Submission #557022

#	Time	Username	Problem	Language	Result	Execution time	Memory
557022		Ai7081	Semiexpress (JOI17_semiexpress)	C++17	100 / 100	17 ms	340 KiB

semiexpress

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

const ll N = 3005;

ll n, m, k, s[N], ans, a, b, c, t;
priority_queue<ll, vector<ll>, greater<ll>> pq;

void add(ll x) {
    pq.push(x);
    if (pq.size() > k) pq.pop();
}

int main() {
    scanf(" %lld %lld %lld", &n, &m, &k);
    scanf(" %lld %lld %lld", &a, &b, &c);
    scanf(" %lld", &t);
    k -= m;
    for (ll i=1; i<=m; i++) scanf(" %lld", &s[i]);
    ans = (t >= b*(n-1)) - 1;
    for (ll i=1; i<m && t>=0; i++) {
        ans += min(s[i+1]-s[i]-1, t/a)+1;
        ll now = min(s[i+1], s[i]+t/a+1), pre=0, tmp=k;
        while (now < s[i+1] && tmp--) {
            pre = now;
            ll t_left = t - (pre - s[i]) * c;
            if (t_left < 0) break;
            now = min(pre + t_left/a, s[i+1]-1);
            add(now - pre + 1);
            now++;
        }
        t -= (s[i+1] - s[i]) * b;
    }
    while (!pq.empty()) ans += pq.top(), pq.pop();
    printf("%lld", ans);
    return 0;
}

Compilation message (stderr)

semiexpress.cpp: In function 'void add(long long int)':
semiexpress.cpp:12:19: warning: comparison of integer expressions of different signedness: 'std::priority_queue<long long int, std::vector<long long int>, std::greater<long long int> >::size_type' {aka 'long unsigned int'} and 'long long int' [-Wsign-compare]
   12 |     if (pq.size() > k) pq.pop();
      |         ~~~~~~~~~~^~~
semiexpress.cpp: In function 'int main()':
semiexpress.cpp:16:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   16 |     scanf(" %lld %lld %lld", &n, &m, &k);
      |     ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
semiexpress.cpp:17:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   17 |     scanf(" %lld %lld %lld", &a, &b, &c);
      |     ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
semiexpress.cpp:18:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   18 |     scanf(" %lld", &t);
      |     ~~~~~^~~~~~~~~~~~~
semiexpress.cpp:20:34: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   20 |     for (ll i=1; i<=m; i++) scanf(" %lld", &s[i]);
      |                             ~~~~~^~~~~~~~~~~~~~~~

• Subtask 1: 18 / 18
• Subtask 2: 30 / 30
• Subtask 3: 52 / 52