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is_valid_sudoku.cc
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is_valid_sudoku.cc
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#include <cmath>
#include <deque>
#include <vector>
#include "test_framework/generic_test.h"
using std::deque;
using std::vector;
bool HasDuplicate(const vector<vector<int>>&, int, int, int, int);
// Check if a partially filled matrix has any conflicts.
bool IsValidSudoku(const vector<vector<int>>& partial_assignment) {
// Check row constraints.
for (int i = 0; i < size(partial_assignment); ++i) {
if (HasDuplicate(partial_assignment, i, i + 1, 0,
size(partial_assignment))) {
return false;
}
}
// Check column constraints.
for (int j = 0; j < size(partial_assignment); ++j) {
if (HasDuplicate(partial_assignment, 0, size(partial_assignment), j,
j + 1)) {
return false;
}
}
// Check region constraints.
int region_size = sqrt(size(partial_assignment));
for (int I = 0; I < region_size; ++I) {
for (int J = 0; J < region_size; ++J) {
if (HasDuplicate(partial_assignment, region_size * I,
region_size * (I + 1), region_size * J,
region_size * (J + 1))) {
return false;
}
}
}
return true;
}
// Return true if subarray partial_assignment[start_row, end_row -
// 1][start_col, end_col - 1] contains any duplicates in {1, 2, ...,
// size(partial_assignment)}; otherwise return false.
bool HasDuplicate(const vector<vector<int>>& partial_assignment, int start_row,
int end_row, int start_col, int end_col) {
deque<bool> is_present(size(partial_assignment) + 1, false);
for (int i = start_row; i < end_row; ++i) {
for (int j = start_col; j < end_col; ++j) {
if (partial_assignment[i][j] != 0 &&
is_present[partial_assignment[i][j]]) {
return true;
}
is_present[partial_assignment[i][j]] = true;
}
}
return false;
}
int main(int argc, char* argv[]) {
std::vector<std::string> args{argv + 1, argv + argc};
std::vector<std::string> param_names{"partial_assignment"};
return GenericTestMain(args, "is_valid_sudoku.cc", "is_valid_sudoku.tsv",
&IsValidSudoku, DefaultComparator{}, param_names);
}