UVA - 11400 Lighting System Design

#include<cstdio>
#include<iostream>
#include<string.h>
#include<algorithm>
using namespace std;
const int maxn = 1000 + 5;
struct kk
{
    int v, k, c, l;
    bool operator < (const kk &p) const{
        return v < p.v;
    }
}vis[maxn];
int d[maxn];
int s[maxn];
int v[maxn];
int k[maxn];
int c[maxn];

int main()
{
    int n;
    while(scanf("%d", &n) == 1 &&n)
    {
        memset(vis,0,sizeof(vis));
        memset(d,0,sizeof(d));
        memset(s,0,sizeof(s));
        memset(v,0,sizeof(v));
        memset(k,0,sizeof(k));
        memset(c,0,sizeof(c));
        for(int i = 1; i <= n; ++i) scanf("%d%d%d%d", &vis[i].v, &vis[i].k, &vis[i].c, &vis[i].l);
        sort(vis+1, vis+n+1);
        for(int i = 1; i <= n; ++i)
        {
            v[i] = vis[i].v;
            k[i] = vis[i].k;
            c[i] = vis[i].c;
            s[i] = s[i-1] + vis[i].l;
        }
        for(int i = 1; i <= n; ++i) d[i] = (1<<30);
        for(int i = 1; i <= n; ++i)
            for(int j  = 0; j <= i; ++j)
                d[i] = min(d[j]+(s[i] - s[j]) * c[i] + k[i], d[i]);
        printf("%d\n", d
);
    }
}