[HDOJ5461]Largest Point

  1 #include <cstdio>
  2 #include <cstring>
  3 #include <algorithm>
  4 #include <cmath>
  5 using namespace std;
  6 
  7 typedef long long LL;
  8 const int INF = 0x3f3f3f3f;
  9 const int maxn = 5000000+100;
 10 
 11 int t[maxn];
 12 int n;
 13 int a,b;
 14 
 15 int main() {
 16     int T;
 17     scanf("%d",&T);
 18     for(int tt = 1;tt <= T;++tt) {
 19         scanf("%d %d %d",&n,&a,&b);
 20         for(int i = 1;i <= n;++i) {
 21             scanf("%d",&t[i]);
 22         }
 23         int maxx1 = 0,maxx2 = 0;
 24         int mn1 = INF,mn2 = INF;
 25         int mm1 = -INF,mm2 = -INF;
 26         int nn1 = INF,nn2 = INF;
 27         for(int i = 1;i <= n;++i) {
 28             if(t[i] > mm1) {
 29                 mm2 = mm1;
 30                 mm1 = t[i];
 31             }
 32             else if(t[i] > mm2)
 33                 mm2 = t[i];
 34 
 35             if(t[i] < nn1) {
 36                 nn2 = nn1;
 37                 nn1 = t[i];
 38             }
 39             else if(t[i] < nn2)
 40                 nn2 = t[i];
 41             if(abs(t[i]) > abs(maxx1)) {
 42                 maxx2 = maxx1;
 43                 maxx1 = t[i];
 44             }
 45             else if(abs(t[i]) > abs(maxx2))
 46                 maxx2 = t[i];
 47 
 48             if(abs(t[i]) < abs(mn1)) {
 49                 mn2 = mn1;
 50                 mn1 = t[i];
 51             }
 52             else if(abs(t[i]) < abs(mn2))
 53                 mn2 = t[i];
 54 
 55         }
 56         LL res1,res2;
 57         if(a >= 0) {
 58             res1 = (LL)a*maxx1*maxx1;
 59             if(b >= 0) {
 60                 if(mm1 != maxx1) res1 += (LL)b*mm1;
 61                 else res1+= (LL)b*mm2;
 62             }
 63             else {
 64                 if(nn1 != maxx1) res1 += (LL)b*nn1;
 65                 else res1 += (LL)b*nn2;
 66             }
 67         }
 68         else {
 69             res1 = (LL)a*mn1*mn1;
 70             if(b >= 0) {
 71                 if(mm1 != mn1) res1 += (LL)b*mm1;
 72                 else res1 += (LL)b*mm2;
 73             }
 74             else {
 75                 if(nn1 != mn1) res1 += (LL)b*nn1;
 76                 else res1 += (LL)b*nn2;
 77             }
 78         }
 79         if(b >= 0) {
 80             res2 = (LL)b*mm1;
 81             if(a >= 0) {
 82                 if(maxx1 != mm1) res2 += (LL)a*maxx1*maxx1;
 83                 else res2 += (LL)a*maxx2*maxx2;
 84             }
 85             else {
 86                 if(mn1 != mm1) res2 += (LL)a*mn1*mn1;
 87                 else res2 += (LL)a*mn2*mn2;
 88             }
 89         }
 90         else {
 91             res2 = (LL)b*nn1;
 92             if(a >= 0) {
 93                 if(maxx1 != nn1) res2 += (LL)a*maxx1*maxx1;
 94                 else res2 += (LL)a*maxx2*maxx2;
 95             }
 96             else {
 97                 if(mn1 != nn1) res2 += (LL)a*mn1*mn1;
 98                 else res2 += (LL)a*mn2*mn2;
 99             }
100         }
101 
102         printf("Case #%d: %I64d\n", tt, max(res1,res2));
103     }
104     return 0;
105 }