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Just found an edge case, when N is 1, this program will seg fault. after solve this case, the program got AC.

Hello I am using pointer to solve the problem, but it always get runtime error, can someone help me see what could cause the error? Thanks!



//uva 133
#include<cstdio>

typedef struct Node* PTR;
struct Node {
int val;
PTR left,right;
};

int main() {
int N,k,m;
while(scanf("%d %d %d",&N,&k,&m ...