Print peaks of a matrix

01.peaks.cpp

// 01.peaks.cpp
// juanfc 2018-02-06

#include <iostream>
#include <array>
using namespace std;

const int N = 3;
typedef array<int,N> TRow;
typedef array<TRow,N> TSqMat;


void printPeaks(TSqMat m);

int main()
{
    TSqMat  a = {{  {{4, 5, 3}},
                    {{6, 2, 2}},
                    {{1, 8, 7}} }},
            b = {{  {{1, 2, 3}},
                    {{4, 5, 6}},
                    {{7, 8, 9}} }},
            c = {{  {{4, 4, 4}},
                    {{4, 4, 4}},
                    {{4, 4, 4}} }},
            d = {{  {{9, 8, 7}},
                    {{6, 5, 4}},
                    {{3, 2, 1}} }};
    printPeaks(a); cout << endl;
    printPeaks(b); cout << endl;
    printPeaks(c); cout << endl;
    printPeaks(d); cout << endl;
    return 0;
}


bool isPeak(TSqMat m, int i, int j);

void printPeaks(TSqMat m)
{
    for (int i = 0; i < N; ++i)
        for (int j = 0; j < N; ++j)
            if (isPeak(m, i, j) )
                cout << "Row " << i << " column " << j << ", value " << m[i][j] << endl;
}

bool isOut(int row, int col);

bool isPeak(TSqMat m, int i, int j)
{
    return
        (isOut(i-1, j) or m[i-1][j] <= m[i][j]) and
        (isOut(i+1, j) or m[i+1][j] <= m[i][j]) and
        (isOut(i, j-1) or m[i][j-1] <= m[i][j]) and
        (isOut(i, j+1) or m[i][j+1] <= m[i][j]);
}

bool isOut(int row, int col)
{
    return row < 0 or row >= N or col < 0 or col >= N;
}