How to realize word search in C language

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Word search

Given a m x n 2D character grid board and a string word word. Returns true if word exists in the grid; otherwise, returns false.

Words must be formed alphabetically from letters in adjacent cells, where "adjacent" cells are those cells that are horizontally or vertically adjacent. Letters in the same cell are not allowed to be reused.

The code solves the problem as follows:

Int pi,pj;//static int r [100] [100]; void f (char** board,int n, int mrec int [x] [y]) {int a [4] [2] = {{0lagre 1}, {- 1jue 0}, {0jue 1}, {1jue 0}; / / printf ("% d", r [x] [y]); int nx,ny; int iJue; int cc=0; int linger0 Int zx,zy; / / printf ("% d", r); / / r [x] [y] = 1; / printf ("- p% d% d", pscorz); if (m > = 3) r [0] [3] = 0; / / printf ("% d% c", r [0] [3], word [p]); for