#include <stdio.h>
int max(int a, int b) { return a > b ? a : b; }
int query(int i, int j) {
int x;
printf("? %d %d\n", i + 1, j + 1), fflush(stdout);
scanf("%d", &x);
return x;
}
int main() {
int n, t, i, l, l_;
scanf("%d", &n);
l_ = 0;
for (t = 0; t <= 1; t++) {
for (i = 0, l = t; i < n; i++)
while (i > 0 && i + l < n && query(i - 1, i + l))
i--, l += 2;
l_ = max(l_, l);
}
printf("! %d\n", l_), fflush(stdout);
return 0;
}
Compilation message
Main.c: In function 'query':
Main.c:9:2: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
9 | scanf("%d", &x);
| ^~~~~~~~~~~~~~~
Main.c: In function 'main':
Main.c:16:2: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
16 | scanf("%d", &n);
| ^~~~~~~~~~~~~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
106 ms |
208 KB |
Output is correct |
| 2 |
Correct |
110 ms |
208 KB |
Output is correct |
| 3 |
Correct |
106 ms |
208 KB |
Output is correct |
| 4 |
Correct |
108 ms |
208 KB |
Output is correct |
| 5 |
Correct |
131 ms |
208 KB |
Output is correct |
| 6 |
Correct |
122 ms |
208 KB |
Output is correct |
| 7 |
Correct |
78 ms |
208 KB |
Output is correct |
| 8 |
Correct |
117 ms |
208 KB |
Output is correct |
| 9 |
Correct |
117 ms |
208 KB |
Output is correct |
| 10 |
Correct |
89 ms |
208 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
106 ms |
208 KB |
Output is correct |
| 2 |
Correct |
110 ms |
208 KB |
Output is correct |
| 3 |
Correct |
106 ms |
208 KB |
Output is correct |
| 4 |
Correct |
108 ms |
208 KB |
Output is correct |
| 5 |
Correct |
131 ms |
208 KB |
Output is correct |
| 6 |
Correct |
122 ms |
208 KB |
Output is correct |
| 7 |
Correct |
78 ms |
208 KB |
Output is correct |
| 8 |
Correct |
117 ms |
208 KB |
Output is correct |
| 9 |
Correct |
117 ms |
208 KB |
Output is correct |
| 10 |
Correct |
89 ms |
208 KB |
Output is correct |
| 11 |
Correct |
673 ms |
208 KB |
Output is correct |
| 12 |
Correct |
858 ms |
208 KB |
Output is correct |
| 13 |
Correct |
1052 ms |
208 KB |
Output is correct |
| 14 |
Correct |
966 ms |
208 KB |
Output is correct |
| 15 |
Correct |
809 ms |
208 KB |
Output is correct |
| 16 |
Correct |
1055 ms |
208 KB |
Output is correct |
| 17 |
Correct |
896 ms |
208 KB |
Output is correct |
| 18 |
Correct |
998 ms |
208 KB |
Output is correct |
| 19 |
Correct |
879 ms |
208 KB |
Output is correct |
| 20 |
Correct |
916 ms |
208 KB |
Output is correct |
| 21 |
Correct |
943 ms |
208 KB |
Output is correct |
| 22 |
Correct |
844 ms |
208 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
1401 ms |
208 KB |
Output is correct |
| 2 |
Correct |
1145 ms |
276 KB |
Output is correct |
| 3 |
Correct |
1405 ms |
272 KB |
Output is correct |
| 4 |
Correct |
1200 ms |
276 KB |
Output is correct |
| 5 |
Correct |
790 ms |
208 KB |
Output is correct |
| 6 |
Correct |
1451 ms |
272 KB |
Output is correct |
| 7 |
Correct |
1262 ms |
208 KB |
Output is correct |
| 8 |
Correct |
1354 ms |
256 KB |
Output is correct |
| 9 |
Correct |
1094 ms |
208 KB |
Output is correct |
| 10 |
Correct |
1580 ms |
208 KB |
Output is correct |
| 11 |
Correct |
1481 ms |
208 KB |
Output is correct |
| 12 |
Correct |
1294 ms |
208 KB |
Output is correct |
| 13 |
Correct |
1280 ms |
208 KB |
Output is correct |
| 14 |
Correct |
896 ms |
208 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
106 ms |
208 KB |
Output is correct |
| 2 |
Correct |
110 ms |
208 KB |
Output is correct |
| 3 |
Correct |
106 ms |
208 KB |
Output is correct |
| 4 |
Correct |
108 ms |
208 KB |
Output is correct |
| 5 |
Correct |
131 ms |
208 KB |
Output is correct |
| 6 |
Correct |
122 ms |
208 KB |
Output is correct |
| 7 |
Correct |
78 ms |
208 KB |
Output is correct |
| 8 |
Correct |
117 ms |
208 KB |
Output is correct |
| 9 |
Correct |
117 ms |
208 KB |
Output is correct |
| 10 |
Correct |
89 ms |
208 KB |
Output is correct |
| 11 |
Correct |
673 ms |
208 KB |
Output is correct |
| 12 |
Correct |
858 ms |
208 KB |
Output is correct |
| 13 |
Correct |
1052 ms |
208 KB |
Output is correct |
| 14 |
Correct |
966 ms |
208 KB |
Output is correct |
| 15 |
Correct |
809 ms |
208 KB |
Output is correct |
| 16 |
Correct |
1055 ms |
208 KB |
Output is correct |
| 17 |
Correct |
896 ms |
208 KB |
Output is correct |
| 18 |
Correct |
998 ms |
208 KB |
Output is correct |
| 19 |
Correct |
879 ms |
208 KB |
Output is correct |
| 20 |
Correct |
916 ms |
208 KB |
Output is correct |
| 21 |
Correct |
943 ms |
208 KB |
Output is correct |
| 22 |
Correct |
844 ms |
208 KB |
Output is correct |
| 23 |
Correct |
1401 ms |
208 KB |
Output is correct |
| 24 |
Correct |
1145 ms |
276 KB |
Output is correct |
| 25 |
Correct |
1405 ms |
272 KB |
Output is correct |
| 26 |
Correct |
1200 ms |
276 KB |
Output is correct |
| 27 |
Correct |
790 ms |
208 KB |
Output is correct |
| 28 |
Correct |
1451 ms |
272 KB |
Output is correct |
| 29 |
Correct |
1262 ms |
208 KB |
Output is correct |
| 30 |
Correct |
1354 ms |
256 KB |
Output is correct |
| 31 |
Correct |
1094 ms |
208 KB |
Output is correct |
| 32 |
Correct |
1580 ms |
208 KB |
Output is correct |
| 33 |
Correct |
1481 ms |
208 KB |
Output is correct |
| 34 |
Correct |
1294 ms |
208 KB |
Output is correct |
| 35 |
Correct |
1280 ms |
208 KB |
Output is correct |
| 36 |
Correct |
896 ms |
208 KB |
Output is correct |
| 37 |
Correct |
1185 ms |
208 KB |
Output is correct |
| 38 |
Correct |
1079 ms |
208 KB |
Output is correct |
| 39 |
Correct |
1333 ms |
208 KB |
Output is correct |
| 40 |
Correct |
1425 ms |
208 KB |
Output is correct |
| 41 |
Correct |
1316 ms |
208 KB |
Output is correct |
| 42 |
Correct |
1446 ms |
208 KB |
Output is correct |
| 43 |
Correct |
1335 ms |
208 KB |
Output is correct |
| 44 |
Correct |
885 ms |
276 KB |
Output is correct |
| 45 |
Correct |
1399 ms |
208 KB |
Output is correct |
| 46 |
Correct |
964 ms |
208 KB |
Output is correct |
| 47 |
Correct |
1450 ms |
208 KB |
Output is correct |
| 48 |
Correct |
854 ms |
208 KB |
Output is correct |
| 49 |
Correct |
1407 ms |
208 KB |
Output is correct |
| 50 |
Correct |
1357 ms |
208 KB |
Output is correct |
| 51 |
Correct |
1171 ms |
276 KB |
Output is correct |
| 52 |
Correct |
1501 ms |
208 KB |
Output is correct |
