제출 #787292

#제출 시각아이디문제언어결과실행 시간메모리
787292LuoBoAliens (IOI16_aliens)C++14
25 / 100
143 ms4352 KiB
#include "aliens.h"
#include <bits/stdc++.h>
using namespace std;
 
const int MAXN=10010;
struct node {
	int x, y;
} t[MAXN], p[MAXN];
long long f[MAXN][MAXN];

bool cmp(node x, node y) { return x.x==y.x ? x.y<y.y : x.x<y.x ; }
long long sq(long long x) { return x*x; }
bool tan_judge(node x, node y, node z) { return ( (double)( ( z.y-y.y ) / ( z.x-y.x ) ) > (double)( ( y.y-x.y ) / ( y.x-x.x ) ) ) ? true : false ; }

long long take_photos(int n, int m, int k, vector<int> r, vector<int> c) {
	
	for (int i=0; i<n; i++) {
		t[i].x=r[i]; t[i].y=c[i];
		if ( r[i]>c[i] ) swap(t[i].x,t[i].y); 
	}
	sort(t, t+n, cmp);
	
	int right=-1, tt=0;
	p[0].x=-1; p[0].y=-1;
	for (int i=0; i<n; i++) {
		if ( t[i].y<=right ) continue;
		right=t[i].y; p[++tt]=t[i];
	}
	n=tt;
	
//	tt=0;
//	for (int i=0; i<n; i++) {
//		if ( tt<=2 ) { t[++tt]=p[i]; continue; }
//		if ( tan_judge(p[i], t[tt], t[tt-1]) ) t[++tt]=p[i];
//		else {
//			printf("bug! \n");
//			while ( tt>2 && !tan_judge(p[i], t[tt], t[tt-1]) ) tt--;
//			t[++tt]=p[i];
//		}
//		
//	}

//	for (int i=0;i<n;i++) printf("%d %d\n",t[i].x,t[i].y);

	n=tt;
	long long ans=1e10;
	for (int i=0;i<=n;i++)
		for (int opt=0;opt<=k;opt++) f[i][opt]=1e10;
	f[0][0]=0;
	
	for (int i=1; i<=n; i++) {
		for (int opt=1; opt<=k; opt++) {
			for (int j=0; j<i; j++) {
				f[i][opt]=min(f[i][opt], f[j][opt-1] + sq( p[i].y-p[j+1].x+1 ) - sq( max(0, p[j].y-p[j+1].x+1) ) );
			}
		}
	}
	
	for (int opt=1;opt<=k;opt++) ans=min(ans,f[n][opt]);
	return ans;
	
}

/*
5 7 2
0 3
4 4
4 6
4 5
4 6
*/
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