Submission #942047

#TimeUsernameProblemLanguageResultExecution timeMemory
942047KG07Aliens (IOI16_aliens)C++14
41 / 100
2037 ms5456 KiB
#include "aliens.h" #include <bits/stdc++.h> using namespace std; long long take_photos(int n, int m, int k, vector<int> r, vector<int> c) { priority_queue<pair<int, int>> q; for(int i = 0; i < n; i++){ if(r[i] > c[i])q.push(make_pair(-c[i], r[i])); else q.push(make_pair(-r[i], c[i])); } vector<pair<int, int>> a; a.push_back(make_pair(-q.top().first, q.top().second)); q.pop(); while(!q.empty()){ if(-q.top().first > a[a.size()-1].first && q.top().second > a[a.size()-1].second)a.push_back(make_pair(-q.top().first, q.top().second)); q.pop(); } long long L = 0LL, R = 1LL * m * m; while(true){ long long C = (L+R+1)/2; vector<long long> b, d, x, y, z; stack<long long> s; b.push_back(0LL); d.push_back(0LL); x.push_back(0LL); y.push_back(-2LL*(a[0].first-1)); z.push_back(1LL*(a[0].first-1)*(a[0].first-1)); //cout << b[0] << " " << x[0]-C << " " << y[0] << " " << z[0] << "\n"; //cout << L << " " << C << " " << R << "\n"; for(int i = 0; i < a.size(); i++){ b.push_back(1000000LL*m*m); d.push_back(0LL); x.push_back(C+1LL*a[i].second*a[i].second); y.push_back(-2LL*(a[i+1].first-1)); z.push_back(1LL*(a[i+1].first-1)*(a[i+1].first-1)-max(0LL, 1LL*(a[i].second-a[i+1].first+1))*max(0LL, 1LL*(a[i].second-a[i+1].first+1))); for(int j = 0; j <= i; j++){ if(b[j]+x[i+1]+y[j]*a[i].second+z[j] <= b[i+1])d[i+1] = d[j]+1; b[i+1] = min(b[i+1], b[j]+x[i+1]+y[j]*a[i].second+z[j]); } //cout << b[i+1] << " " << x[i+1] << " " << y[i+1] << " " << z[i+1] << " " << d[i+1] << "\n"; } if(L == R)return b[a.size()]-C*min(1LL*k, d[a.size()]); if(d[a.size()] < k)R = (L+R)/2; else L = C; } return 0; }

Compilation message (stderr)

aliens.cpp: In function 'long long int take_photos(int, int, int, std::vector<int>, std::vector<int>)':
aliens.cpp:30:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int>, std::allocator<std::pair<int, int> > >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   30 |         for(int i = 0; i < a.size(); i++){
      |                        ~~^~~~~~~~~~
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