刷题证明
| A |
CodeForces 1611B |
Team Composition: Programmers and Mathematicians |
#include<iostream> #include<algorithm> using namespace std; int main() { int t, n, m; cin >> t; while (t--) { cin >> n >> m; if (n > m) { int temp = m; m = n; n = temp; } int ans = min(n, min(m, (n m) / 4)); cout << ans << endl; }
#include<bits/stdc .h> #include<map> using namespace std; int main() { string s; map<char, int>mp; cin >> s; for (int i = 0; i <s.size(); i ) { mp[s[i]] ; } for (int i = 'z'; i >= 'a'; i--) { if (mp[i] != 0) { for (int j = 0; j <mp[i];j ) { cout << (char)i; } return 0; } } return 0; }
| C |
CodeForces 1138A |
Sushi for Two |
#include<bits/stdc .h> using namespace std; int arr[100005]; int main() { int n, ans = 0; cin >> n; for (int i = 0; i < n; i ) { cin >> arr[i]; } int sit = arr[0], cnt1 = 0, cnt2 = 0; if (arr[0] == 1)cnt1 = 1; else cnt2 = 1; for (int i = 1; i < n; i ) { if (sit != arr[i]) { ans = max(ans, min(cnt1, cnt2)；//记录前两次的最小值 if (sit == 1)cnt2 = 1; else cnt1 = 1; sit = arr[i]; } else { if (sit == 1)cnt1 ; else cnt2 ; } } ans = max(ans, min(cnt1, cnt2)); printf("%d", ans * 2); return 0; }
| D |
CodeForces 1605A |
A.M. Deviation |
#include<bits/stdc .h> using namespace std; int main() { long long a, b, c; int t; cin >> t; while (t--) { cin >> a >> b >> c; if (abs((a c - 2 * b) % 3) == 0) { printf("0\n"); } else printf("1\n"); } return 0; }
| E |
CodeForces 1606A |
AB Balance |
#include<bits/stdc .h> using namespace std; int main() { int t; cin >> t; char s[105] = { '0'}; while (t--) { cin >> s; int ab[105] = { 0 }, ba[105] = { 0 }; int sit = s[0]; int abcnt = 0, bacnt = 0; for (int i = 1; i <strlen(s); i ) { if (s[i] != sit && s[i] == 'b') { abcnt ; ab[abcnt] = i; sit = 'b'; continue; } if (s[i] != sit && s[i] == 'a') { bacnt ; ba[bacnt] = i; sit = 'a'; continue; } } if (abcnt==bacnt) { printf("%s\n", s); } else if (abcnt>bacnt) { if (abcnt = 1 && strlen(s) != 1) { s[0] = 'b'; printf("%s\n", s); continue; } for (int i = 1;i<=abcnt-bacnt;i ) { s[ab[i]-1] ='b'; } printf("%s\n", s); } else { if (bacnt = 1 && strlen(s) != 1) { s[0] = 'a'; printf("%s\n", s); continue; } for (int i =1;i<=bacnt-abcnt;i ) { s[ba[i]-1]='a'; } printf("%s\n", s); } } return 0; }
| F |
CodeForces 1594A |
Cnsecutive Sum Riddle |
#include<bits/stdc++.h>
using namespace std;
int main()
{
int t;
cin >> t;
long long n;
while (t--)
{
cin >> n;
cout << -n + 1 << " " << n << endl;
}
}
#include<bits/stdc++.h>
using namespace std;
int main()
{
int t;
cin >> t;
while (t--)
{
int n, ans = 0, a;
cin >> n;
for (int i = 1; i <= n; i++)
{
cin >> a;
if (a > ans + i)
{
ans += a - ans - i;
}
}
cout << ans << endl;
}
return 0;
}
| H |
CodeForces 1583A |
Windblume Ode |
#include<bits/stdc++.h>
using namespace std;
bool prime(int a)
{
for (int i = 2; i <= sqrt(a); i++)
{
if ((a % i) == 0)
{
return 1;
}
}
return 0;
}
int main()
{
int t, n;
cin >> t;
while (t--)
{
int sum = 0, x=0, pos=0;
int arr[205] = { 0 };
cin >> n;
for (int i = 0; i < n; i++)
{
cin >> x;
arr[i] = x;
sum += arr[i];
if ((arr[i] % 2 )!= 0)
{
pos = i;
}
}
if (prime(sum)==1)
{
cout << n << endl;
for (int i = 1; i <= n; i++)
{
cout << i << " ";
}
}
else
{
cout << n - 1 << endl;
for (int i = 1; i <= n; i++)
{
if (i ==(pos+1))
{
continue;
}
cout << i << " ";
}
}
cout << endl;
}
return 0;
}
| I |
CodeForces 166A |
Rank List |
#include<bits/stdc++.h>
using namespace std;
long long arr[30][30];
int main()
{
int m, x;
cin >> m >> x;
for (int i = 0; i < m; i++)
{
for (int j = 0; j < 2; j++)
{
cin >> arr[i][j];
}
}
for (int i = m-1; i >0; i--)
{
for (int j = 0; j <= i - 1; j++)
{
if (arr[j][0] <arr[j + 1][0])
{
swap(arr[j][0], arr[j + 1][0]);
swap(arr[j][1], arr[j + 1][1]);
}
}
}
for (int i = m - 1; i > 0; i--)
{
for (int j = 0; j <= i - 1; j++)
{
if (arr[j][1] > arr[j + 1][1]&&arr[j][0]==arr[j+1][0])
{
swap(arr[j][1], arr[j + 1][1]);
swap(arr[j][0], arr[j + 1][0]);
}
}
}
int ans = 0;
for (int i = 0; i < m; i++)
{
if (arr[i][0] == arr[x-1][0] && arr[i][1] == arr[x-1][1])
{
ans++;
}
}
cout << ans << endl;
}