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2730
进制转换,电脑自带计算器即可完成
十进制下输入2022,十六进制为7E6,那么只需十六进制下输入AAA找到对应的十进制数即可
#include<iostream> using namespace std; bool check(int x) { while(x) { if(x % 16 >= 10 && x % 16 <= 15); else return false; x /= 16; } return true; } int main() { for(int i = 2023; ; i ++) { if(check(i)) { cout << i; return 0; } } return 0; }
BYT
26进制,最简单的方法Excel表拉一下即可
#include<iostream> using namespace std; char ch[26] = {'A' , 'B' , 'C' , 'D' , 'E' , 'F' , 'G' , 'H' , 'I' , 'J' , 'K' , 'L' , 'M' , 'N' , 'O' , 'P' , 'Q' , 'R' , 'S' , 'T' , 'U' , 'V' , 'W' , 'X' , 'Y' , 'Z'}; int a[5]; int main() { int x = 2022; int j = 0; while(x) { a[j ++] = x % 26; x /= 26; } while(j --) cout << ch[a[j] - 1]; return 0; }
70910
模拟即可,注意闰年判断,日期合法
#include<iostream> using namespace std; typedef long long ll; int month[13] = {0 , 31 , 28 , 31 , 30 , 31 , 30 , 31 , 31 , 30 , 31 , 30 , 31}; ll ans;//计数 bool is_leap(int year)//判断闰年 { return (year % 4 == 0 && year % 100 != 0) || (year % 400 == 0); } int get(int x)//得到数位和 { int n = 0; while(x) { n += x % 10; x /= 10; } return n; } bool check(int y , int m , int d)//判断是否成立 { if(get(y) == (get(m) + get(d))) return true; else return false; } int main() { for(int i = 1900; i <= 9999; i ++) for(int j = 1; j <= 12; j ++) { int l = month[j]; if(is_leap(i) && j == 2) l ++; for(int k = 1; k <= l; k ++) if(check(i , j , k)) ans ++; } cout << ans; return 0; }
189
枚举即可
#include<iostream> using namespace std; int nums[31] = {0, 99, 22, 51, 63, 72, 61, 20, 88, 40, 21, 63, 30, 11, 18, 99, 12, 93, 16, 7, 53, 64, 9, 28, 84, 34, 96, 52, 82, 51, 77}; int ans; int main() { for(int i = 1; i <= 30; i ++) for(int j = i + 1; j <= 30; j ++) if(nums[i] * nums[j] >= 2022) ans ++; cout << ans ; return 0; }
148
暴搜即可
模拟即可
#include <iostream> using namespace std; int w , n; int main() { cin >> w >> n; if((w + n) % 7) cout << (w + n) % 7; else cout << 7; return 0; }
两点之间的距离≤半径
#include <cmath> using namespace std; int num[105][105]; int W, H, n, R; int ans; double distance(int x1, int y1, int x2, int y2) { return sqrt((x1 - x2) * (x1 - x2) + (y1 - y2) * (y1 - y2)); } int main() { cin >> W >> H >> n >> R; while(n --) { int x, y; cin >> x >> y; for (int i = x - R; i <= x + R; i ++) for (int j = y - R; j <= y + R; j ++) if (i >= 0 && i <= W && j >= 0 && j <= H && distance(x, y, i, j) <= R) num[i][j] = 1; } for (int i = 0; i <= W; i++) for (int j = 0; j <= H; j++) if (num[i][j] == 1) ans ++; cout << ans << endl; return 0; }
字符串转化为小写,对比一下即可
#include <iostream> #include <cstring> using namespace std; string s1; int main() { cin >> s1; string s2 = "lanqiao"; for(int i = 0; i < s1.size(); i ++) s1[i] = tolower(s1[i]); if(s1.size() == s2.size() && s2 == s1) cout << "yes"; else cout << "no"; return 0; }
考查二维差分,数据量比较小暴力也能做
#include<iostream> using namespace std; int W , H , n; int num[110][110]; int ans; int main() { cin >> W >> H >> n; while(n --) { int x1 , y1 , x2 , y2; cin >> x1 >> y1 >> x2 >> y2; for(int i = x1; i <= x2 ; i ++) for(int j = y1 ; j <= y2; j ++) { if(num[i][j] == 0) { num[i][j] = 1; ans ++; } } } cout << W * H - ans; return 0; }
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