Submission #148753

#	Time	Username	Problem	Language	Result	Execution time	Memory
148753		还没编好 (#200)	Crosses on the Grid (FXCUP4_cross)	C++17	0 / 100	5 ms	384 KiB

cross

#include "cross.h"
#include <bits/stdc++.h>
using namespace std;
#define rep(i,a,n) for (int i=a;i<n;i++)
#define per(i,a,n) for (int i=n-1;i>=a;i--)
#define pb push_back
#define mp make_pair
#define all(x) (x).begin(),(x).end()
#define fi first
#define se second
#define SZ(x) ((int)(x).size())
typedef vector<int> VI;
typedef long long ll;
typedef pair<int,int> PII;
const ll mod=1000000007;
ll powmod(ll a,ll b) {ll res=1;a%=mod; assert(b>=0); for(;b;b>>=1){if(b&1)res=res*a%mod;a=a*a%mod;}return res;}
ll gcd(ll a,ll b) { return b?gcd(b,a%b):a;}
// head

const int N=201000;
int n;
pair<int,int> p[N];

ll sqr(ll x) { return x*x; }

long long SelectCross(int K, std::vector<int> I, std::vector<int> O) {
	n=SZ(I);
	for (int i=0;i<n;i++) p[i]=mp(O[i],I[i]);
	sort(p,p+n); reverse(p,p+n);
	priority_queue<int,vector<int>,greater<int>> q;
	ll ans=0;
	for (int i=0;i<n;i++) {
		while (q.size()>K-1) q.pop();
		if (q.size()==K-1) {
			ans=max(ans,sqr(p[i].first)-sqr(
				max(p[i].first-min(p[i].second,(K==1?0:q.top())),0)));
		}
		q.push(p[i].second);
	}
	return ans;
}

Compilation message (stderr)

cross.cpp: In function 'long long int SelectCross(int, std::vector<int>, std::vector<int>)':
cross.cpp:33:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   while (q.size()>K-1) q.pop();
          ~~~~~~~~^~~~
cross.cpp:34:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   if (q.size()==K-1) {
       ~~~~~~~~^~~~~

• Subtask 1: 0 / 8
• Subtask 2: 0 / 55
• Subtask 3: 0 / 37