0_0_23816717_28903.c: In function 'main':
0_0_23816717_28903.c:5:5: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
for (int i = 0; i < n; ++i) scanf("%d%d", &s[i], &e[i]);
^
0_0_23816717_28903.c:5:5: note: use option -std=c99, -std=gnu99, -std=c11 or -std=gnu11 to compile your code
0_0_23816717_28903.c:6:14: error: redefinition of 'i'
for (int i = 0; i < n - 1; ++i) {
^
0_0_23816717_28903.c:5:14: note: previous definition of 'i' was here
for (int i = 0; i < n; ++i) scanf("%d%d", &s[i], &e[i]);
^
0_0_23816717_28903.c:6:5: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
for (int i = 0; i < n - 1; ++i) {
^
0_0_23816717_28903.c:8:7: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
for (int j = i + 1; j < n; ++j) if (e[j] < e[k]) k = j;
^
0_0_23816717_28903.c:15:14: error: redefinition of 'i'
for (int i = 1; i < n; ++i) if (s[i] >= t) ++ans, t = e[i];
^
0_0_23816717_28903.c:6:14: note: previous definition of 'i' was here
for (int i = 0; i < n - 1; ++i) {
^
0_0_23816717_28903.c:15:5: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
for (int i = 1; i < n; ++i) if (s[i] >= t) ++ans, t = e[i];
^
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