Submission #432937

#	Time	Username	Problem	Language	Result	Execution time	Memory
432937		yuto1115	Aliens (IOI16_aliens)	C++17	25 / 100	2059 ms	6988 KiB

aliens

#include "aliens.h"
#include <bits/stdc++.h>
#define rep(i, n) for(ll i = 0; i < ll(n); i++)
#define rep2(i, s, n) for(ll i = ll(s); i < ll(n); i++)
#define rrep(i, n) for(ll i = ll(n)-1; i >= 0; i--)
#define all(a) a.begin(),a.end()
#define rall(a) a.rbegin(),a.rend()
#define pb push_back
#define eb emplace_back
using namespace std;
using ll = long long;
using P = pair<int, int>;
using vi = vector<int>;
using vvi = vector<vi>;
using vl = vector<ll>;
using vvl = vector<vl>;
using vp = vector<P>;
using vvp = vector<vp>;
using vb = vector<bool>;
using vvb = vector<vb>;
using vs = vector<string>;

template<class T>
bool chmin(T &a, T b) {
    if (a > b) {
        a = b;
        return true;
    }
    return false;
}

template<class T>
bool chmax(T &a, T b) {
    if (a < b) {
        a = b;
        return true;
    }
    return false;
}

const int inf = 1001001001;
const ll linf = 1001001001001001001;

ll take_photos(int n, int m, int k, vi r, vi c) {
    vp v;
    rep(i, n) {
        if (r[i] <= c[i]) v.eb(r[i], c[i] + 1);
        else v.eb(c[i], r[i] + 1);
    }
    sort(all(v));
    vi ls;
    int mx = 0;
    rep(i, n) if (chmax(mx, v[i].second)) ls.pb(i);
    int sz = ls.size();
    vi s(sz), t(sz);
    rep(i, sz) {
        s[i] = v[ls[i]].first;
        t[i] = v[ls[i]].second;
    }
    vvl dp(sz + 1, vl(k + 1, linf));
    dp[0][0] = 0;
    rep(i, sz) rep(j, k) {
            ll now = dp[i][j];
            if (now == linf) continue;
            rep2(ni, i, sz) {
                ll wid = t[ni] - s[i];
                ll lap = max(0LL, (i ? t[i - 1] : 0LL) - s[i]);
                ll add = wid * wid - lap * lap;
                chmin(dp[ni + 1][j + 1], now + add);
            }
        }
    ll ans = linf;
    rep2(i, 1, k + 1) chmin(ans, dp[sz][i]);
    return ans;
}

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