Submission #211627

#	Time	Username	Problem	Language	Result	Execution time	Memory
211627		m3r8	Remittance (JOI19_remittance)	C++14	15 / 100	7 ms	384 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;
  int nn = 1;
  int nnn = 1;
  scanf("%d",&n);
  for(int i = 0;i<n;i++){
    scanf("%lld %lld",&A[i],&B[i]);  
    if(B[i] != 0)nn = 0;
    if(A[i] != 0)nnn = 0;
  };
  int pos = 1;
  if(nn && !nnn)pos = 0;
  if(pos){
    
    for(int j = 0;j<2;j++){
      for(int i = 0;i<n;i++){
        if(j == 1 && i == n-1)break;
        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;
        };  
      };
    };
    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++){
      //printf("%lld\n",A[i]-B[i]);
      //printf("%d\n",cnt[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:14:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d",&n);
   ~~~~~^~~~~~~~~
remittance.cpp:16:10: 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: 15 / 15
• Subtask 2: 0 / 40
• Subtask 3: 0 / 45