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View Compilation Error

0_0_32764807_1552.c: In function 'main':
0_0_32764807_1552.c:36:9: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
         for (int i = 0; i < n; ++i)
         ^
0_0_32764807_1552.c:36:9: note: use option -std=c99, -std=gnu99, -std=c11 or -std=gnu11 to compile your code
0_0_32764807_1552.c:38:18: error: redefinition of 'i'
         for (int i = parent(n - 1); i >= 0; --i)
                  ^
0_0_32764807_1552.c:36:18: note: previous definition of 'i' was here
         for (int i = 0; i < n; ++i)
                  ^
0_0_32764807_1552.c:38:9: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
         for (int i = parent(n - 1); i >= 0; --i)
         ^
0_0_32764807_1552.c:45:18: error: redefinition of 'i'
         for (int i = 0; i < m; ++i)
                  ^
0_0_32764807_1552.c:38:18: note: previous definition of 'i' was here
         for (int i = parent(n - 1); i >= 0; --i)
                  ^
0_0_32764807_1552.c:45:9: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
         for (int i = 0; i < m; ++i)
         ^


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