Educational Codeforces Round 109 (Rated for Div. 2)- D.Armchairs -01背包泛化物品
Posted Chivas_/Regal
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题目:
思路:
其实是赛后才发现。。
这不就一个裸的泛化物品01背包吗?
发现空位置比人要多
我们要所有人都被利用起来
说明决定塞不塞入就是当前空位要不要放进人堆里面
所以
我们将人数视作背包容量,空位视作物品,
每个物品的价值是这个空位和要换过来的人的距离
板来!
代码:
/*
________ _ ________ _
/ ______| | | | __ | | |
/ / | | | |__| | | |
| | | |___ _ _ _ ___ _ _____ | ___| ______ _____ ___ _ | |
| | | __ \\ |_| | | | | | _\\| | | ____| | |\\ \\ | __ | | _ | | _\\| | | |
| | | | \\ | _ | | | | | | \\ | | \\___ | | \\ \\ | |_/ _| | |_| | | | \\ | | |
\\ \\______ | | | | | | \\ |_| / | |_/ | ___/ | | | \\ \\ | /_ \\__ | | |_/ | | |
Author : \\________| |_| |_| |_| \\___/ |___/|_| |_____| _________|__| \\__\\ |______| | | |___/|_| |_|
____| |
\\_____/
*/
#include <unordered_map>
#include <algorithm>
#include <iostream>
#include <cstring>
#include <utility>
#include <string>
#include <vector>
#include <cstdio>
#include <stack>
#include <queue>
#include <cmath>
#include <map>
#include <set>
#define G 10.0
#define LNF 1e18
#define EPS 1e-6
#define PI acos(-1.0)
#define INF 0x7FFFFFFF
#define ll long long
#define ull unsigned long long
#define LOWBIT(x) ((x) & (-x))
#define LOWBD(a, x) lower_bound(a.begin(), a.end(), x) - a.begin()
#define UPPBD(a, x) upper_bound(a.begin(), a.end(), x) - a.begin()
#define TEST(a) cout << "---------" << a << "---------" << '\\n'
#define CHIVAS int main()
#define _REGAL exit(0)
#define SP system("pause")
#define IOS ios::sync_with_stdio(false)
#define map unordered_map
#define _int(a) int a; cin >> a
#define _ll(a) ll a; cin >> a
#define _char(a) char a; cin >> a
#define _string(a) string a; cin >> a
#define _vectorInt(a, n) vector<int>a(n); cin >> a
#define _vectorLL(a, b) vector<ll>a(n); cin >> a
#define PB(x) push_back(x)
#define ALL(a) a.begin(),a.end()
#define MEM(a, b) memset(a, b, sizeof(a))
#define EACH_CASE(cass) for (cin >> cass; cass; cass--)
#define LS l, mid, rt << 1
#define RS mid + 1, r, rt << 1 | 1
#define GETMID (l + r) >> 1
using namespace std;
template<typename T> inline void Read(T &x){T f = 1; x = 0;char s = getchar();while(s < '0' || s > '9'){if(s == '-') f = -1; s = getchar();}while('0'<=s&&s<='9'){x=(x<<3)+(x<<1)+(s^48);s=getchar();}x*=f;}
template<typename T> inline T MAX(T a, T b){return a > b? a : b;}
template<typename T> inline T MIN(T a, T b){return a > b? b : a;}
template<typename T> inline void SWAP(T &a, T &b){T tp = a; a = b; b = tp;}
template<typename T> inline T GCD(T a, T b){return b > 0? GCD(b, a % b) : a;}
template<typename T> inline void ADD_TO_VEC_int(T &n, vector<T> &vec){vec.clear(); cin >> n; for(int i = 0; i < n; i ++){T x; cin >> x, vec.PB(x);}}
template<typename T> inline pair<T, T> MaxInVector_ll(vector<T> vec){T MaxVal = -LNF, MaxId = 0;for(int i = 0; i < (int)vec.size(); i ++) if(MaxVal < vec[i]) MaxVal = vec[i], MaxId = i; return {MaxVal, MaxId};}
template<typename T> inline pair<T, T> MinInVector_ll(vector<T> vec){T MinVal = LNF, MinId = 0;for(int i = 0; i < (int)vec.size(); i ++) if(MinVal > vec[i]) MinVal = vec[i], MinId = i; return {MinVal, MinId};}
template<typename T> inline pair<T, T> MaxInVector_int(vector<T> vec){T MaxVal = -INF, MaxId = 0;for(int i = 0; i < (int)vec.size(); i ++) if(MaxVal < vec[i]) MaxVal = vec[i], MaxId = i; return {MaxVal, MaxId};}
template<typename T> inline pair<T, T> MinInVector_int(vector<T> vec){T MinVal = INF, MinId = 0;for(int i = 0; i < (int)vec.size(); i ++) if(MinVal > vec[i]) MinVal = vec[i], MinId = i; return {MinVal, MinId};}
template<typename T> inline pair<map<T, T>, vector<T> > DIV(T n){T nn = n;map<T, T> cnt;vector<T> div;for(ll i = 2; i * i <= nn; i ++){while(n % i == 0){if(!cnt[i]) div.push_back(i);cnt[i] ++;n /= i;}}if(n != 1){if(!cnt[n]) div.push_back(n);cnt[n] ++;n /= n;}return {cnt, div};}
template<typename T> vector<T>& operator-- (vector<T> &v){for (auto& i : v) --i; return v;}
template<typename T> vector<T>& operator++ (vector<T> &v){for (auto& i : v) ++i; return v;}
template<typename T> istream& operator>>(istream& is, vector<T> &v){for (auto& i : v) is >> i; return is;}
template<typename T> ostream& operator<<(ostream& os, vector<T> v){for (auto& i : v) os << i << ' '; return os;}
inline void solve(){
_int(n); _vectorInt(a, n);
vector<int> pp, blk;
pp.push_back(0), blk.push_back(0);
for(int i = 0; i < n; i ++){
if(a[i] == 1) pp.push_back(i);
else blk.push_back(i);
}
ll dp[pp.size() + 5];//容量
for(int i = 0; i < pp.size() + 5; i ++) dp[i] = INF;
dp[0] = 0;
for(int i = 1; i < blk.size(); i ++){//枚举物品
for(int j = (int)pp.size() - 1; j >= 1; j --){//枚举容量
dp[j] = MIN(dp[j], dp[j - 1] + abs(blk[i] - pp[j]));
}
}cout << dp[pp.size() - 1] << endl;
}
CHIVAS{IOS;
solve();
_REGAL;
}
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