Submission #877991

#	Time	Username	Problem	Language	Result	Execution time	Memory
877991		fanwen	Sure Bet (CEOI17_sure)	C++17	100 / 100	84 ms	3828 KiB

sure

#pragma GCC optimize("O2")
#pragma GCC target("avx,avx2,fma")
#include <bits/stdc++.h>
#define fi first
#define se second
#define ll long long
#define mp make_pair
#define ii pair<int,int>
#define MASK(i) (1LL<<(i))
#define BIT(x,i) (((x)>>(i))&1)
#define all(x) (x).begin(),(x).end()

using namespace std;
const int maxn = 1e5 + 5;
const int    N = 1e3 + 1;
const int  mod = 1e9 + 7;

template <class X,class Y>bool maximize(X &a,Y b) {
        if(a<b)return a=b,true;
        return false;}

template <class X,class Y>bool minimize(X &a,Y b) {
        if(a>b)return a=b,true;
        return false;}

#define TASK ""
void file() {
        freopen(TASK ".inp", "r", stdin);
        freopen(TASK ".out", "w", stdout);}
#define fasterIO ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
#define ld long double
int n,i,j;
ld a[maxn],b[maxn];
int na,nb;
ld A,B;
ld Max = 0.000;
int main() {
        // file();
        fasterIO;
        cin >>n;
        for(i=1;i<=n;i++) cin>>a[i]>>b[i],a[i]--,b[i]--;
        sort(a+1,a+n+1,greater<ld>());
        sort(b+1,b+n+1,greater<ld>());
        for(i=1;i<=n;i++){
                A += a[i] , ++na;
                while(nb < n && min(A-nb,B-na) < min(A - nb -1, B + b[nb+1] - na)){
                        B += b[nb+1];
                        nb++;
                }
                maximize(Max,min(A-nb,B-na));
        }
        cout << fixed << setprecision(4) << Max << '\n';
        return 0;
}

Compilation message (stderr)

sure.cpp: In function 'void file()':
sure.cpp:28:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   28 |         freopen(TASK ".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
sure.cpp:29:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   29 |         freopen(TASK ".out", "w", stdout);}
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 20 / 20
• Subtask 2: 40 / 40
• Subtask 3: 40 / 40