1 分段字符串翻转
#include "bits/stdc++.h" using namespace std; int main(){ int i,j,k,m,n; int num; cin>>n; string str; getchar(); getline(cin,str); int size = str.size(); num = size/n; //cout<<"ashdhash"; //cout<<str<<" "<<n; if(num == 0){ reverse(str.begin() ,str.end()); } else{ for(i = 0;i < num;i++){ reverse(str.begin() + i*n,str.begin() + (i + 1)*n); } reverse(str.begin() + i * n,str.end()); } cout<<str<<endl; return 0; }2 小岛连接
#include "bits/stdc++.h" using namespace std; const int maxn = 1111; int fa[maxn]; struct node{ int from,to; int w; bool operator < (const node & a) const { return w < a.w; } }p[maxn]; void init(int n){ for(int i = 0;i <= n; i++){ fa[i] = i; } } int find_fa(int x){ return fa[x] == x ? fa[x] :fa[x] = find_fa(fa[x]); } int kruakal(int n,int num){ int ans = 0; int cnt = 0; int i,j,k; for(i = 0; i < num; i++){ int fx = find_fa(p[i].from); int fy = find_fa(p[i].to); if(fx != fy){ fa[fx] = fy; ans += p[i].w; cnt ++; } if(cnt == n-1) break; } if(cnt < n-1){ return -1; } return ans; } int main(){ int T; scanf("%d",&T); while (T--){ int m,n,k; cin>>n>>m>>k; init(n); int num =0; int from ,to; int dis; for(int i = 0;i < m ; i++){ cin>>from >> to >>dis; if(dis <= k){ p[num].from = from; p[num].to = to ; p[num].w = dis; num++; } } sort(p, p + num); int res = kruakal(n,num); if(res < 0) cout<<"No"<<endl; else cout<<"Yes"<<endl; } return 0; }
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