Submission #357712

#	Time	Username	Problem	Language	Result	Execution time	Memory
357712		mjhmjh1104	Colors (BOI20_colors)	C++14	Compilation error	0 ms	0 KiB

Colors

#include <cstdio>
#include <vector>
using namespace std;

vector<int> v;

int n, t;

int main() {
    scanf("%d", &n);
    int curr = 1;
    int 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("? %d\n", curr);
    fflush(stdout);
    scanf("%*d");
    l = 0, r = n - 1;
    while (l < r) {
        int m = (l + r) / 2;
        if (curr + m <= n) curr += m;
        else curr -= m;
        printf("? %d\n", curr);
        fflush(stdout);
        scanf("%d", &t);
        if (t) r = m;
        else l = m + 1;
    }
    if (l == n - 1) {
        printf("? %d\n", n);
        fflush(stdout);
        scanf("%d", &t);
        if (t) printf("= %d\n", n - 1);
        else printf("= %d\n", n);
    } else printf("= %d\n", l);
    fflush(stdout);
}

Compilation message (stderr)

Colors.cpp: In function 'int main()':
Colors.cpp:18:5: error: 'reverse' was not declared in this scope
   18 |     reverse(v.begin(), v.end());
      |     ^~~~~~~
Colors.cpp:10:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   10 |     scanf("%d", &n);
      |     ~~~~~^~~~~~~~~~
Colors.cpp:25:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   25 |     scanf("%*d");
      |     ~~~~~^~~~~~~
Colors.cpp:33:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   33 |         scanf("%d", &t);
      |         ~~~~~^~~~~~~~~~
Colors.cpp:40:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   40 |         scanf("%d", &t);
      |         ~~~~~^~~~~~~~~~