1985

   我的记忆是从1985那个秋天开始的,那个时候我8岁.

   这是四川一个很小的镇子,整个镇子在一条很缓的坡上,在坡的两边农民盖起木头搭成的房子,从坡顶到坡底,就成了一个小镇.外婆是幼儿园里的老师,我和外婆,妈妈3个人就住在幼儿园里临街的木头房子里.如果说童年是到8岁为止的化,我的整个童年就是在这个小镇幼儿园里的木屋里度过的.

   虽然幼儿园里有厕所,但我最喜欢到街对面婶婶家里去上厕所,其中一个重要的原因是:从小我的肠胃就不好,经常发生千钧一发的突发事件,而婶婶家里的厕所比较近,到幼儿园的厕所,则需要穿过大门,一个小走廊,一个大走廊,一个天井,再一个操场才能到.婶婶家的厕所则快许多,穿过他家所有的房间,最后有个院子,推开一扇木门,就到了,厕所是一个很深的大坑,在坑的边缘,架了一个很长的木头,一只脚在坑的边上,一只脚在木头上,就可以实施深水投掷了,在坑的中央上方,架着一个很大的笼子,里面养的猪,也许我也是因为可以在上厕所的时候和猪说说话比在幼儿园里一个人要好玩的多,才去婶婶家的厕所吧.

   那一年的9月,我离开了这片童年的土地.直到多年后才回去了一次.

   我的父亲在那年的9月来了,从成都骑着摩托来了,他很少来看我,至少在我的印象里,不过他每次来都有在小镇见不到的玩具.但是他看起来很凶,我从小就怕他,虽然很少见面.我浑浑噩噩的和母亲坐了很长时间的火车到了成都,父亲是一个人骑摩托回的成都,后来很津津乐道的说起,骑摩托翻越二郎山的经历...

   在成都火车站,母亲给我买了一瓶汽水(现在都不叫这个名字了吧,:)),我清晰的记得,如果直接喝完,是两毛五,如果带着瓶子走,是5毛,母亲付了五毛,我从小就很想喝汽水终于如愿以偿,至今我都耿耿于怀,如果我不带瓶子走,就可以喝两瓶,不过母亲付钱的那一刻,我觉得母亲是天底下最好的母亲.

   然后我5年后才再一次见到她.

### Codeforces Problem 1985 Solution or Question Details The reference provided mentions **Codeforces Round #432 (Div. 2)** but not specifically Problem 1985[^1]. However, it is important to note that Codeforces problems are typically categorized by their round numbers and individual problem identifiers like A, B, C, etc., rather than specific numerical IDs such as 1985. To address this query directly, let us consider the structure of similar problems often encountered in competitive programming platforms: #### General Approach for Competitive Programming Problems Competitive programming questions generally involve algorithmic challenges where constraints dictate efficient solutions using techniques such as dynamic programming, greedy algorithms, graph traversal, sorting, binary search, among others. The referenced material discusses scenarios involving bitmasking operations and optimization strategies within certain bounds[^4]. For instance, when solving a problem requiring evaluation across multiple subsets: ```cpp ans = INFINITY; for(bitmask = 0; bitmask < (1 << n); bitmask++) { int score = 0; int effort = 0; for(int i = 0; i < n; i++) { if ((bitmask >> i) & 1) { // Check if bit 'i' is turned on. score += fighters[i].score; effort += fighters[i].effort; } } bool valid = true; for(auto condition : conditions) { if (!satisfies_condition(score, effort, condition)) { valid = false; break; } } if(valid && meets_rank_requirements(rank, k)){ ans = std::min(ans, effort); } } ``` This code snippet demonstrates an approach commonly used in combinatorial subset selection with additional validation checks against predefined criteria. It aligns closely with subproblems described under references discussing bitmask-based enumeration methods. Additionally, another type of problem involves checking properties over ranges defined by pairs `(l,r)` which may require determining whether any column remains monotonically increasing after filtering rows accordingly[^2]: ```python def check_sorted_columns(table_rows_l_to_r): m = len(table_rows_l_to_r[0]) # Number of columns result = [] for j in range(m): col_is_non_decreasing = True prev_val = float('-inf') for row_index in range(len(table_rows_l_to_r)): current_value = table_rows_l_to_r[row_index][j] if current_value < prev_val: col_is_non_decreasing = False break prev_val = current_value if col_is_non_decreasing: result.append(j) return "Yes" if result else "No" ``` While these examples do not explicitly pertain to Problem 1985 due to lack of direct information about its content, they illustrate common patterns found in related contests hosted on Codeforces.
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