Submission #703488

#	Time	Username	Problem	Language	Result	Execution time	Memory
703488		niter	Let's Win the Election (JOI22_ho_t3)	C++14	5 / 100	12 ms	212 KiB

Main

#include <bits/stdc++.h>
#define loop(i,a,b) for(int i=a;i<b;i++)
#define pii pair<int,int>
#define ff first
#define ss second
#define mp make_pair
#define pb push_back
#define STL(i, x) for(auto &i:x) cout << i << " "; cout << "\n";
#define iNf 2147483647
using namespace std;

ostream& operator<<(ostream &os, pii XXX){
    cout << "[" << XXX.ff << ", " << XXX.ss << "]";
}
void db(){
    cout << "\n";
}
template<class T, class ...U>
void db(T XXX, U ...YYY){
    cout << XXX;  db(YYY...);
}

bool cmp(pii &XXX, pii &YYY){
    return ((XXX.ff - YYY.ff) / 2 > (XXX.ss > YYY.ss));
}
bool cmp_ff(pii &XXX, pii &YYY){
    return (XXX.ff != YYY.ff) ? (XXX.ff < YYY.ff) : (XXX.ss < YYY.ss);
}
bool cmp_ss(pii &XXX, pii &YYY){
    return (XXX.ss != YYY.ss) ? (XXX.ss < YYY.ss) : (XXX.ff < YYY.ff);
}

int main(){
    int n, k;
    cin >> n >> k;
    int a[505], b[505];
    vector<pii> org(n), dp;
    loop(i,0,n){
        cin >> a[i] >> b[i];
        if(b[i] == -1)
            b[i] = iNf;
        org[i] = mp(a[i], b[i]);
    }
    long double ans = (1e300), tmp_ans;
    int tmp_get, tmp_now;
    sort(org.begin(), org.end());
//    STL(i, org);
    loop(i,0,k+1){
        dp = org;
        tmp_ans = 0;
        tmp_get = 0;
        tmp_now = 1;
        loop(j,0,i){
            if(dp[j].ss == iNf) break;
            tmp_ans += (long double)dp[j].ss / tmp_now;
            dp[j].ff = iNf;
            dp[j].ss = iNf;
            tmp_get++;
            tmp_now++;
        }
//        STL(i, dp);
//        db(tmp_ans);
        sort(dp.begin(), dp.end(), cmp_ff);
        loop(j,0,n){
            if(tmp_get == k){
                ans = min(ans, tmp_ans);
                break;
            }
            tmp_ans += (long double)dp[j].ff / tmp_now;
            tmp_get++;
        }
        if(tmp_get == k)
            ans = min(ans, tmp_ans);
    }
    cout << fixed << setprecision(10) << ans << "\n";
    return 0;
}
/*
3
3
1 5
2 3
4 5
*/
/*
2 2
9 10
5 9
*/

Compilation message (stderr)

Main.cpp: In function 'std::ostream& operator<<(std::ostream&, std::pair<int, int>)':
Main.cpp:14:1: warning: no return statement in function returning non-void [-Wreturn-type]
   14 | }
      | ^

• Subtask 1: 5 / 5
• Subtask 2: 0 / 5
• Subtask 3: 0 / 11
• Subtask 4: 0 / 12
• Subtask 5: 0 / 33
• Subtask 6: 0 / 11
• Subtask 7: 0 / 23