Returns the largest child array in the integer array.

struct maxInfo{        int start;        int end;        int max;};bool maxValue(int a[], int n, maxInfo& mi ){        if( n < 0 ) { return false;}            mi.start = mi.end = 0;        mi.max = a[0];        int i;        int curValue = mi.max;        for( i = 1; i < n ; i ++)        {                if(curValue + a[i] > mi.max)                {                        if(curValue < 0 ) {                                mi.start = mi.end = i;                                mi.max = a[i];                                curValue = a[i];                        } else {                                mi.end = i;                                mi.max += a[i];                                curValue +=a[i];                        }                } else {                        curValue += a[i];                }        }        return true;}

The algorithm is simple as follows:

 

 

The test code is as follows:

#include <iostream>#include <vector>#include <iterator>#include <istream>using namespace std;struct maxInfo{        int start;        int end;        int max;};void maxValue(vector<int> a, maxInfo &mi){        mi.start = mi.end = 0;        mi.max = a[0];        int i;        int curValue = mi.max;        int n = a.size();        for( i = 1; i < n ; i ++)        {                if(curValue + a[i] > mi.max)                {                        if(curValue < 0 ) {                                mi.start = mi.end = i;                                mi.max = a[i];                                curValue = a[i];                        } else {                                mi.end = i;                                mi.max += a[i];                                curValue +=a[i];                        }                } else {                        curValue += a[i];                }        }}int main(){        maxInfo mi;        cout << "Input the datas : " ;        istream_iterator<int> begin(cin), end;        vector<int>  vc(begin, end);        maxValue(vc, mi);        cout << "[ " << mi.start << ", " << mi.end << " ]" << endl;        cout << "Max value is: " << mi.max <<endl;        cout << "Sub array is : " <<endl;        copy(vc.begin() + mi.start, vc.begin() + mi.end + 1, ostream_iterator<int> (cout, " "));        return 0;}