我正在尝试解决SPOJ https://www.spoj.com/problems/PALIN/上的PALINDROME问题。我已经尝试过几次提交具有更改的解决方案，但仍然得到
Runtime error: SIGABRT
对于我尝试过的所有情况，输出都是正确的，但是问题仍然存在。
这是我的代码：
#include<bits/stdc++.h>
using namespace std;
int numhasall9(string n){
int alln=0, nalln=0;
int val = n.length();
for(int i=0;i<n.length();i++){
//cout << n[i] << endl;
if(n[i] != '9'){
nalln += 1;
}
else{alln += 1;}
}
if(alln == val)
return 1;
else
return -1;
}
int main(){
int testcases;
scanf("%d",&testcases);
while(testcases--){
int l;
string num;
cin >> num;
l = num.length();
//printf("%d\n",l);
if (l%2 == 0){
int temp = numhasall9(num);
if(temp == 1){
int seclen = l -1;
string temp11;
string dest = string(seclen,'0').append(temp11);
dest.insert(0,to_string(1));
dest.insert(num.length(),to_string(1));
cout << dest << endl;}
else{
int half = l/2;
//printf("%d\n",half);
string lst = num.substr(0,half);
string lst_cpy = lst;
reverse(lst.begin(),lst.end());
//cout << lst << endl;
string rst = num.substr(half,l-1);
//cout << rst << endl;
//string reverse_l = reverse(l.begin(), l.end());
if ((lst.compare(rst)) <= 0){
long long int num2 = stoi(lst_cpy) + 1;
string three = to_string(num2);
string five = three;
reverse(three.begin(), three.end());
string evenlen1 = five.append(three);
cout << evenlen1 << endl;
}
else if ((lst.compare(rst)) > 0){
string evenlen1 = lst_cpy.append(lst);
cout << evenlen1 << endl;}
}
}
else if (l%2 != 0){
if(num.length() == 1) cout << num << endl;
else{
int temp1 = numhasall9(num);
if(temp1 == 1){
//printf("-----ENTERING");
int seclen1 = l -1;
string temp22;
//cout << "Entering the loop" << endl;
string dest1 = string(seclen1,'0').append(temp22);
//cout << dest1 << endl;
dest1.insert(0,to_string(1));
dest1.insert(num.length(),to_string(1));
cout << dest1 << endl;}
else{
//printf("ENTERINZZZG");
//cout << temp1 << endl;
int mid_elem = l/2;
//cout << num[mid_elem] << endl;
string ls_cpy;
//cout << num[mid_elem] << endl;
string ls = num.substr(0,mid_elem);
//cout << ls << endl;
ls_cpy = ls;
//strcpy(ls,ls_cpy);
string rs = num.substr(mid_elem+1,l-1);
//cout << rs << endl;
reverse(ls.begin(),ls.end());
//cout << ls << endl;
string mid_elem_str = to_string(mid_elem);
if ((ls.compare(rs) <= 0)){
if (num[mid_elem] == '9'){
long long int num_ls_cpy = stoi(ls_cpy) + 1;
string cp_ls_cpy = to_string(num_ls_cpy);
string copy_cp_ls_cpy = cp_ls_cpy;
reverse(cp_ls_cpy.begin(),cp_ls_cpy.end());
string tot1 = copy_cp_ls_cpy + '0' + cp_ls_cpy;
cout << tot1 << endl;}
else{
//cout << "Entering this loop" << endl;
long long int add_mid_elem = stoi(num.substr(mid_elem,1)) + 1;
//cout << add_mid_elem << endl;
//string reverse_ls = reverse(ls.begin(),ls.end());
string added_mid_elem = to_string(add_mid_elem);
string new_str = ls_cpy + added_mid_elem + ls;
cout << new_str << endl;}
}
else if ((ls.compare(rs) > 0)){
//printf("Entering this");
//reverse(ls.begin(),ls.end());
string tot = ls_cpy + num[mid_elem] + ls;
cout << tot << endl;
}
}
}
}
}
return 0;
}
请建议我是否错过了一些东西！