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View Compilation Error

0_0_37332609_6575.cpp: In function 'int main()':
0_0_37332609_6575.cpp:5:32: error: 'scanf' was not declared in this scope
     while (scanf("%d%d", &n, &m) != EOF)
                                ^
0_0_37332609_6575.cpp:5:37: error: 'EOF' was not declared in this scope
     while (scanf("%d%d", &n, &m) != EOF)
                                     ^
0_0_37332609_6575.cpp:25:31: error: 'printf' was not declared in this scope
         printf("%d %d\n", x, y);
                               ^


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