Submission #1691486

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Source Code Expand

#include <bits/stdc++.h>
using namespace std;
 
typedef long long LL;
typedef pair<int, int> pii;
 
#define fst first
#define snd second
#define pb push_back
#define REP(i, a, b)  for(int i = (a), i##end = (b); i < i##end; ++i)
#define DREP(i, a, b) for(int i=(a-1), i##end = (b); i >=i##end; --i)
 
template <typename T> bool chkmax(T& a, T b) { return a < b ? a = b, 1 : 0; }
template <typename T> bool chkmin(T& a, T b) { return a > b ? a = b, 1 : 0; }
 
const int N = 100000;
const int oo = 0x3f3f3f3f;
 
template<typename T> T read() {
    T n(0), f(1);
    char ch = getchar();
    for(;!isdigit(ch); ch = getchar()) if(ch == '-') f = -1;
    for(; isdigit(ch); ch = getchar()) n = n * 10 + ch - 48; 
    return n * f;
}

int n;
int a[N + 5], f[N + 5][2];

int main() {
#ifdef Wearry
    freopen("data.txt", "r", stdin);
    freopen("ans.txt", "w", stdout);
#endif 

    scanf("%d", &n);
    f[1][0] = f[1][1] = 1;

    for(int i = 1; i <= n; ++i) {
        scanf("%d", a + i);
        if(i > 1) {
            f[i][1] = f[i][0] = min(f[i-1][0], f[i-1][1]) + 1;

            if(a[i] >= a[i-1]) chkmin(f[i][1], f[i-1][1]);
            if(a[i] <= a[i-1]) chkmin(f[i][0], f[i-1][0]);
        }
    }
    printf("%d\n", min(f[n][0], f[n][1]));

    return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:36:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d", &n);
                    ^
./Main.cpp:40:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d", a + i);
                           ^

Judge Result