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#include <iostream>
#include <vector>
//#include <gtest/gtest.h>
using std::vector;
vector<vector<int>> optimalWeight2DArray(int W, vector<int> &w2) {
int j = w2.size();
// int value[W + 1][j + 1];
vector<vector<int> > value(W + 1, vector<int>(j + 1));
for (int i = 0; i < j + 1; i++) {
for (int w = 0; w < W + 1; w++) {
if (i == 0 || w == 0) {
value[w][i] = 0;
continue;
}
value[w][i] = value[w][i - 1];
if (w2[i - 1] <= w) {
int val = value[w - w2[i - 1]][i - 1] + w2[i - 1];
if (value[w][i] < val) {
value[w][i] = val;
}
}
}
}
return value;
}
int partition3(vector<int> &a) {
if (a.size() < 3)
return 0;
int sum = 0;
for (int i = 0; i < a.size(); i++) {
sum = sum + a[i];
}
if (sum % 3 != 0)
return 0;
int W = sum / 3;
vector<vector<int> > values = optimalWeight2DArray(W, a);
int count = 0;
for (int i = 1; i < a.size() + 1; i++) {
for (int w = 1; w < W + 1; w++) {
if (values[w][i] == W)
count = count + 1;
}
}
if (count >= 3)
return 1;
else
return 0;
}
//TEST(KnapsackPartition3, t1) {
// vector<int> a = { 3, 3, 3, 3 };
// ASSERT_EQ(0, partition3(a));
//}
//
//TEST(KnapsackPartition3, t2) {
// vector<int> a = { 30 };
// ASSERT_EQ(0, partition3(a));
//}
//
//TEST(KnapsackPartition3, t3) {
// vector<int> a = { 1, 2, 3, 4, 5, 5, 7, 7, 8, 10, 12, 19, 25 };
// ASSERT_EQ(1, partition3(a));
//}
int main() {
int n;
std::cin >> n;
vector<int> A(n);
for (size_t i = 0; i < A.size(); ++i) {
std::cin >> A[i];
}
std::cout << partition3(A) << '\n';
}
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