1.判断命名是否合法
#include <bits/stdc++.h> using namespace std; int n, m; int ans; char s[10005]; bool num(char c){ return c>='0' && c<='9'; } bool A(char c){ return c>='A' && c<='Z'; } bool a(char c){ return c>='a' && c<='z'; } bool f(){ int l = strlen(s); int f = false; for(int i = 0 ; i < l ; i++){ if(!A(s[i]) && !a(s[i]) && !num(s[i])) return false; if(i==0 && num(s[i])) return false; if(num(s[i])){ f = true; } } return f; } int main() { scanf("%d", &n); while(n--){ scanf("%s", s); if(f()) printf("Accept\n"); else printf("Wrong\n"); } return 0; }
#include <bits/stdc++.h> using namespace std; int n, m; int ans; struct Node{ int id, w; Node(){} Node(int i, int w):id(i), w(w){} bool operator<(const Node a) const{ if(w == a.w) return id < a.id; return w > a.w; } }; Node a[100005]; int main() { int v, w; scanf("%d %d", &n, &m); for(int i = 0 ; i < n ; i++){ scanf("%d %d", &v, &w); a[i].id = i+1; a[i].w = v + w*2; } sort(a, a+n); vector<int> ans; for(int i = 0 ; i < m ; i++) ans.push_back(a[i].id); sort(ans.begin(), ans.end()); for(int i = 0 ; i < m ; i++){ printf("%d%c", ans[i], i==m-1?'\n':' '); } return 0; }
#define MAXN 50005 int a[MAXN]; int b[MAXN]; int sum[MAXN]; int ans[MAXN]; class UnionFind{ public: int n, count; vector<int> father; UnionFind(int num){ n = count = num; father.resize(n); for(int i = 0 ; i < n ; i++) father[i] = i; } int find(int x){ if(father[x] == x) return x; return find(father[x]); } }; int main() { scanf("%d", &n); for(int i = 0 ; i < n ; i++) scanf("%d", &a[i]); for(int i = 0 ; i < n ; i++) scanf("%d", &b[i]); ans[n-1] = 0; int mmax = 0; UnionFind u(n); for(int i = n-1 ; i >= 0 ; i--){ int id = b[i] - 1; sum[id]+= a[id]; if(id > 0 && sum[id-1] > 0){ int x = u.find(id); int y = u.find(id - 1); if(x != y){ sum[x] += sum[y]; u.father[y] = x; } } if(id < n-1 && sum[id+1] > 0){ int x = u.find(id); int y = u.find(id + 1); if(x != y){ sum[x] += sum[y]; u.father[y] = x; } } mmax = max(mmax, sum[u.find(id)]); if(i > 0) ans[i-1] = mmax; } for(int i = 0 ; i < n ; i++) printf("%d\n", ans[i]); return 0; }
4. 感觉之前见过,还是不会...
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