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View Compilation Error

0_0_36418923_1887.c:46:1: error: unknown type name 'using'
 using namespace std;
 ^
0_0_36418923_1887.c:46:17: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'std'
 using namespace std;
                 ^
0_0_36418923_1887.c:48:5: error: variably modified 'bit' at file scope
 int bit[N], n, ok[N];
     ^
0_0_36418923_1887.c:48:16: error: variably modified 'ok' at file scope
 int bit[N], n, ok[N];
                ^
0_0_36418923_1887.c:49:8: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'void'
 inline void add(int x, int k){ while(x < n + 2){bit[x] += k;x += lowbit(x);} }
        ^
0_0_36418923_1887.c:50:8: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'int'
 inline int sum(int x)
        ^
0_0_36418923_1887.c: In function 'main':
0_0_36418923_1887.c:70:5: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
     for(int i = 1; i <= n; i++){
     ^
0_0_36418923_1887.c:70:5: note: use option -std=c99, -std=gnu99, -std=c11 or -std=gnu11 to compile your code


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