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A题:Stair, Peak, or Neither?
AC代码:
#include<iostream>
#include<cstring>using namespace std;int main()
{int t;cin >> t;while(t--){int a,b,c;cin >> a >> b >> c;if(a < b && b < c){puts("STAIR"); }else if(a < b && b > c){puts("PEAK"); }else{puts("NONE"); } }return 0;
}
B题:Upscaling
AC代码:
#include<iostream>using namespace std;int main()
{int t;cin >> t;while(t--){int n;cin >> n;if(n == 1){printf("##\n##\n");}else{for(int i=1;i<=n;i++){if(i%2!=0){for(int j=1;j<=2;j++){int a=0,b=0,w=0;for(int k=1;k<=2*n;k++){if(a == 2) a = 0,w = 1;if(b == 2) b = 0,w = 0;if(a!=2&&!w){printf("#");a++;}else if(b!=2&&w){printf(".");b++; }}puts("");}}else{for(int j=1;j<=2;j++){int a=0,b=0,w=0;for(int k=1;k<=2*n;k++){if(a == 2) a = 0,w = 1;if(b == 2) b = 0,w = 0;if(a!=2&&!w){printf(".");a++;}else if(b!=2&&w){printf("#");b++; }}puts("");}}}}}return 0;
}
此题找规律即可
C题: Clock Conversion
AC代码:
#include<iostream>
#include<map>
#include<cstring>using namespace std;int main()
{map<int,int> mp{{13,1},{14,2},{15,3},{16,4},{17,5},{18,6},{19,7},{20,8},{21,9},{22,10},{23,11},{0,12}};int t;cin >> t;while(t--){string str;cin >> str;int hh = stoi(str.substr(0,2));int mm = stoi(str.substr(3,5));//cout << hh << ' ' << mm << endl;if(hh <= 12){if(hh == 12) {printf("%02d:%02d PM\n",hh,mm);continue;}if(hh == 0) hh = mp[hh];printf("%02d:%02d AM\n",hh,mm);}else{hh = mp[hh];printf("%02d:%02d PM\n",hh,mm);} }return 0;
}
此题直接暴力打表即可
D题: D. Product of Binary Decimals
AC代码:
#include<iostream>using namespace std;//打表
int num[31] = {10, 11, 100, 101, 110, 111, 1000, 1001, 1010, 1011, 1100, 1101, 1110, 1111, 10000,
10001, 10010, 10011, 10100, 10101, 10110, 10111, 11000, 11001, 11010,
11011, 11100, 11101, 11110, 11111, 100000};bool check(int n)
{int c = 0;while(n){c = n % 10;if(c != 0 && c != 1) return false;n = n / 10;}return true;
}int main()
{int t;cin >> t;while(t--){int n;cin >> n;int cop = n;if(n==1) {puts("YES");continue;}int i;for(i=0;i<30;i++){while(cop%num[i] == 0){cop = cop / num[i];}if(!check(cop)) cop = n;else break;}if(i<30) puts("YES");else puts("NO");}return 0;
}
此题同样打表即可
E题: Nearly Shortest Repeating Substring
思路
此题是一道字符串的+约数的题,时间复杂度为O(logN) * O(N),因为此题说s由x个k组成,S串中最多有一个字符不同,所以k肯定是S串长度的约数,所以只需要找S的约束串长度进行一 一 枚举比较即可
AC代码:
#include<iostream>
#include<cstring>using namespace std;int n,ans;
string str;bool check(int len)
{string s1,s2;//求出截取的字符串 for(int i=0;i<len;i++){s1 += str[i];}//如果长度够用,往后再挪动len位 if(len < str.size()){for(int i=len;i<len*2;i++){s2 += str[i]; }}int cnt1=0;int cnt2=0;for(int i=0;i<str.size();i++){int now = i % len;//周期为len所以直接%就好if(s1[now] != str[i]){cnt1++;}if(cnt1 > 1) break;}if(cnt1 <= 1) return true;for(int i=0;i<str.size();i++){int now = i % len;//周期为len所以直接%就好 if(s2[now] != str[i]){cnt2++; }if(cnt2 > 1) break;}if(cnt2 <= 1) return true;return false;
}int main()
{int t;cin >> t;while(t--){bool flag = false;int len=0,one=0,two=0;cin >> n >> str;ans = n;//如果没有满足就输出字符串本身长度 for(int i=1;i*i<=n;i++){if(n % i == 0){//两个约数 one = i;two = n / i;}//这里是最短的情况 if(check(one)){cout << one << endl;flag = true;break;}if(one != two){//two不一定是最短的所以要拿ans先存一下 if(check(two)){ans = two;}}}if(!flag) cout << ans << endl;}return 0;
}
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