Compilare: user.c: In function ‘suma’: user.c:24:3: warning: implicit declaration of function ‘abs’ [-Wimplicit-function-declaration] if ( abs(lim1 - X) % 2 == 0 && abs(lim2 - X) % 2 == 0 ) { ^ user.c: In function ‘main’: user.c:55:29: warning: variable ‘max_c’ set but not used [-Wunused-but-set-variable] int n, m, X, Y, i, max_s, max_c, max_k, j, tip; ^ user.c:57:10: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf (fin, "%d%d%d%d", &n, &m, &X, &Y ) ; ^ user.c:61:14: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf (fin, "%d", &mat[i][j] ) ; ^