Submission #546547

#	Time	Username	Problem	Language	Result	Execution time	Memory
546547		CPSC	Aliens (IOI16_aliens)	C++14	12 / 100	154 ms	348 KiB

aliens

#include <cstdio>
#include <algorithm>
#include <vector>
#include <cassert>
#include <iostream>
#include <map>
using namespace std;
 
typedef long long llong;
const llong linf = 1e13;
const int inf = 1e9;
 
llong sqr(int x) {
    return 1ll * x * x;
}
 
llong take_photos(int n, int /* m */, int k, std::vector<int> row, std::vector<int> column) {
    map<int, int> M;
    for (int i = 0; i < n; i++) {
        int x, y;
        x = row[i];
        y = column[i];
        if (x < y)
            swap(x, y);
        if (!M.count(x))
            M[x] = x;
        M[x] = min(M[x], y);
    }
    vector<int> L, R;
    for (auto pr : M) {
        if (!L.empty() && L.back() >= pr.second)
            L.pop_back(), R.pop_back();
        R.push_back(pr.first);
        L.push_back(pr.second);
    }
    n = L.size();
    assert(is_sorted(R.begin(), R.end()));
    vector<llong> D;
    vector<llong> nD;
    D.assign(n + 1, linf);
    D[0] = 0;
    llong ans = linf;
    for (int i = 0; i < k; i++) {
        nD.assign(n + 1, linf);
        for (int j = 0; j < n; j++) {
            for (int nj = j + 1; nj <= n; nj++) {
                int r1 = j ? R[j - 1] : -1;
                int r2 = R[nj - 1];
                int l = L[j];
                llong nv = D[j] + sqr(r2 - l + 1) - sqr(max(0, r1 - l + 1));
                if (nD[nj] > nv)
                    nD[nj] = nv;
            }
        }
        D.swap(nD);
        ans = min(ans, D.back());
    }
    return ans;
}
 
// BEGIN CUT
/*
int main() {
    int n, m, k;
    scanf("%d %d %d", &n, &m, &k);
    std::vector<int> row(n), column(n);
    for (int i = 0; i < n; i++) {
        scanf("%d %d", &row[i], &column[i]);
    }
    long long answer = take_photos(n, m, k, row, column);
    puts("098d134608c94f7413faac591054ee35");
    printf("%lld\n", answer);
    return 0;
}
*/
// END CUT

• Subtask 1: 0 / 4
• Subtask 2: 12 / 12
• Subtask 3: 0 / 9
• Subtask 4: 0 / 16
• Subtask 5: 0 / 19
• Subtask 6: 0 / 40