Language: C++

/*
このコード、と～おれ!
Be accepted!
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*/

#include <cstdio>
#include <algorithm>
#include <string>
#include <cmath>
#include <cstring>
#include <vector>
#include <numeric>
#include <iostream>
#include <random>
#include <map>
#include <unordered_map>
#include <queue>
#include <regex>
#include <functional>
#include <complex>
#include <list>
#include <cassert>
#include <iomanip>
#include <set>
/*多倍長整数/cpp_intで宣言
#include <boost/multiprecision/cpp_int.hpp>
using namespace boost::multiprecision;
*/

#pragma gcc target ("avx2")
#pragma gcc optimization ("o3")
#pragma gcc optimization ("unroll-loops")
#define rep(i, n) for(int i = 0; i < (n); ++i)
#define rep1(i, n) for(int i = 1; i <= (n); ++i)
#define rep2(i, n) for(int i = 2; i < (n); ++i)
#define repr(i, n) for(int i = n; i >= 0; --i)
#define reprm(i, n) for(int i = n - 1; i >= 0; --i)
#define printynl(a) printf(a ? "yes\n" : "no\n")
#define printyn(a) printf(a ? "Yes\n" : "No\n")
#define printYN(a) printf(a ? "YES\n" : "NO\n")
#define printim(a) printf(a ? "possible\n" : "imposible\n")
#define printdb(a) printf("%.50lf\n", a) //少数出力
#define printdbd(a) printf("%.16lf\n", a) //少数出力(桁少なめ)
#define prints(s) printf("%s\n", s.c_str()) //string出力
#define all(x) (x).begin(), (x).end()
#define allsum(a, b, c) ((a + b) * c / 2.0) //等差数列の和、初項,末項,項数
#define pb push_back
#define priq priority_queue
#define rpriq priq<int, vector<int>, greater<int>>
#define deg_to_rad(deg) (((deg)/360.0)*2.0*PI)
#define rad_to_deg(rad) (((rad)/2.0/PI)*360.0)
#define Please return
#define AC 0
#define addf(T) [](T a, T b){return (a + b);}
#define minf(T) [](T a, T b){return min(a, b);}
#define maxf(T) [](T a, T b){return max(a, b);}
#define nopf(T) [](T a){return a;}
#define manhattan_dist(a, b, c, d) (abs(a - c) + abs(b - d)) /*(a, b) から (c, d) のマンハッタン距離 */


using ll = long long;

constexpr int INF = 1073741823;
constexpr int MINF = -1073741823;
constexpr ll LINF = ll(4661686018427387903);
constexpr ll MOD = 1000000007;
const long double PI = acos(-1.0L);

using namespace std;

void scans(string& str) {
	char c;
	str = "";
	scanf("%c", &c);
	if (c == '\n')scanf("%c", &c);
	while (c != '\n' && c != -1 && c != ' ') {
		str += c;
		scanf("%c", &c);
	}
}

void scanc(char& str) {
	char c;
	scanf("%c", &c);
	if (c == -1)return;
	while (c == '\n') {
		scanf("%c", &c);
	}
	str = c;
}

double acot(double x) {
	return PI / 2 - atan(x);
}

ll gcd(ll a, ll b) {
	if (b == 0) return a;
	return gcd(b, a % b);
}

ll lcm(ll number1, ll number2) {
	return number1 / gcd(number1, number2) * number2;
}

ll LSB(ll n) { return (n & (-n)); }

/*-----------------------------------------ここからコード-----------------------------------------*/



int main() {

	string s, ans, right, left;
	scans(s);
	int q;
	scanf("%d", &q);
	int t, f, rcnt = 0;
	char c;
	rep(i, q) {
		scanf("%d", &t);
		if (t == 1) {
			++rcnt;
		}
		else {
			scanf("%d%*c%c", &f, &c);
			if (rcnt & 1) {//ひっくり返ってる
				if (f == 2)left.insert(left.begin(), c);
				else right.pb(c);
			}
			else {
				if (f == 1)left.pb(left.begin(), c);
				else right.pb(c);
			}
		}
	}
	printf("%s%s%s\n", (rcnt % 2 ? left.c_str() : right.c_str()), s.c_str(), (rcnt % 2 == 0 ? left.c_str() : right.c_str()));

	Please AC;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:137:51: error: no matching function for call to 'std::__cxx11::basic_string<char>::push_back(std::__cxx11::basic_string<char>::iterator, char&)'
  137 |                                 if (f == 1)left.pb(left.begin(), c);
      |                                            ~~~~~~~^~~~~~~~~~~~~~~~~
In file included from /usr/include/c++/14/string:54,
                 from a.cc:14:
/usr/include/c++/14/bits/basic_string.h:1572:7: note: candidate: 'void std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::push_back(_CharT) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]'
 1572 |       push_back(_CharT __c)
      |       ^~~~~~~~~
/usr/include/c++/14/bits/basic_string.h:1572:7: note:   candidate expects 1 argument, 2 provided