HDU 1003 Max Sum
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Max Sum
Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 243667 Accepted Submission(s): 57534
Problem Description
Given a sequence a[1],a[2],a[3]......a[n], your job is to calculate the max sum of a sub-sequence. For example, given (6,-1,5,4,-7), the max sum in this sequence is 6 + (-1) + 5 + 4 = 14.
Input
The first line of the input contains an integer T(1<=T<=20) which means the number of test cases. Then T lines follow, each line starts with a number N(1<=N<=100000), then N integers followed(all the integers are between -1000 and 1000).
Output
For each test case, you should output two lines. The first line is "Case #:", # means the number of the test case. The second line contains three integers, the Max Sum in the sequence, the start position of the sub-sequence, the end position of the sub-sequence. If there are more than one result, output the first one. Output a blank line between two cases.
Sample Input
25 6 -1 5 4 -77 0 6 -1 1 -6 7 -5
Sample Output
Case 1:14 1 4Case 2:7 1 6
Author
Ignatius.L
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经典的动态规划(最长子序列)
#include <iostream>#include <cstdio>#include <cstring>#include <algorithm>#include <cmath>#include <queue>#include <map>#include <vector>#include <set>#define maxn 100010#define inf 0x3f3f3f3f3f3f#define mod 1000007using namespace std;typedef long long ll;int dp[maxn];int num[maxn];int main(){ int t; int n; scanf("%d",&t); int cas=1; while(t--) { scanf("%d",&n); for(int i=1;i<=n;i++) { scanf("%d",&num[i]); } int st=0,end=1; ll maxsum=-100100; ll sum=0; int temp=1; for(int i=1;i<=n;i++) { sum+=num[i]; if(sum>maxsum) { maxsum=sum; st=temp; end=i; } if(sum<0) { sum=0; temp=i+1; } } printf("Case %d:\n",cas++); printf("%lld %d %d\n",maxsum,st,end); if(t!=0)printf("\n"); }}
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