oj.uz

Submission #357716

# Submission time Handle Problem Language Result Execution time Memory
357716 2021-01-24T13:36:40 Z mjhmjh1104 Colors (BOI20_colors) C++14
0 / 100
 1 ms 384 KB 
#include <cstdio>
#include <vector>
#include <algorithm>
using namespace std;

vector<long long> v;

long long n;
int t;

int main() {
    scanf("%lld", &n);
    long long curr = 1;
    long long l = n / 2, r = n - 1;
    while (l < r) {
        v.push_back(l);
        l = (l + r) / 2 + 1;
    }
    v.push_back(l);
    reverse(v.begin(), v.end());
    for (auto &i: v) {
        if (curr + i <= n) curr += i;
        else curr -= i;
    }
    printf("? %lld\n", curr);
    fflush(stdout);
    scanf("%*d");
    l = 0, r = n - 1;
    while (l < r) {
        long long m = (l + r) / 2;
        if (curr + m <= n) curr += m;
        else curr -= m;
        printf("? %lld\n", curr);
        fflush(stdout);
        scanf("%d", &t);
        if (t) r = m;
        else l = m + 1;
    }
    if (l == n - 1) {
        printf("? %lld\n", n);
        fflush(stdout);
        scanf("%d", &t);
        if (t) printf("= %lld\n", n - 1);
        else printf("= %lld\n", n);
    } else printf("= %lld\n", l);
    fflush(stdout);
}

Compilation message

Colors.cpp: In function 'int main()':
Colors.cpp:12:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   12 |     scanf("%lld", &n);
      |     ~~~~~^~~~~~~~~~~~
Colors.cpp:27:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   27 |     scanf("%*d");
      |     ~~~~~^~~~~~~
Colors.cpp:35:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   35 |         scanf("%d", &t);
      |         ~~~~~^~~~~~~~~~
Colors.cpp:42:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   42 |         scanf("%d", &t);
      |         ~~~~~^~~~~~~~~~

Subtask #1
0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 384 KB OK (4 queries)
2 Correct 0 ms 256 KB OK (6 queries)
3 Correct 0 ms 256 KB OK (4 queries)
4 Incorrect 1 ms 256 KB Hair color 20 was used multiple times
5 Halted 0 ms 0 KB -

Subtask #2
0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 384 KB OK (4 queries)
2 Correct 0 ms 256 KB OK (6 queries)
3 Correct 0 ms 256 KB OK (4 queries)
4 Incorrect 1 ms 256 KB Hair color 20 was used multiple times
5 Halted 0 ms 0 KB -

Subtask #3
0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 384 KB OK (4 queries)
2 Correct 0 ms 256 KB OK (6 queries)
3 Correct 0 ms 256 KB OK (4 queries)
4 Incorrect 1 ms 256 KB Hair color 20 was used multiple times
5 Halted 0 ms 0 KB -

Subtask #4
0 / 24.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 384 KB OK (4 queries)
2 Correct 0 ms 256 KB OK (6 queries)
3 Correct 0 ms 256 KB OK (4 queries)
4 Incorrect 1 ms 256 KB Hair color 20 was used multiple times
5 Halted 0 ms 0 KB -

Subtask #5
0 / 33.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 384 KB OK (4 queries)
2 Correct 0 ms 256 KB OK (6 queries)
3 Correct 0 ms 256 KB OK (4 queries)
4 Incorrect 1 ms 256 KB Hair color 20 was used multiple times
5 Halted 0 ms 0 KB -