Submission #212051

#	Time	Username	Problem	Language	Result	Execution time	Memory
212051		PeppaPig	Taxis (POI13_tak)	C++14	100 / 100	194 ms	13700 KiB

tak

#include <bits/stdc++.h>

#define long long long

using namespace std;

const int N = 5e5+5;

long m, d;
int n;
vector<long> vec;

int main() {
    scanf("%lld %lld %d", &m, &d, &n);
    for(int i = 1; i <= n; i++) {
        long a;
        scanf("%lld", &a);
        vec.emplace_back(a);
    }
    sort(vec.begin(), vec.end(), greater<long>());
    int idx = upper_bound(vec.begin(), vec.end(), m - d, greater<long>()) - vec.begin() - 1;
    if(idx < 0) return !printf("0\n");

    long pos = 0;
    for(int i = 0; i < idx; i++) {
        pos += max(0ll, vec[i] - abs(d - pos));
        if(pos >= m) 
            return !printf("%d\n", i + 1);
    }
    if(pos + max(0ll, vec[idx] - abs(d - pos)) >= m)
        return !printf("%d\n", idx + 1);
    for(int i = idx + 1; i < n; i++) {
        pos += max(0ll, vec[i] - abs(d - pos));
        if(pos + max(0ll, vec[idx] - abs(d - pos)) >= m)
            return !printf("%d\n", i + 1);
    }
    printf("0\n");

    return 0;
}

Compilation message (stderr)

tak.cpp: In function 'int main()':
tak.cpp:14:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%lld %lld %d", &m, &d, &n);
     ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
tak.cpp:17:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%lld", &a);
         ~~~~~^~~~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 10 / 10
• Subtask 3: 10 / 10
• Subtask 4: 10 / 10
• Subtask 5: 10 / 10
• Subtask 6: 10 / 10
• Subtask 7: 10 / 10
• Subtask 8: 10 / 10
• Subtask 9: 10 / 10
• Subtask 10: 10 / 10