Submission #942245

#TimeUsernameProblemLanguageResultExecution timeMemory
942245GhettoHomework (CEOI22_homework)C++17
23 / 100
403 ms496860 KiB
#include <bits/stdc++.h> using namespace std; using pii = pair<int, int>; const int MAX_N = 1e6 + 5; string str; int n; set<int> commas_at_depth[4 * MAX_N]; // Starts at 1 int type[4 * MAX_N]; // 1 = min, 2 = max, 3 = leaf void build(int u, int l, int r, int d) { // cout << u << " " << l << " " << r << " " << d << endl; if (l == r) { type[u] = 3; return; } type[u] = (str[l + 1] == 'i') ? 1 : 2; int i = *commas_at_depth[d].lower_bound(l); build(2 * u, l + 4, i - 1, d + 1); build(2 * u + 1, i + 1, r - 1, d + 1); } void precomp() { for (int i = 0; i < str.size(); i++) n += (bool) (str[i] == '?'); int depth = 0; for (int i = 0; i < str.size(); i++) { if (str[i] == '(') depth++; else if (str[i] == ')') depth--; else if (str[i] == ',') commas_at_depth[depth].insert(i); } build(1, 0, str.size() - 1, 1); // for (int i = 1; i <= 4 * n; i++) { // cout << i << ": " << type[i] << endl; // } } pii find_bounds(int u) { if (type[u] == 3) return {0, 0}; pii l_bounds = find_bounds(2 * u), r_bounds = find_bounds(2 * u + 1); int min_bound = (type[u] == 1) ? min(l_bounds.first, r_bounds.first) : l_bounds.first + r_bounds.first + 1; int max_bound = (type[u] == 1) ? l_bounds.second + r_bounds.second + 1 : min(l_bounds.second, r_bounds.second); return {min_bound, max_bound}; } int main() { // freopen("homework.in", "r", stdin); cin >> str; precomp(); pii bounds = find_bounds(1); int ans = n - bounds.first - bounds.second; cout << ans << '\n'; }

Compilation message (stderr)

Main.cpp: In function 'void precomp()':
Main.cpp:24:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   24 |     for (int i = 0; i < str.size(); i++) n += (bool) (str[i] == '?');
      |                     ~~^~~~~~~~~~~~
Main.cpp:27:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   27 |     for (int i = 0; i < str.size(); i++) {
      |                     ~~^~~~~~~~~~~~
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