Submission #1667460

---

Source Code Expand

#include <cstdio>
#include <climits>
#include <algorithm>
using namespace std;

int main() {
  int N; scanf("%d", &N);
  static char S[500003];
  scanf("%500000s", S);
  // NFA for (.|1+01|101+)*
  // q0 -0-> q0 (+0)
  // q0 -1-> q0 (+0)
  // q0 -1-> q1 (+1)
  // q1 -1-> q1 (+1)
  // q1 -0-> q2 (+0)
  // q2 -1-> q0 (+0)
  // q0 -1-> q3 (+0)
  // q3 -0-> q4 (+0)
  // q4 -1-> q4 (+1)
  // q4 -1-> q0 (+1)
  int dp[5] = {0, INT_MIN, INT_MIN, INT_MIN, INT_MIN};
  for(int i = 0; i < N; ++i) {
    int dp2[5] = {dp[0], dp[1], dp[2], dp[3], dp[4]};
    if(S[i] == '0') {
      // q0 -0-> q0 (+0)
      // q1 -0-> q2 (+0)
      // q3 -0-> q4 (+0)
      dp[0] = dp2[0];
      dp[1] = INT_MIN;
      dp[2] = dp2[1];
      dp[3] = INT_MIN;
      dp[4] = dp2[3];
    } else {
      // q0 -1-> q0 (+0)
      // q2 -1-> q0 (+0)
      // q4 -1-> q0 (+1)
      // q0 -1-> q1 (+1)
      // q1 -1-> q1 (+1)
      // q0 -1-> q3 (+0)
      // q4 -1-> q4 (+1)
      dp[0] = max({dp2[0], dp2[2], dp2[4] + 1});
      dp[1] = max({dp2[0] + 1, dp2[1] + 1});
      dp[2] = INT_MIN;
      dp[3] = dp2[0];
      dp[4] = dp2[4] + 1;
    }
  }
  printf("%d\n", dp[0]);
  return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:7:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
   int N; scanf("%d", &N);
                         ^
./Main.cpp:9:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
   scanf("%500000s", S);
                       ^

Judge Result