Submission #1284329

#	Time	Username	Problem	Language	Result	Execution time	Memory
1284329		minhjulzi	Remittance (JOI19_remittance)	C++17	100 / 100	143 ms	8256 KiB

remittance

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

#define task "task"
#define bit(x, i) ((x >> i) & 1)

// https://trap.jp/post/1224/
#define FOR1(i, a, b) for(int i = (a), _b = (b); i <= _b; i ++)
#define FOR2(i, a, b, c) for(int i = (a), _b = (b); i <= _b; i += c)
#define FORD1(i, a, b) for(int i = (a), _b = (b); i >= _b; i --)
#define FORD2(i, a, b, c) for(int i = (a), _b = (b); i >= _b; i -= c)
#define overload4(a, b, c, d, name, ...) name
#define FOR(...) overload4(__VA_ARGS__, FOR2, FOR1)(__VA_ARGS__)
#define FORD(...) overload4(__VA_ARGS__, FORD2, FORD1)(__VA_ARGS__)

#define pb emplace_back
#define pf emplace_front
#define mp make_pair
#define fi first
#define se second

using ll = long long;
using pii = pair<int, int>;
using pll = pair<ll, ll>;
using vi = vector<int>;
using vl = vector<ll>;
// mt19937 rd(chrono::steady_clock::now().time_since_epoch().count());
// ll rand(ll l, ll r) { assert(l <= r); return uniform_int_distribution<ll>(l, r)(rd); }
const int N = 1e6 + 5;
const ll inf = 1e18;
const int mod = 1e9 + 7;
const int base = 31;
int n, a[N], b[N];
ll sum[2];
void solve(){
    cin>>n;
    FOR(i, 1, n) cin>>a[i]>>b[i], sum[0] += a[i], sum[1] += b[i];
    if(!sum[1]) return cout<<(!sum[0] ? "Yes" : "No"), void();
    ll rem = 0;
    bool sus = 1;
    while(sus){
        sus = 0;
        FOR(i, 1, n){
            a[i] += rem;
            if(a[i] > b[i]) rem = (a[i] - b[i] + 1) / 2, sus = 1;
            else rem = 0;
            a[i] -= rem * 2;
        }
    }
    FOR(i, 1, n) if(a[i] != b[i]) return cout<<"No", void();
    cout<<"Yes";
}
signed main(){
    ios::sync_with_stdio(false);
    cin.tie(NULL);
    if(fopen(task".inp", "r")){
        freopen(task".inp", "r", stdin);
        freopen(task".out", "w", stdout);
    }
    int nTest = 1;
    // cin>>nTest;
    while(nTest --) solve();
    cerr << "\nTime: " << 1.0 * clock() / CLOCKS_PER_SEC << "s\n";
    return 0;
}
/*



*/

Compilation message (stderr)

remittance.cpp: In function 'int main()':
remittance.cpp:57:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   57 |         freopen(task".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
remittance.cpp:58:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   58 |         freopen(task".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

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