Submission #62948

#	Time	Username	Problem	Language	Result	Execution time	Memory
62948		win11905	Unija (COCI17_unija)	C++11	100 / 100	656 ms	58328 KiB

unija

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

#define long long long
#define pii pair<int, int>
#define x first
#define y second

int n;
vector<pii> V, A;

int main() {
    scanf("%d", &n); 
    V.reserve(n+1), A.reserve(n+1);
    for(int i = 0, a, b; i < n; ++i) {
        scanf("%d %d", &a, &b);
        V.emplace_back(a >> 1, b >> 1);
    }
    sort(V.begin(), V.end(), [&](const pii &a, const pii &b) {
        if(a.x == b.x) return a.y < b.y;
        return a.x > b.x;
    });
    A.emplace_back(V[0]);
    for(int i = 1; i < n; ++i) {
        if(V[i].y > A.back().y) A.emplace_back(V[i]);
    }
    int pv = 0;
    long sum = 0;
    for(auto x : A) {
        sum += 1ll * x.x * (x.y - pv);
        pv = x.y;
    }
    printf("%lld\n", sum << 2);
}

Compilation message (stderr)

unija.cpp: In function 'int main()':
unija.cpp:13:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d", &n); 
     ~~~~~^~~~~~~~~~
unija.cpp:16:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d %d", &a, &b);
         ~~~~~^~~~~~~~~~~~~~~~~

• 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