美团8.15笔试
1.1-n排列
#include<bits/stdc++.h> using namespace std; #define ll long long ll n,m,k; string solve() { cin >> n; map<int,int> mp; for(int i=0;i<n;i++) { cin >> k; mp[k] = 1; } for(int i=1;i<=n;i++) { if(mp[i]==0) return "No"; } return "Yes"; } int main() { ios::sync_with_stdio(0); cin.tie(0); int T = 1; cin >> T; while(T--) cout << solve() << "\n"; }
2.字符串
#include<bits/stdc++.h> using namespace std; #define ll long long ll n,m,k; string s; bool c(int x) { for(int i=x;i<n;i++) { if(s[i]!=s[n-i+x-1]) return 0; if(i>=n-i+x-1) break; } return 1; } int main() { ios::sync_with_stdio(0); cin.tie(0); cin >> s; n = s.size(); for(int i=0;i<n;i++) { if(s[i]==s[n-1]) { if(c(i)) { cout << i << "\n"; return 0; } } } }
3.机器人
#include<bits/stdc++.h> using namespace std; #define ll long long ll n,m,k; int main() { ios::sync_with_stdio(0); cin.tie(0); cin >> n; vector<pair<int,int>> a(n); for(int i=0;i<n;i++) { string st; cin >> k >> st; if(st=="L") m = 0; else m = 1; a[i] = {k,m}; } stack<pair<int,int>> sou,sji; vector<int> o(n); for(int i=0;i<n;i++) o[i] = i; sort(o.begin(),o.end(),[&](int x,int y) { return a[x]<a[y]; }); vector<int> ans(n,0); for(int i=0;i<n;i++) { int j = o[i]; if(a[j].second==0) { if(a[j].first%2==0) { if(sou.empty()) ans[j] = -1; else{ auto x = sou.top(); sou.pop(); ans[x.second] = ans[j] = (a[j].first-x.first)/2; } } else{ if(sji.empty()) ans[j] = -1; else{ auto x = sji.top(); sji.pop(); ans[x.second] = ans[j] = (a[j].first-x.first)/2; } } } else{ if(a[j].first%2==0) sou.push({a[j].first,j}); else sji.push({a[j].first,j}); } } while(!sou.empty()) { auto x = sou.top();sou.pop(); ans[x.second] = -1; } while(!sji.empty()) { auto x = sji.top();sji.pop(); ans[x.second] = -1; } for(auto& i:ans) cout << i << "\n"; }
4打车,只过了72%,求大佬指点
#include<bits/stdc++.h> using namespace std; #define ll long long ll n,m,k,x,y,p,q; vector<pair<ll,ll>> g1[55],g2[55]; vector<ll> dis1(55,1e18),dis2(55,1e18); void dijkstra1() { priority_queue<pair<ll,ll>> q; vector<int> vis(55,0); q.push({0,y}); dis1[y] = 0; while(!q.empty()) { auto now = q.top(); q.pop(); int u = now.second; if(vis[u]) continue; vis[u] = 1; for(int i=0;i<g1[u].size();i++) { ll v = g1[u][i].first,w = g1[u][i].second; if(dis1[v]>dis1[u]+w) { dis1[v] = dis1[u]+w; q.push({-dis1[v],v}); } } } } void dijkstra2() { priority_queue<pair<ll,ll>> q; vector<int> vis(55,0); q.push({0,x}); dis2[x] = 0; while(!q.empty()) { auto now = q.top(); q.pop(); int u = now.second; if(vis[u]) continue; vis[u] = 1; for(int i=0;i<g2[u].size();i++) { ll v = g2[u][i].first,w = g2[u][i].second; if(dis2[v]>dis2[u]+w) { dis2[v] = dis2[u]+w; q.push({-dis2[v],v}); } } } } int main() { ios::sync_with_stdio(0); cin.tie(0); cin >> n >> m >> x >> y; for(int i=0;i<m;i++) { int u,v; cin >> u >> v >> p >> q; g1[u].push_back({v,p}); g1[v].push_back({u,p}); g2[u].push_back({v,q}); g2[v].push_back({u,q}); } dijkstra1(); dijkstra2(); ll ans = 1e18; for(int i=1;i<=n;i++) { ll z; cin >> z; ans = min(ans,max(z,dis2[i])+dis1[i]); } //for(int i=1;i<=n;i++) cout << dis1[i] << " ";cout << "\n"; //for(int i=1;i<=n;i++) cout << dis2[i] << " ";cout << "\n"; cout << min(ans,dis2[y]) << "\n"; }
5.不踩坑
#include<bits/stdc++.h> using namespace std; vector<int> dp(10009,1e9); int main() { int n,p; cin >> n >> p; string s; cin >> s; vector<int> a(p+1,0); for(int i=1;i<=p;i++) cin >> a[i]; dp[1] = 0; for(int i=2;i<=n;i++) { if(s[i-1]=='x') continue; for(int j=1;j<=p&&i-j>=1;j++) { dp[i] = min(dp[i],dp[i-j]+a[j]); } } cout << dp[n] << "\n"; }
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