Submission #155746

#	Time	Username	Problem	Language	Result	Execution time	Memory
155746		Flying_dragon_02	Brunhilda’s Birthday (BOI13_brunhilda)	C++14	56.03 / 100	1100 ms	157648 KiB

brunhilda

#include <bits/stdc++.h>
 
using namespace std;
 
#define fi first
#define se second
#define pb push_back
#define mp make_pair
 
typedef pair<int, int> ii;
 
const int mod = 1e9 + 7;
 
const int inf = 1e9;
 
int add(int x, int y) {
    return (1ll * x + 1ll * y) % mod;
}
 
int del(int x, int y) {
    return ((1ll * x - 1ll * y) % mod + mod) % mod;
}
 
int mul(int x, int y) {
    return (1ll * x * 1ll * y) % mod;
}
 
const int N = 1e7 + 5;
 
int dp[N], p[N];
int bit[2 * N];
 
void update(int x, int val) {
    while(x > 0) {
        bit[x] = min(bit[x], val);
        x -= x & (-x);
    }
}
 
int get(int x) {
    if(x == 0) return 0;
    int val = inf;
    while(x < 2 * N) {
        val = min(val, bit[x]);
        x += x & (-x);
    }
    return val;
}
 
int m, q;
 
int main() {
    scanf("%d%d", &m, &q);
    for(int i = 0; i < N; i++)
        p[i] = 0;
    for(int i = 1; i < 2 * N; i++)
        bit[i] = inf;
    for(int i = 1; i <= m; i++) {
        int x;
        scanf("%d", &x);
        for(int l = 0; l < N; l++) {
            if(x * l >= N) break;
            p[x * l] = max(p[x * l], x);
        }
    }
    for(int i = 0; i <= N - 5; i++) {
        dp[i] = get(i);
        if(!p[i]) continue;
        update(i + p[i] - 1, dp[i] + 1);
    }
    for(int i = 1; i <= q; i++) {
        int x;
        scanf("%d", &x);
        if(dp[x] == inf)
            printf("oo\n");
        else
            printf("%d\n", dp[x]);
    }
}

Compilation message (stderr)

brunhilda.cpp: In function 'int main()':
brunhilda.cpp:53:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d%d", &m, &q);
     ~~~~~^~~~~~~~~~~~~~~~
brunhilda.cpp:60:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d", &x);
         ~~~~~^~~~~~~~~~
brunhilda.cpp:73:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d", &x);
         ~~~~~^~~~~~~~~~

• Subtask 1: 17.77777777777778 / 20
• Subtask 2: 11.11111111111111 / 20
• Subtask 3: 27.142857142857142 / 60