View Compilation Error

0_0_36108525_23497.c: In function 'dfs':
0_0_36108525_23497.c:15:5: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
     for (int i = 0; i <= up; ++i) {
     ^
0_0_36108525_23497.c:15:5: note: use option -std=c99, -std=gnu99, -std=c11 or -std=gnu11 to compile your code
0_0_36108525_23497.c: In function 'main':
0_0_36108525_23497.c:42:5: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
     for (int cas = 1; T--; ++cas) {
     ^