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View Compilation Error

0_0_21142065_28571.c:2:1: error: unknown type name 'using'
 using namespace std;
 ^
0_0_21142065_28571.c:2:17: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'std'
 using namespace std;
                 ^
0_0_21142065_28571.c:8:5: error: variably modified 'mp' at file scope
 int mp[maxn][maxn];
     ^
0_0_21142065_28571.c:8:5: error: variably modified 'mp' at file scope
0_0_21142065_28571.c: In function 'main':
0_0_21142065_28571.c:17:3: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
   for(int i=0;i<n;i++)
   ^
0_0_21142065_28571.c:17:3: note: use option -std=c99, -std=gnu99, -std=c11 or -std=gnu11 to compile your code
0_0_21142065_28571.c:19:4: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
    for(int j=0;j<n;j++)
    ^
0_0_21142065_28571.c:32:11: error: redefinition of 'i'
   for(int i=0;i<m;i++)
           ^
0_0_21142065_28571.c:17:11: note: previous definition of 'i' was here
   for(int i=0;i<n;i++)
           ^
0_0_21142065_28571.c:32:3: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
   for(int i=0;i<m;i++)
   ^
0_0_21142065_28571.c:40:3: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
   for(int k=0;k<n;k++)
   ^
0_0_21142065_28571.c:41:12: error: redefinition of 'i'
    for(int i=0;i<n;i++)
            ^
0_0_21142065_28571.c:32:11: note: previous definition of 'i' was here
   for(int i=0;i<m;i++)
           ^
0_0_21142065_28571.c:41:4: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
    for(int i=0;i<n;i++)
    ^
0_0_21142065_28571.c:42:5: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
     for(int j=0;j<n;j++)
     ^


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