Submission #528064

#	Time	Username	Problem	Language	Result	Execution time	Memory
528064		amukkalir	Let's Win the Election (JOI22_ho_t3)	C++17	56 / 100	2643 ms	990536 KiB

Main

#include <bits/stdc++.h> 
using namespace std; 
typedef long long ll; 
 
#define prn printf
#define scn scanf
#define pii pair<int,int> 
#define fi first 
#define se second 
#define mp make_pair
 
const int nax = 500;  
const int inf = 1e9; 
 
int n,k; 
double memo[nax+5][nax+5][nax+5]; 
vector<pii> a; 
 
// double dp(int idx, int col, int rem) {
//     if(rem == 0) return 0; 
//     if(idx == n) return inf; 
 
//     double &ret = memo[idx][col][rem]; 
//     if(ret!=0) return ret; 
 
//     ret = dp(idx+1, col, rem); // ga ambil 
//     if(a[idx].fi != inf) ret = min(ret, (double)a[idx].fi/col + dp(idx+1, col+1, rem-1)); 
//     else ret = min(ret, (double)a[idx].se/col + dp(idx+1,col,rem-1)); 
 
//    // cerr << idx << " " << col << " " << rem << " = " << ret << endl; 
//     return ret; 
// }
 
double dp (int idx, int col, int vote, int tcol) {
    if(col + vote == 0) return 0; 
    if(idx==n) return inf; 
 
    double &ret = memo[idx][col][vote]; 
    if(ret!=0) return ret; 
 
    ret = dp(idx+1, col, vote, tcol); 
    
    if(col>0 && a[idx].fi != inf) ret = min(ret, (double)a[idx].fi/(tcol-col+1) + dp(idx+1, col-1, vote, tcol)); //consider jd collaborator 
    if(vote>0) ret = min(ret, (double)a[idx].se/(tcol+1) + dp(idx+1,col,vote-1, tcol)); 
    //cerr << idx << " " << col <<  " " << vote << endl; 
    return ret; 
}

double get(ll c) {
    if(c < 0 || c > k) return inf; 

    for(int i=0;i<n;i++) for(int j=0;j<n; j++) for(int k=0; k<n; k++) memo[i][j][k] = 0; 
    return dp(0, c, k-c, c); 
}
 
signed main () {
    scn("%d%d", &n, &k); 
 
    a.assign(n,{0,0}); 
    for(int i=0; i<n; i++) {
        scn("%d%d", &a[i].se, &a[i].fi);
        if(a[i].fi == -1) a[i].fi = inf; 
    }
 
    sort(a.begin(), a.end()); 
    
    //for(int i=0; i<n; i++) //cerr << a[i].fi << " " << a[i].se << endl; 
 
    double ans = inf; 
    int lo = 0, hi = k; 

    while(lo < hi) {
        int mid = (lo+hi)>>1; 
        if(get(mid) < get(mid+1)) hi = mid; 
        else lo = mid+1; 
    }
    //cerr << " :: " << lo << " " << hi << '\n';
    ans = get(lo); 
    prn("%f", ans); 
}
 
/*
125.000.000
log(500) = 9 
 
*/

Compilation message (stderr)

Main.cpp: In function 'int main()':
Main.cpp:57:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   57 |     scn("%d%d", &n, &k);
      |        ^
Main.cpp:61:12: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   61 |         scn("%d%d", &a[i].se, &a[i].fi);
      |            ^

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