hdu 1003,nefu 728 max sum
2016-04-27 22:50
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Description
Given a sequence a[1],a[2],a[3]......a , 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
2 5 6 -1 5 4 -7 7 0 6 -1 1 -6 7 -5
Sample Output
Case 1: 14 1 4 Case 2: 7 1 6 //前1个数的DP值>=0,就加;DP值<0,就重新开始,自己本身。
#include <iostream> #include <algorithm> #include <cstdio> #include <cstring> using namespace std; int data[100005],dp[100005]; int main() { int c,num=0,n; cin>>c; while(c--) { num++; int maxx=-9999999,a=0,b=0; memset(dp,0,sizeof(dp)); cin>>n; for(int i=0;i<n;i++) scanf("%d",&data[i]); dp[0]=data[0]; for(int i=1;i<n;i++) { if(dp[i-1]>=0) { dp[i]=dp[i-1]+data[i]; } else { dp[i]=data[i]; a=i; } if(dp[i]>maxx) { maxx=dp[i]; b=i; } } printf("Case %d:\n",num); printf("%d %d %d\n",maxx,a+1,b+1); } return 0; }
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