Submission #1559184

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Source Code Expand

#include<stdio.h>
#include<iostream>
#include<string.h>
#include<string>
#include<ctype.h>
#include<math.h>
#include<set>
#include<map>
#include<vector>
#include<queue>
#include<bitset>
#include<algorithm>
#include<time.h>
using namespace std;
void fre() { freopen("c://test//input.in", "r", stdin); freopen("c://test//output.out", "w", stdout); }
#define MS(x, y) memset(x, y, sizeof(x))
#define ls o<<1
#define rs o<<1|1
typedef long long LL;
typedef unsigned long long UL;
typedef unsigned int UI;
template <class T1, class T2>inline void gmax(T1 &a, T2 b) { if (b > a)a = b; }
template <class T1, class T2>inline void gmin(T1 &a, T2 b) { if (b < a)a = b; }
const int N = 1e5 + 10, M = 0, Z = 1e9 + 7, inf = 0x3f3f3f3f;
template <class T1, class T2>inline void gadd(T1 &a, T2 b) { a = (a + b) % Z; }
int casenum, casei;
int n;
int a[N];
int main()
{
	while (~scanf("%d", &n))
	{
		for (int i = 1; i <= n; ++i)
		{
			scanf("%d", &a[i]);
		}
		int ans = 0;
		for (int i = 1; i < n; ++i)
		{
			if (a[i] == i)
			{
				swap(a[i], a[i + 1]);
				++ans;
			}
		}
		if (a[n] == n)++ans;
		printf("%d\n", ans);
	}
	return 0;
}
/*
【trick&&吐槽】


【题意】


【分析】


【时间复杂度&&优化】


*/

Submission Info

Compile Error

./Main.cpp: In function ‘void fre()’:
./Main.cpp:15:55: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result]
 void fre() { freopen("c://test//input.in", "r", stdin); freopen("c://test//output.out", "w", stdout); }
                                                       ^
./Main.cpp:15:101: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result]
 void fre() { freopen("c://test//input.in", "r", stdin); freopen("c://test//output.out", "w", stdout); }
                                                                                                     ^
./Main.cpp: In function ‘int main()’:
./Main.cpp:35:22: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
    scanf("%d", &a[i]);
                      ^

Judge Result