Problem 223: Rectangle area
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problems/223-rectangle-area/Makefile
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problems/223-rectangle-area/Makefile
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all: lib.o main.o
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gcc -Wall -o bin lib.o main.o
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lib.o: lib.c
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gcc -c -Wall lib.c
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main.o: main.c
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gcc -c -Wall main.c
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run:
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./bin
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clean:
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rm *.o bin
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problems/223-rectangle-area/lib.c
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problems/223-rectangle-area/lib.c
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#include "lib.h"
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int _findIntersection(int a_start, int a_end, int b_start, int b_end) {
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// aaaa
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// bbbb
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if (a_end > b_start && a_start <= b_start && a_end <= b_end)
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return a_end - b_start;
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// aa
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// bbbbbb
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if (a_start >= b_start && a_end <= b_end)
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return a_end - a_start;
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// aaaa
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// bbbb
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if (a_start >= b_start && a_start < b_end && a_end >= b_end)
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return b_end - a_start;
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// aaaaa
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// bb
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if (b_start >= a_start && b_end <= a_end)
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return b_end - b_start;
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return 0;
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}
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int computeArea(int ax1, int ay1, int ax2, int ay2, int bx1, int by1, int bx2, int by2) {
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// Area of the first rectangle
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int a = (ax2 - ax1) * (ay2 - ay1);
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// Area of the second rectangle
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int b = (bx2 - bx1) * (by2 - by1);
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// Find intersection
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int x_intersection = _findIntersection(ax1, ax2, bx1, bx2);
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int y_intersection = _findIntersection(ay1, ay2, by1, by2);
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return a + b - x_intersection * y_intersection;
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}
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problems/223-rectangle-area/lib.h
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problems/223-rectangle-area/lib.h
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#pragma once
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int computeArea(int ax1, int ay1, int ax2, int ay2, int bx1, int by1, int bx2, int by2);
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problems/223-rectangle-area/main.c
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problems/223-rectangle-area/main.c
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#include <stdio.h>
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#include "lib.h"
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int main() {
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int res1 = computeArea(-3, 0, 3, 4, 0, -1, 9, 2);
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printf("Test 1: %d\n", res1 == 45);
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int res2 = computeArea(-2, -2, 2, 2, -2, -2, 2, 2);
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printf("Test 2: %d\n", res2 == 16);
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return 0;
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}
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problems/223-rectangle-area/readme.md
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problems/223-rectangle-area/readme.md
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# 223. Rectangle area
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[Leetcode](https://leetcode.com/problems/rectangle-area/)
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Given the coordinates of two rectilinear rectangles in a 2D plane,
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return the total area covered by the two rectangles.
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The first rectangle is defined by its
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bottom-left corner (ax1, ay1) and its
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top-right corner (ax2, ay2).
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The second rectangle is defined by its
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bottom-left corner (bx1, by1) and its
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top-right corner (bx2, by2).
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