View Compilation Error

0_0_33651171_12093.cpp: In function 'll read()':
0_0_33651171_12093.cpp:13:30: error: 'getchar_unlocked' was not declared in this scope
         c = getchar_unlocked();
                              ^
0_0_33651171_12093.cpp:17:30: error: 'getchar_unlocked' was not declared in this scope
         c = getchar_unlocked();
                              ^
0_0_33651171_12093.cpp: In function 'void write(ll)':
0_0_33651171_12093.cpp:22:35: error: 'putchar_unlocked' was not declared in this scope
     if (x < 0)putchar_unlocked('-'), x = -x;
                                   ^
0_0_33651171_12093.cpp:24:33: error: 'putchar_unlocked' was not declared in this scope
     putchar_unlocked(x % 10 + 48);
                                 ^
0_0_33651171_12093.cpp: In function 'int main()':
0_0_33651171_12093.cpp:153:62: error: 'putchar_unlocked' was not declared in this scope
         write(solver.MCMF(s, t).second),putchar_unlocked('\n');
                                                              ^