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Copy pathsubsums.cpp
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executable file
·55 lines (46 loc) · 1.22 KB
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/*
* subsums.cpp
*
* Created on: 2013-11-10
* Author: Rong Xiao
*/
#include <vector>
#include <cstdlib>
#include <iostream>
#include <ctime>
using std::cin;
using std::cout;
using std::endl;
using std::vector;
void computeSubsums(const vector<int>& vec, vector< vector<int> >& subsums) {
size_t n = vec.size();
for (size_t i = 0; i<n; i++) {
subsums[i][0] = vec[i];
for (size_t j=1; i+j<n; j++) {
subsums[i][j] = subsums[i][j-1] + vec[i+j];
}
}
}
int main(int argc, char** argv) {
size_t n = static_cast<size_t>(atoi(argv[1]));
vector<int> vec(n);
// cout << "Please input your " << m << " by " << n << " matrix row by row" << endl;
srand (time(NULL));
for (size_t i = 0; i < n; ++i) {
vec[i] = rand() % 11 - 6;
cout << ' ' << vec[i];
}
cout << endl;
vector<vector<int> > subsums;
for (size_t i = 0; i < n; ++i) {
subsums.push_back(vector<int>(n-i));
}
computeSubsums(vec, subsums);
for (size_t i = 0; i<n; i++) {
for (size_t j=0; i+j<n; j++) {
cout << ' ' << subsums[i][j];
}
cout << endl;
}
return 0;
}