func_code_string: #include <bits/stdc++.h>   #pragma GCC optimize( Ofast )   #pragma GCC optimization( unroll-loops )   using namespace std;   const int INF = 0x3f3f3f3f;   const long long LINF = 0x3f3f3f3f3f3f3f3fll;   int read_int() {     bool minus = false;     int result = 0;     char ch;     ch = getchar();     while (1) {       if (ch ==  - ) break;       if (ch >=  0  && ch <=  9 ) break;       ch = getchar();     }     if (ch ==  - )       minus = true;     else       result = ch -  0 ;     while (1) {       ch = getchar();       if (ch <  0  || ch >  9 ) break;       result = result * 10 + (ch -  0 );     }     if (minus)       return -result;     else       return result;   }   const int MAX = 2e5 + 10;   unsigned char v[MAX];   int main() {     ios_base::sync_with_stdio(0);     cin.tie(0);     int n = read_int();     for (int i = 0; i < n; i++) v[i] = read_int();     int q = read_int();     while (q--) {       int l = read_int(), r = read_int();       unsigned char x = read_int(), y = read_int();       l--, r--;       for (int i = l; i <= r; i++) v[i] = v[i] == x ? y : v[i];     }     for (int i = 0; i < n; i++) cout << int(v[i]) <<    ;     cout <<   n ;     exit(0);   }   