C. Anton and Making Potions 贪心 + 二分
http://codeforces.com/contest/734/problem/C
因为有两种操作,那么可以这样考虑,
1、都不执行,就是开始的答案是n * x
2、先执行第一个操作,然后就会得到一个time和left。就是你会得到一个新的用时,和一个剩下的魔法数,然后在第二个操作数中二分,二分第一个小于等于left的值,意思就是我现在还拥有left点魔法,能够买最多多少个技能的意思。
就是,看着样例一
得到的会是
time : 40s 80s 60s
left : 79 89 59
3、同理,可以先执行第二种操作,再执行第一种操作。这就需要我们把第一种操作的东西排序了。这里用到了贪心,排序第一是按照需要的魔法数来排,第二是按照a[i]从大到小。(这里又fst,唉,一个符号)。因为这样是最优的。
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <cmath>
#include <algorithm>
#define IOS ios::sync_with_stdio(false)
using namespace std;
#define inf (0x3f3f3f3f)
typedef long long int LL; #include <iostream>
#include <sstream>
#include <vector>
#include <set>
#include <map>
#include <queue>
#include <string>
const int maxn = 1e6 + ;
LL a[maxn];
LL b[maxn];
struct node {
LL c, d;
node(LL cc, LL dd) : c(cc), d(dd) {}
node() {}
bool operator < (const struct node & rhs) const {
return d < rhs.d;
}
}arr[maxn];
struct tt {
LL tim, lef;
LL id;
}ff[maxn];
struct bug {
LL a, b;
int id;
bug() {}
bug(LL aa, LL bb) : a(aa), b(bb) {}
bool operator < (const struct bug & rhs) const {
if (b != rhs.b) return b < rhs.b;
else return a > rhs.a; //这个按大排
}
}gg[maxn];
void work() {
LL n, m, k;
cin >> n >> m >> k;
LL x, limit;
cin >> x >> limit;
for (int i = ; i <= m; ++i) {
cin >> a[i];
gg[i].a = a[i];
}
for (int i = ; i <= m; ++i) {
cin >> b[i];
gg[i].b = b[i];
gg[i].id = i;
}
sort(gg + , gg + + m);
for (int i = ; i <= k; ++i) {
cin >> arr[i].c;
}
for (int i = ; i <= k; ++i) {
cin >> arr[i].d;
}
LL ans = n * x;
int lenff = ;
// cout << x << endl;
for (int i = ; i <= m; ++i) {
if (b[i] > limit) continue;
++lenff;
ff[lenff].tim = n * a[i];
ff[lenff].lef = limit - b[i];
ff[lenff].id = i;
}
// for (int i = 1; i <= lenff; ++i) {
// cout << ff[i].tim << " " << ff[i].lef << endl;
// }
for (int i = ; i <= lenff; ++i) {
ans = min(ans, ff[i].tim);
if (ff[i].lef < arr[].d) continue;
int pos = upper_bound(arr + , arr + + k, node(0L, ff[i].lef)) - arr;
pos--;
LL t = ff[i].tim - arr[pos].c * a[ff[i].id];
ans = min(ans, t);
}
lenff = ;
for (int i = ; i <= k; ++i) {
if (arr[i].d > limit) continue;
++lenff;
ff[lenff].lef = limit - arr[i].d;
ff[lenff].tim = (n - arr[i].c) * x;
ff[lenff].id = n - arr[i].c;
}
for (int i = ; i <= lenff; ++i) {
ans = min(ans, ff[i].tim);
if (ff[i].lef < gg[].b) continue;
int pos = upper_bound(gg + , gg + + m, bug(, ff[i].lef)) - gg;
pos--;
LL t = ff[i].id * a[gg[pos].id];
ans = min(ans, t);
}
cout << ans << endl;
} int main() {
#ifdef local
freopen("data.txt","r",stdin);
#endif
IOS;
work();
return ;
}
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