View Compilation Error

0_0_17814222_10562.cpp: In function 'int main()':
0_0_17814222_10562.cpp:27:35: error: 'memset' was not declared in this scope
   memset(used, false, sizeof(used));
                                   ^
0_0_17814222_10562.cpp:41:28: error: expected unqualified-id before 'int'
    for (int i = start + 1, int j = start, flag = 1; i<n; i++)
                            ^
0_0_17814222_10562.cpp:41:28: error: expected ';' before 'int'
0_0_17814222_10562.cpp:41:41: error: expected ';' before ',' token
    for (int i = start + 1, int j = start, flag = 1; i<n; i++)
                                         ^
0_0_17814222_10562.cpp:41:41: error: expected primary-expression before ',' token
0_0_17814222_10562.cpp:41:51: error: expected ')' before ';' token
    for (int i = start + 1, int j = start, flag = 1; i<n; i++)
                                                   ^
0_0_17814222_10562.cpp:41:53: error: 'i' was not declared in this scope
    for (int i = start + 1, int j = start, flag = 1; i<n; i++)
                                                     ^