!), where n is the size of the input vector nums. I hope this helps you understand how this code works! This generates all possible permutations by recursively swapping elements. The function then iterates over all elements from index idx to the end of the vector, swapping the element at index i with the element at index idx, calling itself recursively with idx+1, and then swapping the elements back. The base case for the recursion is when idx is equal to the size of nums, in which case the current permutation of nums is added to ans. It takes as input the vector nums, the vector of vectors ans, and an index idx. The function getPermuation is a recursive helper function that generates the permutations. The function permute takes as input a vector of integers nums and returns a vector of vectors ans containing all the permutations of nums. Here's a step-by-step explanation of the approach: Two-time world champions Germany failed to get out of their group for the first time in nine Women's World Cups, while South Korea finished bottom with a solitary point.Hey everyone Today I solved problem 46. Permutations on LeetCode using C++. Morocco, having lost to the Germans 6-0 in their opening game, recovered with back-to-back 1-0 victories and become the only one of the eight debutants at the 2023 Fifa World Cup to qualify from their group. Germany's failure to beat South Korea ensured Colombia topped Group H, despite losing to Morocco in their final first-round match. Italy won their opening game against Argentina - but both sides ultimately failed to progress. South Africa finished second with an historic 3-2 win over Italy in their final group match, reaching the knockout stages of a Fifa World Cup - women's or men's - for the first time. Sweden secured their place in the last 16 and a meeting with world champions the USA, by winning all three group matches. It's the first time in 28 years since Brazil, who have qualified for every tournament, have failed to get out of the group stages. World Cup greats Brazil started the round in third place and needed a win over Jamaica to progress, but the Reggae Girlz - ranked 35 places below the South Americans - held firm to earn a goalless draw and take themselves through to the last 16. Group Fįrance topped Group F with a 6-3 win over Panama, who had already been eliminated before their last group-stage match. The USA were held to draws by both the Dutch and Portugal - and were lucky not to be beaten by the latter, who saw Ana Capeta hit the post in injury time in their final game.ĭebutants Portugal and Vietnam both exit their maiden tournaments at the group stage. Netherlands secured top spot in the group with a 7-0 thrashing of Vietnam, condemning reigning champions the USA to second place. Group DĮngland progressed as group winners with three wins from three, including a 6-1 thrashing of China, to set up a last-16 meeting with Nigeria.ĭenmark followed the Lionesses through in second place, meaning China and tournament debutants Haiti head home. Both sides had already qualified for the round of 16 by winning their opening two games.Ĭosta Rica and Zambia were both eliminated heading into their meeting, which Zambia won 3-1 to seal a first World Cup victory in their tournament debut. Japan topped Group C after thrashing Spain 4-0 in their final group match. Nigeria reached the knockouts for just the third time in nine attempts, although their goalless draw with the Republic of Ireland meant they had to settle for second place.Ĭanada go out at the group stage for the first time since 2011, while a first Women's World Cup for the Republic ended with a solitary point. Not only did they manage that but their 4-0 thrashing of the Olympic champions was enough for them to top the group. Group BĪustralia needed to beat Canada in their final group game to avoid following co-hosts New Zealand out at the earliest point and a first group-stage exit since 2003. New Zealand become the first Women's World Cup hosts to be eliminated at the group stage, while Philippines, who finished bottom, did pick up a win on their global tournament debut against the co-hosts. Switzerland topped Group A as the only unbeaten side in the pool, with a goalless draw against co-hosts New Zealand securing their progress.įormer world champions Norway recovered from defeat at the hands of New Zealand in their opening game to advance in second place, beating debutants Philippines 6-0 in their final match.
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