제출 #157933

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
157933		PeppaPig	이상한 기계 (APIO19_strange_device)	C++14	100 / 100	872 ms	69132 KiB

strange_device

#include <bits/stdc++.h>

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

using namespace std;

const int N = 1e6+5;

int n;
long A, B, cyc, ans;
vector<pii> v;

int main() {
    scanf("%d %lld %lld", &n, &A, &B);

    bool valid = true;
    cyc = A / __gcd(B+1, A);
    if(1e18 / B < A) valid = false;
    else cyc *= B;

    for(int i = 1; i <= n; i++) {
        long l, r;
        scanf("%lld %lld", &l, &r);
        if(!valid) ans += r - l + 1;
        else {
            if(r - l + 1 >= cyc) v.emplace_back(0, 1), v.emplace_back(cyc, -1);
            else {
                l %= cyc, r %= cyc;
                v.emplace_back(l, 1);
                v.emplace_back(r + 1, -1); 
                if(l > r) {
                    v.emplace_back(0, 1);
                    v.emplace_back(cyc, -1);
                }
            }
        }
    }
    if(!valid) return !printf("%lld\n", ans);
    sort(v.begin(), v.end());
    for(int i = 0, cnt = 0; i < v.size(); ) {
        int j = i;
        for( ; v[i].x == v[j].x; j++) cnt += v[j].y;
        if(cnt) ans += v[j].x - v[i].x;
        i = j;
    }
    printf("%lld\n", ans);

    return 0;
}

컴파일 시 표준 에러 (stderr) 메시지

strange_device.cpp: In function 'int main()':
strange_device.cpp:43:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i = 0, cnt = 0; i < v.size(); ) {
                             ~~^~~~~~~~~~
strange_device.cpp:17:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d %lld %lld", &n, &A, &B);
     ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
strange_device.cpp:26:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%lld %lld", &l, &r);
         ~~~~~^~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 5 / 5
• Subtask 3: 5 / 5
• Subtask 4: 5 / 5
• Subtask 5: 5 / 5
• Subtask 6: 20 / 20
• Subtask 7: 20 / 20
• Subtask 8: 30 / 30