“东信杯”广西大学第一届程序设计竞赛（同步赛）（未完待更）

A  

https://ac.nowcoder.com/acm/contest/283/A 

#include<stdio.h>
int main()
{
    for(int i=0;i<90;i++)
        printf("Ninety for GXU, First for gxuacm
");
    return 0;
}

C 

https://ac.nowcoder.com/acm/contest/283/C 

#include <bits/stdc++.h>
using namespace std;
 
int T;
char s[220];
 
int check(char a, char b) {
    if(a == b) return 1;
    else if(abs(a - b) == 2) return 1;
    return 0;
}
 
int main() {
    scanf("%d", &T);
    while(T --) {
        int n;
        scanf("%d%s", &n, s);
 
        bool flag = true;
        if(n % 2 != 0) {
            flag = false;
            break;
        }
 
        int L = 0, R = n - 1;
        while(L <= R) {
            if(!check(s[L], s[R])) {
                flag = false;
                break;
            }
            L ++;
            R --;
        }
        if(flag) printf("1
");
        else printf("0
");
    }
    return 0;
}

D

https://ac.nowcoder.com/acm/contest/view-submission?submissionId=37539035

#include <bits/stdc++.h>
using namespace std;
 
const int maxn = 1e5 + 10;
int T;
long long N, M;
long long x[maxn];
 
int main() {
    scanf("%d", &T);
    while(T --) {
        int cnt = 0;
        scanf("%lld%lld", &N, &M);
 
        long long maxx = max(N, M), minn = min(N, M);
        while(minn) {
            x[cnt ++] = maxx / minn;
            maxx %= minn;
 
            if(maxx < minn)
                swap(maxx, minn);
        }
 
        bool flag = true;
        int pos = cnt - 2;
        while(1) {
            if(pos < 0) {
                flag = true;
                break;
            }
            if(pos == 0) {
                if(x[pos] == 1) {
                    flag = false;
                    break;
                }
            }
 
            if(x[pos] == 1) pos -= 2;
            else pos --;
        }
 
        if(flag) printf("wula
");
        else printf("mmp
");
    }
    return 0;
}

F

https://ac.nowcoder.com/acm/contest/283/F

#include <bits/stdc++.h>
using namespace std;

const int maxn = (1 << 15) + 10;
int n, T;
long long mp[20][20];
long long dp[maxn];

int main() {
    scanf("%d", &T);
    while(T --) {
        scanf("%d", &n);
        for(int i = 0; i < n; i ++) {
            for(int j = 0; j < n; j ++)
                scanf("%lld", &mp[i][j]);
        }


        for(int i = 0; i < (1 << n); i ++) {
            int cnt = 0;
            for(int j = 0; j < n; j ++)
                if(i & (1 << j)) cnt ++;

            long long maxx = 0;
            for(int j = 0; j < n; j ++) {
                if(i & (1 << j)) {
                    maxx = max(maxx, dp[i ^ (1 << j)] + mp[j][cnt - 1]);
                }
            }
            dp[i] = maxx;
        }

        printf("%lld
", dp[(1 << n) - 1]);
    }
    return 0;
}

H

https://ac.nowcoder.com/acm/contest/283/H

#include <cstdio>
#include <string>
#include <map>
#include <queue>
#include <stack>
#include <cstring>
#include <iostream>
#include <algorithm>
using namespace std;
 
const long long mod = 1e9 + 7;
long long INF = 1e18;
const int Node = 50000 + 10;
const int Edge = 100000 + 10;
 
int n, m, s, t;
long long dis[Node];
int h[Node], a[Edge], b[Edge], nx[Edge], edgeCount;
long long c[Edge];
 
void add(int aa, int bb, long long cc) {
    a[edgeCount] = aa;
    b[edgeCount] = bb;
    c[edgeCount] = cc;
 
    nx[edgeCount] = h[aa];
    h[aa] = edgeCount;
    edgeCount++;
}
 
void init() {
    edgeCount = 0;
 
    for (int i = 1; i <= n; i++) {
        dis[i] = INF;
        h[i] = -1;
    }
    dis[s] = 0;
}
 
void input() {
    for (int i = 1; i <= m; i++) {
        int aa, bb;
        long long cc;
        scanf("%d%d%lld", &aa, &bb, &cc);
        for (long long i = 0; ; i++) {
            if (1LL * (1 << i) == cc) {
                cc = i;
                break;
            }
        }
        add(aa, bb, cc);
    //  cout << aa << " !!! " << bb << " " << cc << endl;
    }
}
 
void dijkstra() {
    priority_queue<pair<long long, int>> q;
    q.push(make_pair(0, s));
    while (!q.empty()) {
        pair<long long, int> tp = q.top();
        q.pop();
 
        int d = -tp.first;
        int v = tp.second;
 
        for (int i = h[v]; i != -1; i = nx[i]) {
            if (dis[v] + c[i] < dis[b[i]]) {
                dis[b[i]] = dis[v] + c[i];
                q.push(make_pair(-dis[b[i]], b[i]));
            }
        }
    }
}
 
long long qp(long long x, long long y) {
    long long res = 1;
    x = x % mod;
    while (y) {
        if (y % 2 == 1) {
            res = res * x % mod;
            y--;
        }
        x = x * x % mod;
        y /= 2;
    }
    return res;
}
 
int main() {
 
        scanf("%d%d%d%d", &n, &m, &s, &t);
        init();
        input();
        dijkstra();
        if (dis[t] == INF) {
            printf("-1
");
        }
        else {
            cout << qp(2LL, dis[t]) << endl;
        }
     
    return 0;
}

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