Victors implementation

#include <stdio.h>

int EntreAB(int num, int x, int y);

int main() {
    int arr[100][100], cury;
    int maxx = 0, maxy = 1;
    int i, i2;
    int scanx, scany;
    int startx, starty, endx, endy;
    int area, marea = 0, mstartx, mstarty, mendx, mendy;
    char output;


    while(!EntreAB(maxx, 1, 100000)) {
        printf("Introduza a quantidade de predios: ");
        scanf("%d", &maxx);
    }

    for(i = 0; i < maxx; i++) {
        printf("Introduza a altura para o predio N %d: ", i+1);

        scanf("%d", &cury);
        if(cury > maxy)
            maxy = cury;

        for(i2 = cury-1; i2 >= 0; i2--)
            arr[i][i2] = 1;
    }

    for(scany = 0; scany <= maxy; scany++) {
        for(scanx = 0; scanx <= maxx; scanx++) {
            startx = scanx;
            starty = scany;
            endx = startx;

            for(i = startx; i < maxx; i++)
            {
                if(arr[i][scany] == 1)
                    endx++;
                else
                    break;
            }

            endy = 0;
            area = (starty+1) * (endx - startx);

            if(area > marea) {
                marea = area;
                mstartx = startx;
                mstarty = starty;
                mendx = endx;
                mendy = endy;
            }

        }

    }

    for(i = mstarty; i > mendy; i--) {
        for(i2 = mstartx; i2 < mendx; i2++)
            arr[i2][i] = 2;
    }

    if(maxx < 10 && maxy < 10) {
        printf("\n\n\n\n");
        for(i = maxy-1; i >= 0; i--) {
            for(i2 = 0; i2 < maxx; i2++) {
                if(arr[i2][i] == 1)
                    output = '%';
                if(arr[i2][i] == 2)
                    output = '#';
                if(arr[i2][i] < 1)
                    output = ' ';

                if(i2 == 0)
                    printf("%d %c", i, output);
                else
                    printf("%c", output);
            }
            printf("\n");
        }

        printf("  ");
        for(i = 0; i < maxx; i++)
            printf("%d", i);
    }
    printf("\n\nMaior area: %d\nA partir de X:%d Y:%d Ate X:%d Y:%d\n", marea, mstartx, mstarty, mendx-1, mendy);
    return 0;
}

int EntreAB(int num, int x, int y) {
    return (num >= x && num <= y);
}