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1001 Senior‘s Array
题目链接:1001
题意:给你一个长度为n的序列,你必须修改序列中的某个数为P,求修改后的最大连续子序列和。
思路:数据量比较小,可以直接暴力做, 枚举序列的每个数修改成P,然后更新最大子序列和。
code:
1 #include <iostream> 2 #include <algorithm> 3 using namespace std; 4 const int MAXN = 1005; 5 typedef long long LL; 6 int a[MAXN]; 7 8 LL getSum(int a[], int n) 9 { 10 LL maxSum = 0, tmpSum = 0; 11 int maxNum = -1000000001; 12 for (int i = 0; i < n; ++i) 13 { 14 tmpSum += a[i]; 15 if (maxSum < tmpSum) 16 maxSum = tmpSum; 17 else if (tmpSum < 0) 18 tmpSum = 0; 19 maxNum = max(maxNum, a[i]); 20 } 21 if (maxSum == 0) return (LL)maxNum; 22 return maxSum; 23 } 24 25 int main() 26 { 27 int nCase; 28 cin >> nCase; 29 while (nCase--) 30 { 31 int n, P; 32 cin >> n >> P; 33 for (int i = 0; i < n; ++i) 34 cin >> a[i]; 35 LL ans = -1000000001; 36 for (int i = 0; i < n; ++i) 37 { 38 int t = a[i]; 39 a[i] = P; 40 ans = max(ans, getSum(a, n)); 41 a[i] = t; 42 } 43 cout << ans << endl; 44 } 45 return 0; 46 }
1002 Senior‘s Gun
题目链接:1002
题意:有n把枪每把枪都有一定的攻击值,有m个怪兽每个怪兽都有一定的防御值,当攻击值大于防御值时才能击杀怪兽并获得他们差值的酬劳,求最大酬劳。
思路:容易发现最后的方案一定是攻击力最强的k把枪消灭了防御力最弱的k只怪物。
code:
1 #include <iostream> 2 #include <algorithm> 3 using namespace std; 4 const int MAXN = 100005; 5 typedef long long LL; 6 int a[MAXN]; 7 int b[MAXN]; 8 9 bool cmp(int x, int y) 10 { 11 return x > y; 12 } 13 14 int main() 15 { 16 int nCase; 17 cin >> nCase; 18 while (nCase--) 19 { 20 int n, m; 21 cin >> n >> m; 22 for (int i = 0; i < n; ++i) 23 cin >> a[i]; 24 for (int i = 0; i < m; ++i) 25 cin >> b[i]; 26 sort(a, a + n, cmp); 27 sort(b, b + m); 28 LL ans = 0; 29 int p = 0, q = 0; 30 while (p < n && q < m) 31 { 32 if (a[p] > b[q]) 33 { 34 ans += a[p] - b[q]; 35 ++p; 36 ++q; 37 } 38 else break; 39 } 40 cout << ans << endl; 41 } 42 return 0; 43 }
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原文地址:http://www.cnblogs.com/ykzou/p/4640575.html