HDU 4928 Series 2

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有了題解以後這題就成了一個類比題。不過寫了好久才把它寫對…… Sad

#include <iostream>#include <cstdio>#include <cstring>#include <cstdlib>#include <cmath>#include <algorithm>#include <string>#include <queue>#include <stack>#include <vector>#include <map>#include <set>#include <functional>#include <time.h>using namespace std;typedef __int64 ll;const int INF = 1<<30;const int MAXN = (int) 1e5+55;ll a[MAXN];int n;inline int check(ll A[], int len) {    bool INC = true, DEC = true;    for (int i = 0; i < len-1; i++)        if (A[i+1]>A[i]) INC = false;        else if (A[i+1]<A[i]) DEC = false;    return INC||DEC;}int solve() {    int cur = 0;    int l = 0, r = n-1;    for (int i = 0; i < n; i++) {        while (l<r && a[l]==0) l++;        while (l<r && a[r]==0) r--;        l = max(0, l-1);        r = min(r+1, n-i);        if (!check(a+l, r-l)) return i;        for (int j = l; j < r; j++)            a[j] = a[j+1]-a[j];        r--;    }    return n;}int main() {    #ifdef Phantom01        freopen("HDU4928.txt", "r", stdin);    #endif //Phantom01    int T;    scanf("%d", &T);    while (T--) {        scanf("%d", &n);        for (int i = 0; i < n; i++)            scanf("%I64d", &a[i]);        int ans = solve();        if (0==ans) puts("ugly series");        else if (n==ans) puts("nice series");        else printf("%d\n", ans-1);    }    return 0;}

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