0_0_28273141_2270.c: In function 'main':
0_0_28273141_2270.c:8:3: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
for(int i =0;i<M*3;++i){
^
0_0_28273141_2270.c:8:3: note: use option -std=c99, -std=gnu99, -std=c11 or -std=gnu11 to compile your code
0_0_28273141_2270.c:9:4: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
for(int j=0;j<M;++j)
^
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