Submission #552043

#	Time	Username	Problem	Language	Result	Execution time	Memory
552043		cheetose	Remittance (JOI19_remittance)	C++17	100 / 100	285 ms	52044 KiB

remittance

#include <bits/stdc++.h>
#define mp make_pair
#define pb push_back
#define X first
#define Y second
#define y0 y12
#define y1 y22
#define INF 1987654321
#define PI 3.141592653589793238462643383279502884
#define fup(i,a,b,c) for(int (i)=(a);(i)<=(b);(i)+=(c))
#define fdn(i,a,b,c) for(int (i)=(a);(i)>=(b);(i)-=(c))
#define MEM0(a) memset((a),0,sizeof(a))
#define MEM_1(a) memset((a),-1,sizeof(a))
#define ALL(a) a.begin(),a.end()
#define COMPRESS(a) sort(ALL(a));a.resize(unique(ALL(a))-a.begin())
#define SYNC ios_base::sync_with_stdio(false);cin.tie(0)
using namespace std;
typedef long long ll;
typedef long double ld;
typedef double db;
typedef unsigned int uint;
typedef unsigned long long ull;
typedef pair<int, int> Pi;
typedef pair<ll, ll> Pll;
typedef pair<ld, ld> Pd;
typedef vector<int> Vi;
typedef vector<ll> Vll;
typedef vector<ld> Vd;
typedef vector<Pi> VPi;
typedef vector<Pll> VPll;
typedef vector<Pd> VPd;
typedef tuple<int, int, int> iii;
typedef tuple<int, int, int, int> iiii;
typedef tuple<ll, ll, ll> LLL;
typedef vector<iii> Viii;
typedef vector<LLL> VLLL;
typedef complex<double> base;
const int MOD = 998244353;
ll POW(ll a, ll b, ll MMM = MOD) { ll ret = 1; for (; b; b >>= 1, a = (a*a) % MMM)if (b & 1)ret = (ret*a) % MMM; return ret; }
int dx[] = { 0,1,0,-1,1,1,-1,-1 }, dy[] = { 1,0,-1,0,1,-1,1,-1 };
int ddx[] = { -1,-2,1,-2,2,-1,2,1 }, ddy[] = { -2,-1,-2,1,-1,2,1,2 };

ll A[1000000],B[1000000],C[1000000];
ll t[1000000];
bool chk[1000000];
int main(){
	int n;
	scanf("%d",&n);
	fup(i,0,n-1,1){
		scanf("%lld%lld",A+i,B+i);
		C[i]=B[i]-A[i];
	}
	ll l=0,r=1e9,res=-1;
	while(l<=r){
		ll k=l+r>>1;
		t[0]=k;
		t[n-1]=2*k+C[0];
		int tt=0;
		if(t[n-1]<0){
			tt=-1;
		}
		if(t[n-1]>1e9){
			tt=1;
		}
		if(!tt){
			fdn(i,n-2,1,1){
				t[i]=t[i+1]*2+C[i+1];
				if(t[i]<0){
					tt=-1;
					break;
				}
				if(t[i]>1e9){
					tt=1;
					break;
				}
			}
			if(!tt){
				ll r=t[1]*2+C[1];
				if(r<t[0])tt=-1;
				else if(r>t[0])tt=1;
			}
		}
		if(tt==0){
			res=k;
			break;
		}
		if(tt<0)l=k+1;
		else r=k-1;
	}
	if(res<0)return !printf("No\n");
	int tt=30;
	while(tt--){
		fup(i,0,n-1,1){
			if(!t[i])continue;
			int j=i+1;
			if(j==n)j=0;
			ll mn=min(t[i],A[i]>>1);
			A[i]-=2*mn;
			t[i]-=mn;
			A[j]+=mn;
		}
	}
	fup(i,0,n-1,1){
		if(A[i]^B[i])return !printf("No\n");
	}
	puts("Yes");
}

Compilation message (stderr)

remittance.cpp: In function 'int main()':
remittance.cpp:10:30: warning: unnecessary parentheses in declaration of 'i' [-Wparentheses]
   10 | #define fup(i,a,b,c) for(int (i)=(a);(i)<=(b);(i)+=(c))
      |                              ^
remittance.cpp:49:2: note: in expansion of macro 'fup'
   49 |  fup(i,0,n-1,1){
      |  ^~~
remittance.cpp:55:9: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   55 |   ll k=l+r>>1;
      |        ~^~
remittance.cpp:11:30: warning: unnecessary parentheses in declaration of 'i' [-Wparentheses]
   11 | #define fdn(i,a,b,c) for(int (i)=(a);(i)>=(b);(i)-=(c))
      |                              ^
remittance.cpp:66:4: note: in expansion of macro 'fdn'
   66 |    fdn(i,n-2,1,1){
      |    ^~~
remittance.cpp:10:30: warning: unnecessary parentheses in declaration of 'i' [-Wparentheses]
   10 | #define fup(i,a,b,c) for(int (i)=(a);(i)<=(b);(i)+=(c))
      |                              ^
remittance.cpp:93:3: note: in expansion of macro 'fup'
   93 |   fup(i,0,n-1,1){
      |   ^~~
remittance.cpp:10:30: warning: unnecessary parentheses in declaration of 'i' [-Wparentheses]
   10 | #define fup(i,a,b,c) for(int (i)=(a);(i)<=(b);(i)+=(c))
      |                              ^
remittance.cpp:103:2: note: in expansion of macro 'fup'
  103 |  fup(i,0,n-1,1){
      |  ^~~
remittance.cpp:48:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   48 |  scanf("%d",&n);
      |  ~~~~~^~~~~~~~~
remittance.cpp:50:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   50 |   scanf("%lld%lld",A+i,B+i);
      |   ~~~~~^~~~~~~~~~~~~~~~~~~~

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