输出a , b , c , d的最小值即可。
#include "iostream" #include "cstring" #include "string" #include "vector" #include "cmath" #include "algorithm" #include "map" #include "set" #include "queue" #include "stack" #define fi first #define se second #define PB push_back #define mst(x,a) memset(x,a,sizeof(x)) #define all(a) begin(a),end(a) #define rep(x,l,u) for(ll x=l;x<u;x++) #define rrep(x,l,u) for(ll x=l;x>=u;x--) #define sz(x) x.size() #define IOS ios::sync_with_stdio(false);cin.tie(0); #define seteps(N) setprecision(N) #define lson (ind<<1) #define rson (ind<<1|1) using namespace std; typedef long long ll; typedef unsigned long long ull; typedef __int128 lll; typedef pair<int,int> PII; typedef pair<char,char> PCC; typedef pair<double,double> PDD; typedef pair<ll,ll> PLL; const int N=1010; const int M=1<<19; const int INF=0x3f3f3f3f; const int mod=1e9+7; const lll oone=1; const double eps=1e-6; const double pi=acos(-1); void solve(){ int a,b,c,d; cin>>a>>b>>c>>d; int res=min(a,b); res=min(res,c); res=min(res,d); cout<<res<<endl; } int main(){ IOS; //freopen("try.in", "r", stdin); //freopen("try2.out", "w", stdout); //int t;cin>>t; //while(t--) solve(); return 0; }
根据题意模拟过程。需要注意的一点是,在咖啡店充电时,电量不能超过充电宝的上限。
#include "iostream" #include "cstring" #include "string" #include "vector" #include "cmath" #include "algorithm" #include "map" #include "set" #include "queue" #include "stack" #define fi first #define se second #define PB push_back #define mst(x,a) memset(x,a,sizeof(x)) #define all(a) begin(a),end(a) #define rep(x,l,u) for(ll x=l;x<u;x++) #define rrep(x,l,u) for(ll x=l;x>=u;x--) #define sz(x) x.size() #define IOS ios::sync_with_stdio(false);cin.tie(0); #define seteps(N) setprecision(N) #define lson (ind<<1) #define rson (ind<<1|1) using namespace std; typedef long long ll; typedef unsigned long long ull; typedef __int128 lll; typedef pair<int,int> PII; typedef pair<char,char> PCC; typedef pair<double,double> PDD; typedef pair<ll,ll> PLL; const int N=1010; const int M=1<<19; const int INF=0x3f3f3f3f; const int mod=1e9+7; const lll oone=1; const double eps=1e-6; const double pi=acos(-1); void solve(){ ll n,m,t; cin>>n>>m>>t; ll cur=n,last=0; bool ok=true; rep(i,0,m){ ll a,b; cin>>a>>b; cur-=(a-last); if(cur<=0) ok=false; cur+=(b-a); if(cur>n) cur=n; last=b; } if(cur) cur-=(t-last); if(cur<=0) ok=false; cout<<(ok ? "Yes" :"No")<<endl; } int main(){ IOS; //freopen("try.in", "r", stdin); //freopen("try2.out", "w", stdout); //int t;cin>>t; //while(t--) solve(); return 0; }
直接算C ( l − 1 , l − 12 )即可。由于题目中没有模数,偷懒使用了JAVA的大整数
import java.math.BigInteger; import java.util.Scanner; public class Main { public static void main(String[] args) { Scanner cin = new Scanner(System.in); int l = cin.nextInt(); int u=l-1,d=l-12; BigInteger big = new BigInteger("1"); for(int i=u;i>=u-d+1;i--){ big = big.multiply(new BigInteger(String.valueOf(i))); } for (int i = 1; i <= d; i++) big = big.divide(new BigInteger(String.valueOf(i))); System.out.println(big.toString()); } }
找到两个蓝色邮票之间最少的白色邮票个数,然后从前到后模拟,算下个数即可。
#include "iostream" #include "cstring" #include "string" #include "vector" #include "cmath" #include "algorithm" #include "map" #include "set" #include "queue" #include "stack" #define fi first #define se second #define PB push_back #define mst(x,a) memset(x,a,sizeof(x)) #define all(a) begin(a),end(a) #define rep(x,l,u) for(ll x=l;x<u;x++) #define rrep(x,l,u) for(ll x=l;x>=u;x--) #define sz(x) x.size() #define IOS ios::sync_with_stdio(false);cin.tie(0); #define seteps(N) setprecision(N) #define lson (ind<<1) #define rson (ind<<1|1) using namespace std; typedef long long ll; typedef unsigned long long ull; typedef __int128 lll; typedef pair<int,int> PII; typedef pair<char,char> PCC; typedef pair<double,double> PDD; typedef pair<ll,ll> PLL; const int N=3*1e5+10; const int M=1<<19; const int INF=0x3f3f3f3f; const int mod=1e9+7; const lll oone=1; const double eps=1e-6; const double pi=acos(-1); int a[N]; void solve(){ int n,m; cin>>n>>m; rep(i,1,m+1) cin>>a[i]; if(!m){ cout<<1<<endl; return; } if(n==m){ cout<<0<<endl; return; } sort(a+1,a+m+1); int mn=INF; if(a[1]!=1) mn=min(mn,a[1]-1); if(a[m]!=n) mn=min(mn,n-a[m]); rep(i,2,m+1){ if(a[i]-a[i-1]-1==0) continue; mn=min(mn,a[i]-a[i-1]-1); } int ans=0; rep(i,2,m+1){ int gap=a[i]-a[i-1]-1; ans+=gap/mn+(gap%mn!=0); } ans+=(n-a[m])/mn+((n-a[m])%mn!=0); ans+=(a[1]-1)/mn+((a[1]-1)%mn!=0); cout<<ans<<endl; } int main(){ IOS; //freopen("try.in", "r", stdin); //freopen("try2.out", "w", stdout); //int t;cin>>t; //while(t--) solve(); return 0; }
#include "iostream" #include "cstring" #include "string" #include "vector" #include "cmath" #include "algorithm" #include "map" #include "set" #include "queue" #include "stack" #define fi first #define se second #define PB push_back #define mst(x,a) memset(x,a,sizeof(x)) #define all(a) begin(a),end(a) #define rep(x,l,u) for(ll x=l;x<u;x++) #define rrep(x,l,u) for(ll x=l;x>=u;x--) #define sz(x) x.size() #define IOS ios::sync_with_stdio(false);cin.tie(0); #define seteps(N) setprecision(N) #define uni(x) sort(all(x)), x.erase(unique(all(x)), x.end()) #define lson (ind<<1) #define rson (ind<<1|1) using namespace std; typedef long long ll; typedef unsigned long long ull; typedef __int128 lll; typedef pair<int,int> PII; typedef pair<char,char> PCC; typedef pair<double,double> PDD; typedef pair<ll,ll> PLL; const int N=1010; const int M=1<<19; const int INF=0x3f3f3f3f; const int mod=1e9+7; const lll oone=1; const double eps=1e-6; const double pi=acos(-1); int f[N][N]; void solve(){ int n,m; cin>>n>>m; vector<int> a(n+1,0),b(m+1,0); rep(i,1,n+1) cin>>a[i]; rep(i,1,m+1) cin>>b[i]; mst(f,INF); f[0][0]=0; rep(i,1,n+1) f[i][0]=i; rep(i,1,m+1) f[0][i]=i; rep(i,1,n+1){ rep(j,1,m+1){ if(a[i]==b[j]) f[i][j]=min(f[i][j],f[i-1][j-1]); f[i][j]=min(f[i][j],f[i-1][j]+1); f[i][j]=min(f[i][j],f[i][j-1]+1); f[i][j]=min(f[i][j],f[i-1][j-1]+1); } } cout<<f[n][m]<<endl; } int main(){ IOS; //freopen("try.in", "r", stdin); //freopen("try2.out", "w", stdout); //int t;cin>>t; //while(t--) solve(); return 0; }
模板题,线段树或者树状数组都可以做
#include "iostream" #include "cstring" #include "string" #include "vector" #include "cmath" #include "algorithm" #include "map" #include "set" #include "queue" #include "stack" #define fi first #define se second #define PB push_back #define mst(x,a) memset(x,a,sizeof(x)) #define all(a) begin(a),end(a) #define rep(x,l,u) for(ll x=l;x<u;x++) #define rrep(x,l,u) for(ll x=l;x>=u;x--) #define sz(x) x.size() #define IOS ios::sync_with_stdio(false);cin.tie(0); #define seteps(N) setprecision(N) #define lson (ind<<1) #define rson (ind<<1|1) using namespace std; typedef long long ll; typedef unsigned long long ull; typedef __int128 lll; typedef pair<int,int> PII; typedef pair<char,char> PCC; typedef pair<double,double> PDD; typedef pair<ll,ll> PLL; const int N=3*1e5+10; const int M=1<<19; const int INF=0x3f3f3f3f; const int mod=1e9+7; const lll oone=1; const double eps=1e-6; const double pi=acos(-1); int a[N]; struct Node{ int l,r,cur; }node[N * 4]; struct SegTree{ void push_up(int ind){ node[ind].cur=node[lson].cur^node[rson].cur; } void push_down(int ind){ } void build(int l,int r,int ind){ node[ind].l=l; node[ind].r=r; if(l==r){ node[ind].cur=a[l]; }else{ int mid=l+r>>1; build(l,mid,lson); build(mid+1,r,rson); push_up(ind); } } void update(int l,int r,int ind,int val){ if(l>node[ind].r || r<node[ind].l) return; if(l<=node[ind].l && r>=node[ind].r){ node[ind].cur^=val; }else{ push_down(ind); update(l,r,lson,val); update(l,r,rson,val); push_up(ind); } } void query(int l,int r,int ind,ll &ans){ if(l>node[ind].r || r<node[ind].l) return; if(l<=node[ind].l && node[ind].r<=r){ ans^=node[ind].cur; }else{ push_down(ind); query(l,r,lson,ans); query(l,r,rson,ans); push_up(ind); } } }; void solve(){ int n,q; cin>>n>>q; rep(i,1,n+1) cin>>a[i]; SegTree seg; seg.build(1,n,1); while(q--){ int op,x,y; cin>>op>>x>>y; if(op==1){ seg.update(x,x,1,y); }else{ ll ans=0; seg.query(x,y,1,ans); cout<<ans<<endl; } } } int main(){ IOS; //freopen("try.in", "r", stdin); //freopen("try2.out", "w", stdout); //int t;cin>>t; //while(t--) solve(); return 0; }
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