Submission #117641

#	Time	Username	Problem	Language	Result	Execution time	Memory
117641		JohnTitor	Balloons (CEOI11_bal)	C++11	100 / 100	201 ms	13192 KiB

bal

#include <bits/stdc++.h>
using namespace std;
#define FOR(i, j, k) for(int i=(j); i<=(k); i++)
#define FFOR(i, j, k) for(int i=(j); i<(k); i++)
#define DFOR(i, j, k) for(int i=(j); i>=(k); i--)
#define bug(x) cerr<<#x<<" = "<<(x)<<'\n'
#define pb push_back
#define mp make_pair
#define setbit(s, i) (s|=(1LL<<(i)))
#define bit(s, i) (((s)>>(i))&1LL)
#define mask(i) ((1LL<<(i)))
#define builtin_popcount __builtin_popcountll
using ll=long long;
using ld=long double;
template <typename T> inline void read(T &x){
    char c;
    bool nega=0;
    while((!isdigit(c=getchar()))&&(c!='-'));
    if(c=='-'){
        nega=1;
        c=getchar();
    }
    x=c-48;
    while(isdigit(c=getchar())) x=x*10+c-48;
    if(nega) x=-x;
}
template <typename T> inline void writep(T x){
    if(x>9) writep(x/10);
    putchar(x%10+48);
}
template <typename T> inline void write(T x){
    if(x<0){
        putchar('-');
        x=-x;
    }
    writep(x);
}
template <typename T> inline void writeln(T x){
    write(x);
    putchar('\n');
}
#define taskname "Balloons"
#define sqr(x) ((x)*(x))
int n;
vector <pair <ld, ld>> good;
ld get_r(ld x, ld x0, ld r0){
    return sqr(x-x0)/(r0*4);
}
ld x[200001];
ld r[200001];
vector <pair <ld, ld>> s;
int main(){
    #ifdef Uiharu
        if(fopen(taskname".in", "r"))
            freopen(taskname".in", "r", stdin);
    #endif // Uiharu
    read(n);
    FOR(i, 1, n){
        read(x[i]);
        read(r[i]);
        while(!s.empty()){
            r[i]=min(r[i], get_r(x[i], s.back().first, s.back().second));
            if(r[i]>=s.back().second) s.pop_back();
            else break;
        }
        s.pb(mp(x[i], r[i]));
        cout<<setprecision(10)<<fixed<<r[i]<<'\n';
    }
}

• Subtask 1: 10 / 10
• Subtask 2: 10 / 10
• Subtask 3: 10 / 10
• Subtask 4: 10 / 10
• Subtask 5: 10 / 10
• Subtask 6: 10 / 10
• Subtask 7: 10 / 10
• Subtask 8: 10 / 10
• Subtask 9: 10 / 10
• Subtask 10: 10 / 10