Submission #549708

#TimeUsernameProblemLanguageResultExecution timeMemory
549708cpp219Let's Win the Election (JOI22_ho_t3)C++17
72 / 100
45 ms3812 KiB
#include<bits/stdc++.h> #define ll long long #define ld long double #define fs first #define sc second #define debug(y) cout<<y,exit(0) using namespace std; typedef pair<ll,ll> LL; const ll N = 500 + 9; const ll inf = 1e18 + 7; ld ans = inf*1.0,dp[N][N]; ll n,k,collab; LL a[N]; bool lf(LL x,LL y){ return x.sc < y.sc; } ld cal(ll mid){ for (ll i = 1;i <= n;i++) for (ll j = 0;j <= i;j++){ dp[i][j] = inf; if (i - j - 1 >= mid) dp[i][j] = dp[i - 1][j]; else dp[i][j] = dp[i - 1][j] + (ld)a[i].sc/((ld)i - j); if (j) dp[i][j] = min(dp[i][j],dp[i - 1][j - 1] + (ld)a[i].fs/((ld)mid + 1)); } ld tmp = inf; for (ll i = k - mid;i <= n;i++) if (n - i >= mid) tmp = min(tmp,dp[n][i]); return tmp; } int main(){ ios_base::sync_with_stdio(NULL); cin.tie(0); cout.tie(0); #define task "test" if (fopen(task".inp","r")){ freopen(task".inp","r",stdin); //freopen(task".out","w",stdout); } cin>>n>>k; for (ll i = 1;i <= n;i++){ cin>>a[i].fs>>a[i].sc; collab += (a[i].sc != -1); if (a[i].sc == -1) a[i].sc = inf; } sort(a + 1,a + n + 1,lf); ll l = 0,h = min(k,collab); while(l <= h){ ll mid = (l + h)/2; if (cal(mid) < cal(mid + 1)) h = mid - 1; else l = mid + 1; } //debug(h); cout<<fixed<<setprecision(6)<<cal(l); } /// be confident

Compilation message (stderr)

Main.cpp: In function 'int main()':
Main.cpp:38:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   38 |         freopen(task".inp","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
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