Submission #1604380

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Source Code Expand

#include <ctime>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <cassert>
#include <algorithm>
#include <iostream>
#include <vector>
#include <queue>
#include <stack>
#include <deque>
#include <set>
#include <map>
using namespace std;

typedef long long ll;
typedef double lf;
typedef long double Lf;
typedef pair <int,int> pii;
typedef pair <ll, ll> pll;

#define TRACE(x) cerr << #x << "  " << x << endl
#define FOR(i, a, b) for (int i = (a); i < int(b); i++)
#define REP(i, n) FOR(i, 0, n)
#define all(x) (x).begin(), (x).end()
#define _ << " " <<

#define fi first
#define sec second
#define mp make_pair

const int MAXN = 100100;

int n, pref[MAXN], suff[MAXN];

char s[MAXN];

ll sum;

int main() {
  scanf("%s",s);
  n = strlen(s);
  pref[0] = 0;
  suff[n - 1] = n - 1;
  FOR(i, 1, n) pref[i] = (s[i] == 'U') ? i : pref[i - 1];
  for (int i = n - 2; i >= 0; i--) suff[i] = (s[i] == 'D') ? i : suff[i + 1];

  sum += 2 * (n - 1);
  FOR(i, 1, n - 1) {
    sum += (pref[i] == i) ? n - i - 1 : 2 * (n - i - 1);
    sum += (suff[i] == i) ? i : 2 * i;
  }

  printf("%lld\n",sum);
  return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:41:16: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
   scanf("%s",s);
                ^

Judge Result