【集训DAY13】Travel【暴力】【动态规划】

思路：

我们直接暴力，枚举它上一个是哪个点，然后转移就好了

$code$

#include<iostream>
#include<cmath>
#include<cstdio>
#include<algorithm>
#define ll long long

using namespace std;

const ll MAXN = 1010;

ll n, m, f[MAXN * MAXN], g[MAXN * MAXN], tot;

struct node {
    
	ll x, y, t, val;
}a[MAXN * MAXN];

bool cmp(node x, node y) {
    
	return x.val<y.val;
} 

ll dis(ll x, ll y) {
    
	return abs(a[x].x - a[y].x) + abs(a[x].y - a[y].y);
}

int main() {
    
	scanf("%lld%lld", &n, &m);
	for(ll i = 1; i <= n; i ++)
		for(ll j = 1; j <= m; j ++) scanf("%lld", &a[(i - 1) * m + j].val);
	for(ll i = 1; i <= n; i ++)
		for(ll j = 1; j <= m; j ++) scanf("%lld", &a[(i - 1) * m + j].t);
	for(ll i = 1; i <= n; i ++)
		for(ll j = 1; j <= m; j ++) a[(i - 1) * m + j].x = i, a[(i - 1) * m + j].y = j;
	sort(a + 1, a + 1 + n * m, cmp);
	ll i = 1;
	while(a[i].val == 0 && a[i].t == 0) i ++;
	g[++ tot] = i, f[i] = a[i].t, i ++;
	while(a[i - 1].val == a[i].val && i <= n * m) {
    
		g[++ tot] = i, f[i] = a[i].t, i ++;
	}
	for(; i <= n * m; ) {
    
		ll j = i + 1;
		for(ll k = 1; k <= tot; k ++) f[i] = max(f[i], f[g[k]] + a[i].t + dis(g[k], i));
		while(a[j].val == a[i].val && j <= n * m) {
    
			for(ll k = 1; k <= tot; k ++) f[j] = max(f[j], f[g[k]] + a[j].t + dis(g[k], j));
			j ++;
		}
		j --;
		tot = 0;
		for(ll k = i; k <= j; k ++) g[++ tot] = k;
		i = j + 1;
	}
	ll ans = 0;
	for(ll i = 1; i <= n * m; i ++)  {
    
		ans = max(ans, f[i]);
	}
	printf("%lld", ans);
	return 0;
}