Submission #211612

#	Time	Username	Problem	Language	Result	Execution time	Memory
211612		m3r8	Remittance (JOI19_remittance)	C++14	0 / 100	5 ms	432 KiB

remittance

#include <stdio.h>

#define N 1000100
#define ll long long

ll A[N];
ll B[N];
int cnt[N];

int main(void){
  int n;
  scanf("%d",&n);
  for(int i = 0;i<n;i++){
    scanf("%lld %lld",&A[i],&B[i]);  
  };
  for(int j = 0;j<2;j++){
    for(int i = 0;i<n;i++){
      if(A[i] > B[i]){
        ll tmp = A[i]-B[i];
        if(tmp % 2)tmp--;
        tmp /= 2;
        A[(i+1)%n] += tmp; 
        A[i] -= tmp * 2;
      };  
    };
  };
  int pos = 1;
  for(int i = 0;i<n;i++){
    ll diff = A[i]-B[i];  
    pos = diff >= 0;
    if(!pos)break;
    for(int j = 0;j<32;j++){
      if(diff & (1ull << j)){
        cnt[(i+j)%n] ^= 1;
      };
    };
  };
  if(pos){
    int st = cnt[0];
    for(int i = 0;i<n;i++){
      if(cnt[i] != st){
        pos = 0;  
        break;
      };
    };
  };
  if(pos)printf("Yes\n");
  else printf("No\n");
  return 0;
};

Compilation message (stderr)

remittance.cpp: In function 'int main()':
remittance.cpp:12:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d",&n);
   ~~~~~^~~~~~~~~
remittance.cpp:14:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%lld %lld",&A[i],&B[i]);  
     ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 15
• Subtask 2: 0 / 40
• Subtask 3: 0 / 45