Submission #433088

#	Time	Username	Problem	Language	Result	Execution time	Memory
433088		ly20	Hiring (IOI09_hiring)	C++17	100 / 100	1094 ms	24900 KiB

hiring

#include <bits/stdc++.h>
using namespace std;
const int MAXN = 512345;
long long s[MAXN], q[MAXN];
int id[MAXN];
bool cmp(int a, int b) {
    return s[a] * q[b] < s[b] * q[a];
}
int main() {
    int n;
    long long w;
    scanf("%d %lld", &n, &w);
    for(int i = 0; i < n; i++) {
            id[i] = i;
        scanf("%lld %lld", &s[i], &q[i]);
    }
    sort(id, id + n, cmp);
    set <pair <long long, int> > s1;
    int resp = -1, id1 = 0;
    long long sum = 0;
    long long ccur = 0, cst = 0, qt = 1;
    for(int i = 0; i < n; i++) {
        //printf("oi\n");
        int cur = id[i];
        sum += q[cur];
        long long mn = s[cur];
        s1.insert(make_pair(q[cur],cur));
        while(sum * mn > w * q[cur]) {
            sum -= (*(--s1.end())).first;
            s1.erase(--s1.end());
        }
        ccur = sum * mn;
        //printf("%d %d\n", s1.size(), resp);
        if((int) s1.size() > resp || ((int) s1.size() == resp && cst * q[cur] > ccur * qt)) {
                //printf("oi\n");
            resp = s1.size();
            qt = q[cur];
            cst = ccur;
            id1 = i;
        }
    }
    //printf("%d\n", resp);
    s1.clear();
    sum = 0;
    for(int i = 0; i <= id1; i++) {
        int cur = id[i];
        sum += q[cur];
        long long mn = s[cur];
        s1.insert(make_pair(q[cur],cur));
        while(sum * mn > w * q[cur]) {
            sum -= (*(--s1.end())).first;
            s1.erase(--s1.end());
        }
    }
    printf("%d\n", s1.size());
    vector <int> rsp;
    while(!s1.empty()) {
        rsp.push_back((*s1.begin()).second + 1);
        s1.erase(s1.begin());
    }
    sort(rsp.begin(), rsp.end());
    for(int i = 0; i < rsp.size(); i++) {
        printf("%d\n", rsp[i]);
    }
    return 0;
}

Compilation message (stderr)

hiring.cpp: In function 'int main()':
hiring.cpp:55:14: warning: format '%d' expects argument of type 'int', but argument 2 has type 'std::set<std::pair<long long int, int> >::size_type' {aka 'long unsigned int'} [-Wformat=]
   55 |     printf("%d\n", s1.size());
      |             ~^     ~~~~~~~~~
      |              |            |
      |              int          std::set<std::pair<long long int, int> >::size_type {aka long unsigned int}
      |             %ld
hiring.cpp:62:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   62 |     for(int i = 0; i < rsp.size(); i++) {
      |                    ~~^~~~~~~~~~~~
hiring.cpp:12:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   12 |     scanf("%d %lld", &n, &w);
      |     ~~~~~^~~~~~~~~~~~~~~~~~~
hiring.cpp:15:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   15 |         scanf("%lld %lld", &s[i], &q[i]);
      |         ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 30 / 30
• Subtask 2: 28 / 28
• Subtask 3: 6 / 6
• Subtask 4: 6 / 6
• Subtask 5: 6 / 6
• Subtask 6: 6 / 6
• Subtask 7: 6 / 6
• Subtask 8: 6 / 6
• Subtask 9: 6 / 6