Submission #1067521

#TimeUsernameProblemLanguageResultExecution timeMemory
1067521andrei_iorgulescuAliens (IOI16_aliens)C++14
41 / 100
2019 ms3728 KiB
#include <bits/stdc++.h> #include "aliens.h" #warning That's not FB, that's my FB using namespace std; using ll = long long; using ld = long double; const ld eps = 0.00000001d; int n, m; vector<int> l, r; bool cmp(pair<int,int> A, pair<int,int> B) { if (A.first != B.first) return A.first < B.first; return A.second > B.second; } void norma_intvs() { vector<pair<int,int>> vp; for (int i = 0; i < l.size(); i++) vp.push_back({l[i], r[i]}); sort(vp.begin(), vp.end(), cmp); l.clear(); r.clear(); int rmax = -1; for (auto it : vp) { if (it.second > rmax) { rmax = it.second; l.push_back(it.first); r.push_back(it.second); } } } struct ura { ld val; int cate; }; ura dp[200005]; void solve(ld cost) { dp[0].val = dp[0].cate = 0; for (int i = 1; i <= n; i++) { ld vl_min = 10000000000000000; int cn; for (int q = 1; q <= i; q++) { ld cur_vl = cost + dp[q - 1].val + (ld)(r[i] - l[q] + 1) * (ld)(r[i] - l[q] + 1); if (q != 1 and l[q] <= r[q - 1]) cur_vl -= (ld)(r[q - 1] - l[q] + 1) * (ld)(r[q - 1] - l[q] + 1); if (cur_vl < vl_min) { vl_min = cur_vl; cn = q; } } dp[i].val = vl_min; dp[i].cate = 1 + dp[cn - 1].cate; } } ll take_photos(int N, int M, int k, vector<int> R, vector<int> C) { n = N, m = M; for (int i = 0; i < n; i++) { l.push_back(min(R[i],C[i])); r.push_back(max(R[i],C[i])); } norma_intvs(); n = l.size(); vector<int> newl = {0}; for (auto it : l) newl.push_back(it); l = newl; vector<int> newr = {0}; for (auto it : r) newr.push_back(it); r = newr; ld st = (ll)1e6 * (ll)1e6; ld pas = 1ll << 39; while (pas >= eps) { if (st - pas >= 0) { solve(st - pas); if (dp[n].cate <= k) st -= pas; } pas /= 2.0d; } solve(st); ld ans = dp[n].val - st * (ld)k; if (ans - (ll)ans <= 0.5d) return (ll)ans; return (ll)ans + 1; }

Compilation message (stderr)

aliens.cpp:3:2: warning: #warning That's not FB, that's my FB [-Wcpp]
    3 | #warning That's not FB, that's my FB
      |  ^~~~~~~
aliens.cpp: In function 'void norma_intvs()':
aliens.cpp:25:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   25 |     for (int i = 0; i < l.size(); i++)
      |                     ~~^~~~~~~~~~
aliens.cpp: In function 'void solve(ld)':
aliens.cpp:69:32: warning: 'cn' may be used uninitialized in this function [-Wmaybe-uninitialized]
   69 |         dp[i].cate = 1 + dp[cn - 1].cate;
      |                             ~~~^~~
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