Submission #832179

#TimeUsernameProblemLanguageResultExecution timeMemory
832179skittles1412Wiring (IOI17_wiring)C++17
17 / 100
1087 ms7704 KiB
#include "bits/extc++.h" using namespace std; template <typename T, typename... U> void dbgh(const T& t, const U&... u) { cerr << t; ((cerr << " | " << u), ...); cerr << endl; } #ifdef DEBUG #define dbg(...) \ cerr << "L" << __LINE__ << " [" << #__VA_ARGS__ << "]: "; \ dbgh(__VA_ARGS__) #else #define dbg(...) #define cerr \ if (false) \ cerr #endif using ll = long long; #define endl "\n" #define long int64_t #define sz(x) int(std::size(x)) ll min_total_length(vector<int> arr_r, vector<int> arr_b) { vector<pair<int, bool>> arr; for (auto& a : arr_r) { arr.emplace_back(a, false); } for (auto& a : arr_b) { arr.emplace_back(a, true); } sort(begin(arr), end(arr)); int n = sz(arr); long dp[n + 1]; memset(dp, 0x3f, sizeof(dp)); dp[n] = 0; deque<int> inds[2]; for (int i = n - 1; i >= 0; i--) { if (i + 1 < n) { inds[arr[i + 1].second].push_front(i + 1); } auto [t, ty] = arr[i]; auto &me = inds[ty], &other = inds[!ty]; auto get_w = [&](int u, int v) -> long { return abs(arr[u].first - arr[v].first); }; auto get = [&](const deque<int>& arr, int ind) -> int { if (ind >= sz(arr)) { return n; } return arr[ind]; }; if (!sz(other)) { continue; } if (get(other, 0) < get(me, 0)) { long csum = 0; for (int j = 0; j < sz(other) && get(other, j) < get(me, 0); j++) { csum += get_w(i, other[j]); dp[i] = min(dp[i], csum + min(dp[other[j]], dp[other[j] + 1])); } } else { dp[i] = dp[i + 1] + get_w(i, other[0]); { int j, cnt = 0; long wsum = 0, last_m; for (j = i; j < n; j++) { if (arr[i].second == arr[j].second) { wsum -= arr[j].first; last_m = arr[j].first; cnt++; } else { wsum += arr[j].first; cnt--; } if (!cnt) { break; } } if (!cnt) { for (; j < n; j++) { if (arr[i].second == arr[j].second) { break; } dp[i] = min(dp[i], wsum + min(dp[j], dp[j + 1])); if (j + 1 < n) { wsum += arr[j + 1].first - last_m; } } } } // long csum = 0; // me.push_front(i); // for (int j = 0; j < sz(other) && j < sz(me); j++) { // long xsum = csum; // for (int k = j; k < sz(other); k++) { // xsum += get_w(me[j], other[k]); // dp[i] = // min(dp[i], // xsum + dp[min(get(other, k + 1), get(me, j + // 1))]); // } // csum += get_w(me[j], other[j]); // } // me.pop_front(); } } return dp[0]; }

Compilation message (stderr)

wiring.cpp: In function 'll min_total_length(std::vector<int>, std::vector<int>)':
wiring.cpp:106:54: warning: 'last_m' may be used uninitialized in this function [-Wmaybe-uninitialized]
  106 |                             wsum += arr[j + 1].first - last_m;
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