Submission #31884

#	Time	Username	Problem	Language	Result	Execution time	Memory
31884		aome	Brunhilda’s Birthday (BOI13_brunhilda)	C++14	100 / 100	483 ms	89904 KiB

brunhilda

#include <bits/stdc++.h>
using namespace std;

const int M = 10000005;
const int INF = 1e9;

int n, q;
int nxt[M], res[M];
bool in[M];

int main() {
    scanf("%d %d", &n, &q);
    for (int i = 0; i < n; ++i) {
        int x; scanf("%d", &x), in[x] = 1;
    }
    for (int i = 2; i < M; ++i) {
        if (nxt[i] || !in[i]) continue;
        for (int j = 0; j < M; j += i) nxt[j] = max(nxt[j], i);
    }
    int cur = 0;
    for (int i = 1; i < M; ++i) {
        while (cur < i) {
            if (!nxt[cur] || cur + nxt[cur] <= i) cur++;
            else break;
        }
        if (cur == i) break;
        res[i] = res[cur] + 1;
    }
    while (q--) {
        int x; scanf("%d", &x);
        if (!res[x]) printf("oo\n");
        else printf("%d\n", res[x]);
    }
}

Compilation message (stderr)

brunhilda.cpp: In function 'int main()':
brunhilda.cpp:12:27: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d %d", &n, &q);
                           ^
brunhilda.cpp:14:42: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         int x; scanf("%d", &x), in[x] = 1;
                                          ^
brunhilda.cpp:30:31: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         int x; scanf("%d", &x);
                               ^

• Subtask 1: 20 / 20
• Subtask 2: 20 / 20
• Subtask 3: 60 / 60