Submission #2127704

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Source Code Expand

#pragma optimization_level 3

#include <vector>
#include <iostream>
using namespace std;

#define LL long long

inline LL S(LL p, LL q){
  while(true){
    if(q<0) return 0;
    if(p==0) return 1;
    q = (q>>1) - (p&q&1);
    p = p>>1;
  }
}

void solve(long long M, vector<long long> v, vector<long long> L){
  LL N = 0;
  for(LL m=0; m<M; m++) N += L[m];
  LL p=(N-1)>>1;

  LL rst=0, q=-1, prevS=S(p, q);
  for(LL m=0; m<M; m++){
    q += L[m];
    LL nextS = S(p, q);
    if(nextS != prevS) rst ^= v[m];
    prevS = nextS;
  }
  cout << rst << endl;
}

int main(){	
	long long M;
	scanf("%lld",&M);
	vector<long long> L(M-1+1);
	vector<long long> v(M-1+1);
	for(LL i = 0 ; i <= M-1 ; i++){
		scanf("%lld",&v[i]);
		scanf("%lld",&L[i]);
	}
	solve(M, v, L);
	return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:35:18: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  scanf("%lld",&M);
                  ^
./Main.cpp:39:22: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
   scanf("%lld",&v[i]);
                      ^
./Main.cpp:40:22: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
   scanf("%lld",&L[i]);
                      ^

Judge Result