南京理工大学第八届校赛题目题解（部分）

https://icpc.njust.edu.cn/Contest/749/rank/、

a偷吃糖果

思路：读入的时候相同的字母合并成一个字母。最后比较一下。

/* ***********************************************
Author        :guanjun
Created Time  :2016/4/17 12:37:02
File Name     :njusta.cpp
************************************************ */
#include <iostream>
#include <cstring>
#include <cstdlib>
#include <stdio.h>
#include <algorithm>
#include <vector>
#include <queue>
#include <set>
#include <map>
#include <string>
#include <math.h>
#include <stdlib.h>
#include <iomanip>
#include <list>
#include <deque>
#include <stack>
#define ull unsigned long long
#define ll long long
#define mod 90001
#define INF 0x3f3f3f3f
#define maxn 10010
#define cle(a) memset(a,0,sizeof(a))
const ull inf = 1LL << 61;
const double eps=1e-5;
using namespace std;
priority_queue<int,vector<int>,greater<int> >pq;
struct Node{
    int x,y;
};
int main()
{
    #ifndef ONLINE_JUDGE
    freopen("in.txt","r",stdin);
    #endif
    //freopen("out.txt","w",stdout);
    int T;
    string s,t;
    cin>>T;
    while(T--){
        cin>>s>>t;
        string ss="";
        ss+=s[0];
        string tt="";
        tt+=t[0];
        int tmp=0;
        for(int i=1;i<s.size();i++){
            if(s[i]==ss[tmp])continue;
            tmp++;
            ss+=s[i];
        }
        tmp=0;
        for(int i=1;i<t.size();i++){
            if(t[i]==tt[tmp])continue;
            tmp++;
            tt+=t[i];
        }
        //cout<<ss<<" "<<tt<<endl;
        if(ss==tt)puts("Yes");
        else puts("No");
    }
    return 0;
}

c. count_prime

这是hduoj上的原题。容斥基础题。

#include <iostream>
#include <cstring>
#include <cstdlib>
#include <stdio.h>
#include <algorithm>
#include <vector>
#include <queue>
#include <set>
#include <map>
#include <string>
#include <math.h>
#include <stdlib.h>
#include <iomanip>
#include <list>
#include <deque>
#include <stack>
#define ull unsigned long long
#define ll long long
#define mod 90001
#define INF 0x3f3f3f3f
#define maxn 10000+10
#define cle(a) memset(a,0,sizeof(a))
const ull inf = 1LL << 61;
const double eps=1e-5;
using namespace std;

bool cmp(int a,int b){
    return a>b;
}
ll a,b,n;
ll solve(){
    ll sum=0;
    vector<ll>v;
    for(int i=2;i*i<=n;i++)
        if(n%i==0){
            v.push_back(i);
            while(n%i==0)n/=i;
        }
    if(n>1)v.push_back(n);
    for(ll st=1;st<(1<<(v.size()));++st){//0 1
        ll bits=0,mult=1;
        for(int i=0;i<(int)v.size();++i){
            if(st&(1<<i)){
                ++bits;
                mult*=v[i];
            }    
        }
        ll cur=b/mult-a/mult;
        if(a%mult==0)cur++;
        if(bits&1)sum+=cur;
        else sum-=cur;
    }
    return b-a-sum+1;
}
int main()
{
    #ifndef ONLINE_JUDGE
    freopen("in.txt","r",stdin); 
    #endif
    //freopen("out.txt","w",stdout);
    int t;
    cin>>t;
    for(int i=1;i<=t;i++){
        scanf("%I64d %I64d %I64d",&a,&b,&n);
        printf("%lld\n",solve());
    }
    return 0;
}

f.sequence

暴力一发

#include <iostream>
#include <cstring>
#include <cstdlib>
#include <stdio.h>
#include <algorithm>
#include <vector>
#include <queue>
#include <set>
#include <map>
#include <string>
#include <math.h>
#include <stdlib.h>
#include <iomanip>
#include <list>
#include <deque>
#include <stack>
#define ull unsigned long long
#define ll long long
#define mod 90001
#define INF 0x3f3f3f3f
#define maxn 10010
#define cle(a) memset(a,0,sizeof(a))
const ull inf = 1LL << 61;
const double eps=1e-5;
using namespace std;
priority_queue<int,vector<int>,greater<int> >pq;
struct Node{
    int x,y;
};

bool cmp(int a,int b){
    return a>b;
}
int dp[maxn],n,x,mark;
int main()
{
    #ifndef ONLINE_JUDGE
    freopen("in.txt","r",stdin);
    #endif
    //freopen("out.txt","w",stdout);
    int t;
    cin>>t;
    while(t--){
        cin>>n;
        int m=1;
        dp[1]=-INF;
        for(int i=1;i<=n;i++){
            scanf("%d",&x);
            mark=0;
            for(int j=1;j<=m;j++){
                if(dp[j]<=x){
                    dp[j]=x;
                    mark=1;
                    break;
                }
            }
            if(mark==0)dp[++m]=x;
        }
        printf("%d\n",m);
    }
    return 0;
}

h.谁才是最强战舰！

博弈 模板题

#include <iostream>
#include <cstring>
#include <cstdlib>
#include <stdio.h>
#include <algorithm>
#include <vector>
#include <queue>
#include <set>
#include <map>
#include <string>
#include <math.h>
#include <stdlib.h>
#include <iomanip>
#include <list>
#include <deque>
#include <stack>
#define ull unsigned long long
#define ll long long
#define mod 90001
#define INF 0x3f3f3f3f
#define maxn 10010
#define cle(a) memset(a,0,sizeof(a))
const ull inf = 1LL << 61;
const double eps=1e-5;
using namespace std;
priority_queue<int,vector<int>,greater<int> >pq;

int n;
bool Calculate() { 
    int i,x,xor_sum=0; 
    bool flag=1; 
    cin>>n; 
    for(i=1;i<=n;i++) { 
        scanf("%d",&x); 
        if(x^1) flag=0; xor_sum^=x;
    }
    if(flag)return !xor_sum;
    else return xor_sum; 
} 
int main(){
    #ifndef ONLINE_JUDGE
    freopen("in.txt","r",stdin);
    #endif
    //freopen("out.txt","w",stdout);
    int T,i; 
    for(cin>>T;T;T--) { 
        if(Calculate())puts("Yamato_Saikou!"); 
        else puts("Meidikeji_Shijiediyi!");
    } 
    return 0;
}

j.water1

#include <iostream>
#include <cstring>
#include <cstdlib>
#include <stdio.h>
#include <algorithm>
#include <vector>
#include <queue>
#include <set>
#include <map>
#include <string>
#include <math.h>
#include <stdlib.h>
#include <iomanip>
#include <list>
#include <deque>
#include <stack>
#define ull unsigned long long
#define ll long long
#define mod 90001
#define INF 0x3f3f3f3f
#define maxn 100100
#define cle(a) memset(a,0,sizeof(a))
const ull inf = 1LL << 61;
const double eps=1e-5;
using namespace std;
priority_queue<int,vector<int>,greater<int> >pq;

bool cmp(int a,int b){
    return a>b;
}
int a[maxn];
int b[maxn];
int main()
{
    #ifndef ONLINE_JUDGE
    freopen("in.txt","r",stdin);
    #endif
    //freopen("out.txt","w",stdout);
    int n;
    while(scanf("%d",&n)!=EOF){
        if(n==0){printf("%d\n",1);continue;}
        int Max=-1;
        for(int i=1;i<=n;i++){
            scanf("%d%d",&b[i],&a[i]);
            Max=max(b[i],Max);
        }
        ll ans=0;
        Max++;
        //cout<<Max<<endl;
        for(int i=1;i<=n;i++){
            ans+=a[i]*(Max-b[i]);
        }
        printf("%lld\n",ans);
    }
    return 0;
}

还有些 题目不会做。以后要补 官方题解https://icpc.njust.edu.cn/gist/comzyh/a36db955-1113-4fa2-9000-2beb0bdc7201/