Submission #483154

#	Time	Username	Problem	Language	Result	Execution time	Memory
483154		kawaii	Cake 3 (JOI19_cake3)	C++17	0 / 100	2 ms	588 KiB

cake3

#pragma GCC optimize("Ofast")
#pragma GCC optimization ("unroll-loops")
#include <bits/stdc++.h>
using namespace std;
#define int long long

int n, m, v[1000005], c[1000005], ans = 0;
struct num{
    int diff, V, C;
    num();
    num(int A, int B, int D){
        diff = A, V = B, C = D;
    }
};

bool operator < (num a, num b){
    return a.diff < b.diff;
}

vector<num> vec;
vector<int> p;
void solve(){  
    sort(vec.begin(), vec.end());
    for(int i = vec.size() - 1; i >= vec.size() - m; i--){
        ans += vec[i].V;
        p.push_back(vec[i].C);
    }
    sort(p.begin(), p.end());
    for(int i = 0; i < p.size(); i++){
        if(i == 0) ans -= abs(p[i] - p.back());
        else ans -= abs(p[i] - p[i - 1]);
    }
    cout << ans;
}

signed main(){ 
    freopen("cake3.inp", "r", stdin);
    freopen("cake3.out", "w", stdout);
    ios_base::sync_with_stdio(NULL); cin.tie(nullptr); cout.tie(nullptr);
    cin >> n >> m;
    for(int i = 1; i <= n; i++){
        cin >> v[i] >> c[i];  
        vec.push_back(num(v[i] - c[i], v[i], c[i]));
    }
    solve();
}

Compilation message (stderr)

cake3.cpp:2: warning: ignoring '#pragma GCC optimization' [-Wunknown-pragmas]
    2 | #pragma GCC optimization ("unroll-loops")
      | 
cake3.cpp: In function 'void solve()':
cake3.cpp:24:35: warning: comparison of integer expressions of different signedness: 'long long int' and 'long long unsigned int' [-Wsign-compare]
   24 |     for(int i = vec.size() - 1; i >= vec.size() - m; i--){
      |                                 ~~^~~~~~~~~~~~~~~~~
cake3.cpp:29:22: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   29 |     for(int i = 0; i < p.size(); i++){
      |                    ~~^~~~~~~~~~
cake3.cpp: In function 'int main()':
cake3.cpp:37:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   37 |     freopen("cake3.inp", "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
cake3.cpp:38:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   38 |     freopen("cake3.out", "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 5
• Subtask 2: 0 / 19
• Subtask 3: 0 / 76