Submission #200527

#	Time	Username	Problem	Language	Result	Execution time	Memory
200527		HellAngel	송금 (JOI19_remittance)	C++14	100 / 100	347 ms	36488 KiB

remittance

#include <bits/stdc++.h>
#define int long long
using namespace std;
const int maxn = 1000007;
int a[maxn], b[maxn], n;
void AnsNo()
{
    cout << "No";
    exit(0);
}
void AnsYes()
{
    cout << "Yes";
    exit(0);
}

void Change(int pos, int val)
{
    a[pos] -= 2 * val;
    pos++;
    if(pos == n) pos = 0;
    a[pos] += val;
}

int32_t main()
{
    auto start = chrono::steady_clock::now();
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    if(fopen("test.inp", "r")) freopen("test.inp", "r", stdin);
    cin >> n;
    for(int i = 0; i < n; i++) cin >> a[i] >> b[i];
    while(true)
    {
        bool ok = false;
        for(int i = 0; i < n; i++)
        {
            if(a[i] > b[i])
            {
                int nxt = a[i] - b[i] >> 1;
                if(nxt == 0 && a[i] > 1) Change(i, 1), ok = 1;
                if(nxt > 0) Change(i, nxt), ok = 1;
            }
        }
        if(!ok) break;
    }
    for(int i = 0; i < n; i++) if(a[i] != b[i]) AnsNo();
    AnsYes();
    auto finish = chrono::steady_clock::now();
    cerr << '\n'<< chrono::duration_cast<chrono::milliseconds>(finish - start).count();
}

Compilation message (stderr)

remittance.cpp: In function 'int32_t main()':
remittance.cpp:40:32: warning: suggest parentheses around '-' inside '>>' [-Wparentheses]
                 int nxt = a[i] - b[i] >> 1;
                           ~~~~~^~~~~~
remittance.cpp:30:39: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
     if(fopen("test.inp", "r")) freopen("test.inp", "r", stdin);
                                ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 15 / 15
• Subtask 2: 40 / 40
• Subtask 3: 45 / 45