0_0_21333745_20554.c: In function 'dfs':
0_0_21333745_20554.c:7:2: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
for(int i = 1; i <= n; i++) {
^
0_0_21333745_20554.c:7:2: note: use option -std=c99, -std=gnu99, -std=c11 or -std=gnu11 to compile your code
0_0_21333745_20554.c: In function 'main':
0_0_21333745_20554.c:24:2: error: expected expression before '/' token
//freopen("input.txt", "r", stdin);
^
0_0_21333745_20554.c:26:3: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
for(int i = 0; i <= n; i++) {
^
0_0_21333745_20554.c:28:4: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
for(int j = 0; j <= n; j++) {
^
0_0_21333745_20554.c:32:11: error: redefinition of 'i'
for(int i = 0; i < m; i++) {
^
0_0_21333745_20554.c:26:11: note: previous definition of 'i' was here
for(int i = 0; i <= n; i++) {
^
0_0_21333745_20554.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_21333745_20554.c:38:11: error: redefinition of 'i'
for(int i = 1; flag && i <= n; i++) {
^
0_0_21333745_20554.c:32:11: note: previous definition of 'i' was here
for(int i = 0; i < m; i++) {
^
0_0_21333745_20554.c:38:3: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
for(int i = 1; flag && i <= n; i++) {
^
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