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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
typedef enum op {
ADD = '+',
SUB = '-',
MUL = '*',
DIV = '/',
} op;
typedef struct ast {
op o;
int val1;
struct ast *child1;
int val2;
struct ast *child2;
} ast;
int main(){
FILE *f = fopen("test.in", "r");
char *expr = malloc(256);
fgets(expr, 256, f);
for (int i = 0; i < strlen(expr); i++){
}
}
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