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[JSOI2008]Blue Mary开公司

 1 year ago
source link: https://www.shuizilong.com/house/archives/jsoi2008blue-mary%e5%bc%80%e5%85%ac%e5%8f%b8/
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July 29, 2022

这个 可真棒。。。

#define ll double
struct Line {
mutable ll k, b, p;
Line (ll k = 0, ll b = 0):k(k),b(b){
p = 0;
}
ll y(ll x) const {return k*x + b;}
bool operator<(const Line& o) const { return k < o.k; }
bool operator<(ll x) const { return p < x; }
};
struct LineContainer : multiset<Line,less<>> {
const ll inf = 1/.0;
ll div(ll a, ll b) {
return a / b;
}
bool isect(iterator x, iterator y) {
if (y == end()) return x->p = inf, 0;
if (x->k == y->k) x->p = x->b > y->b ? inf : -inf;
else x->p = div(y->b - x->b, x->k - y->k);
return x->p >= y->p;
}
void add(ll k, ll b) {
add(Line(k,b));
}
void add(Line t) {
auto z = insert(t), y = z++, x = y;
while (isect(y, z)) z = erase(z);
if (x != begin() && isect(--x, y)) isect(x, y = erase(y));
while ((y = x) != begin() && (--x)->p >= y->p)
isect(x, erase(y));
}
ll query(ll x) {
assert(!empty());
auto& l = *lower_bound(x);
return l.y(x);
}
} H;
int main(){
#ifndef ONLINE_JUDGE
freopen("in.txt", "r", stdin);
// freopen("out.txt", "w", stdout);
#endif
H.add(0, 0); char cmd[10]; DB k, b, x; Rush {
RS(cmd);
if (cmd[0] == 'P') {
RF(b, k);
H.add(k, b);
} else {
RF(x);
OT(LL(H.query(x-1)/100));
}
}
}

Posted by xiaodao
Category: 日常

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