cf #541

A. Sea Battle
B. Draw!

题意:给你间断的比赛比分,问你有多少次比分相同?

分析:比赛时怎们也想不出正确的解法?。原来要找相临比分间的交集,我也不清楚怎么写简单的求交集。就把6种情况都考虑了。

程序实现前四种就可以。注意如果 a[i] == b [ i ] ,也就是两个比分相等,那它会被前后两次计算在内,所以判断一下减去一次就可以了。对了如果结果是0,加一下1。因为结果一定不小于0。
在这里插入图片描述

#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
const int MA=10005;
ll a[MA],b[MA];
int main()
{
    ll n;
    cin>>n;
    for(int i=1;i<=n;++i){
        cin>>a[i]>>b[i];
    }
    ll ans=0;
    for(int i=1;i<=n;++i){
        if(a[i-1]>=b[i-1]&&a[i-1]<=b[i]&&a[i]>=b[i])
          ans+=b[i]-a[i-1]+1;
        else if((a[i]>=b[i-1]&&a[i]<=b[i]&&a[i-1]<=b[i-1]))
          ans+=a[i]-b[i-1]+1;
        else if(a[i-1]<=b[i-1]&&a[i]>=b[i])
          ans+=b[i]-b[i-1]+1;
        else if(b[i-1]<=a[i-1]&&b[i]>=a[i])
          ans+=a[i]-a[i-1]+1;
        if(a[i]==b[i]&&i<n)ans--;//注意
    }
    if(ans==0)ans++;
    cout<<ans<<endl;
    return 0;
}

C. Brithday

题意 : 给你n个数,让你排序使相邻两数之差最小。

​ 刚开始就没理解题意,以为需要每次判断如果这一项与左边得值差小,就将这个值放在左边,相反放在右边。但不是这样的,看题不仔细既浪费时间又wa。

这道题用贪心去做,既然要学生之间的“ 不适 ”最小,那将升高排序,先从 1 向后将奇数位的值输出,在讨论 n 的奇偶。

n 为奇数,那么它在之前就输出了,所以现在从 n - 1 位输出到第 2 位。
n 为偶数,那它没输出过,所以从 n 位输出到 2 位。

#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
const int MA=105;
ll a[MA];
int main()
{
    int n;
    cin>>n;
    for(int i=1;i<=n;++i)
        cin>>a[i];
    sort(a+1,a+n+1);
    for(int i=1;i<=n;i+=2)
        cout<<a[i]<<" ";
    if(n%2){
        for(int i=n-1;i>2;i-=2)
            cout<<a[i]<<" ";
        cout<<a[2];
    }
    else{
        for(int i=n;i>2;i-=2)
            cout<<a[i]<<" ";
        cout<<a[2];
    }
    cout<<endl;
    return 0;
}
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你能否将上面的HEX颜色值按以下色系划分,不要有预留 红色系 橙色系 黄色系 绿色系 蓝色系 紫色系 粉色系 棕色系 灰色系(含白色系)
06-08
# [ 33.344784] rtl8723bs: acquire FW from file:rtlwifi/rtl8723bs_nic.bin cat > /tmp/wpa.conf <<EOF > network={ > ssid="Xiaomi_6E67" > psk="15022688" > key_mgmt=WPA-PSK > proto=RSN # 强制使用WPA2 > pairwise=CCMP # 强制AES加密 > group=CCMP > scan_ssid=1 # 扫描隐藏网络 > freq_list=2427 # 指定2.4GHz频段 > } > EOF # wpa_supplicant -d -Dnl80211 -iwlan0 -c/tmp/wpa.conf wpa_supplicant v2.10 random: Trying to read entropy from /dev/random Successfully initialized wpa_supplicant Initializing interface &#39;wlan0&#39; conf &#39;/tmp/wpa.conf&#39; driver &#39;nl80211&#39; ctrl_interface &#39;N/A&#39; bridge &#39;N/A&#39; Configuration file &#39;/tmp/wpa.conf&#39; -> &#39;/tmp/wpa.conf&#39; Reading configuration file &#39;/tmp/wpa.conf&#39; Priority group 0 id=0 ssid=&#39;Xiaomi_6E67&#39; nl80211: Supported cipher 00-0f-ac:1 nl80211: Supported cipher 00-0f-ac:5 nl80211: Supported cipher 00-0f-ac:2 nl80211: Supported cipher 00-0f-ac:4 nl80211: Supported cipher 00-0f-ac:6 nl80211: Using driver-based off-channel TX nl80211: key_mgmt=0xd0f enc=0x10f auth=0x7 flags=0x800d0c0 rrm_flags=0x0 probe_resp_offloads=0x0 max_stations=0 max_remain_on_chan=5000 max_scan_ssids=9 nl80211: interface wlan0 in phy phy0 nl80211: Set mode ifindex 2 iftype 2 (STATION) nl80211: Subscribe to mgmt frames with non-AP handle 0x53cf78 nl80211: Register frame type=0xd0 (WLAN_FC_STYPE_ACTION) nl_handle=0x53cf78 match=0801 multicast=0 nl80211: Register frame type=0xd0 (WLAN_FC_STYPE_ACTION) nl_handle=0x53cf78 match=06 multicast=0 nl80211: Register frame type=0xd0 (WLAN_FC_STYPE_ACTION) nl_handle=0x53cf78 match=0a07 multicast=0 nl80211: Register frame type=0xd0 (WLAN_FC_STYPE_ACTION) nl_handle=0x53cf78 match=0a11 multicast=0 nl80211: Register frame type=0xd0 (WLAN_FC_STYPE_ACTION) nl_handle=0x53cf78 match=1101 multicast=0 nl80211: Register frame type=0xd0 (WLAN_FC_STYPE_ACTION) nl_handle=0x53cf78 match=1102 multicast=0 nl80211: Register frame type=0xd0 (WLAN_FC_STYPE_ACTION) nl_handle=0x53cf78 match=0505 multicast=0 nl80211: Register frame type=0xd0 (WLAN_FC_STYPE_ACTION) nl_handle=0x53cf78 match=0500 multicast=0 nl80211: Register frame type=0xd0 (WLAN_FC_STYPE_ACTION) nl_handle=0x53cf78 match=1301 multicast=0 nl80211: Register frame type=0xd0 (WLAN_FC_STYPE_ACTION) nl_handle=0x53cf78 match=1305 multicast=0 nl80211: Register frame type=0xd0 (WLAN_FC_STYPE_ACTION) nl_handle=0x53cf78 match=7e506f9a1a multicast=0 rfkill: initial event: idx=0 type=1 op=0 soft=0 hard=0 netlink: Operstate: ifindex=2 linkmode=1 (userspace-control), operstate=5 (IF_OPER_DORMANT) Add interface wlan0 to a new radio phy0 nl80211: Regulatory information - country=00 nl80211: 2402-2472 @ 40 MHz 20 mBm nl80211: 2457-2482 @ 20 MHz 20 mBm (no IR) nl80211: 2474-2494 @ 20 MHz 20 mBm (no OFDM) (no IR) nl80211: 5170-5250 @ 80 MHz 20 mBm (no IR) nl80211: 5250-5330 @ 80 MHz 20 mBm (DFS) (no IR) nl80211: 5490-5730 @ 160 MHz 20 mBm (DFS) (no IR) nl80211: 5735-5835 @ 80 MHz 20 mBm (no IR) nl80211: 57240-63720 @ 2160 MHz 0 mBm nl80211: Added 802.11b mode based on 802.11g information nl80211: Mode IEEE 802.11g: 2412 2417 2422 2427 2432 2437 2442 2447 2452 2457 2462 2467 2472 2484[DISABLED] nl80211: Mode IEEE 802.11b: 2412 2417 2422 2427 2432 2437 2442 2447 2452 2457 2462 2467 2472 2484[DISABLED] wlan0: Own MAC address: cc:b8:5e:f5:a6:86 wpa_driver_nl80211_set_key: ifindex=2 (wlan0) alg=0 addr=(nil) key_idx=0 set_tx=0 seq_len=0 key_len=0 key_flag=0x10 nl80211: DEL_KEY broadcast key wpa_driver_nl80211_set_key: ifindex=2 (wlan0) alg=0 addr=(nil) key_idx=1 set_tx=0 seq_len=0 key_len=0 key_flag=0x10 nl80211: DEL_KEY broadcast key wpa_driver_nl80211_set_key: ifindex=2 (wlan0) alg=0 addr=(nil) key_idx=2 set_tx=0 seq_len=0 key_len=0 key_flag=0x10 nl80211: DEL_KEY broadcast key wpa_driver_nl80211_set_key: ifindex=2 (wlan0) alg=0 addr=(nil) key_idx=3 set_tx=0 seq_len=0 key_len=0 key_flag=0x10 nl80211: DEL_KEY broadcast key wpa_driver_nl80211_set_key: ifindex=2 (wlan0) alg=0 addr=(nil) key_idx=4 set_tx=0 seq_len=0 key_len=0 key_flag=0x10 nl80211: DEL_KEY broadcast key wpa_driver_nl80211_set_key: ifindex=2 (wlan0) alg=0 addr=(nil) key_idx=5 set_tx=0 seq_len=0 key_len=0 key_flag=0x10 nl80211: DEL_KEY broadcast key wlan0: RSN: flushing PMKID list in the driver nl80211: Flush PMKIDs wlan0: Setting scan request: 0.100000 sec TDLS: TDLS operation not supported by driver TDLS: Driver uses internal link setup TDLS: Driver does not support TDLS channel switching wlan0: Added interface wlan0 wlan0: State: DISCONNECTED -> DISCONNECTED nl80211: Set wlan0 operstate 0->0 (DORMANT) netlink: Operstate: ifindex=2 linkmode=-1 (no change), operstate=5 (IF_OPER_DORMANT) nl80211: Skip set_supp_port(unauthorized) while not associated random: Got 20/20 bytes from /dev/random RTM_NEWLINK: ifi_index=2 ifname=wlan0 operstate=2 linkmode=1 ifi_family=0 ifi_flags=0x1003 ([UP]) wlan0: State: DISCONNECTED -> SCANNING Scan SSID - hexdump_ascii(len=11): 58 69 61 6f 6d 69 5f 36 45 36 37 Xiaomi_6E67 wlan0: Starting AP scan for wildcard SSID wlan0: Add radio work &#39;scan&#39;@0x53f718 wlan0: First radio work item in the queue - schedule start immediately wlan0: Starting radio work &#39;scan&#39;@0x53f718 after 0.000095 second wait wlan0: nl80211: scan request Scan requested (ret=0) - scan timeout 10 seconds nl80211: Drv Event 33 (NL80211_CMD_TRIGGER_SCAN) received for wlan0 wlan0: nl80211: Scan trigger wlan0: Event SCAN_STARTED (47) received wlan0: Own scan request started a scan in 0.000210 seconds RTM_NEWLINK: ifi_index=2 ifname=wlan0 wext ifi_family=0 ifi_flags=0x1003 ([UP]) nl80211: Drv Event 34 (NL80211_CMD_NEW_SCAN_RESULTS) received for wlan0 wlan0: nl80211: New scan results available nl80211: Scan probed for SSID &#39;Xiaomi_6E67&#39; nl80211: Scan probed for SSID &#39;&#39; nl80211: Scan included frequencies: 2412 2417 2422 2427 2432 2437 2442 2447 2452 2457 2462 2467 2472 wlan0: Event SCAN_RESULTS (3) received wlan0: Scan completed in 1.536741 seconds nl80211: Received scan results (1 BSSes) wlan0: BSS: Start scan result update 1 wlan0: BSS: Add new id 0 BSSID cc:d8:43:81:b9:9e SSID &#39;Xiaomi_6E67&#39; freq 2432 BSS: last_scan_res_used=1/32 wlan0: New scan results available (own=1 ext=0) wlan0: Radio work &#39;scan&#39;@0x53f718 done in 1.541366 seconds wlan0: radio_work_free(&#39;scan&#39;@0x53f718): num_active_works --> 0 wlan0: Selecting BSS from priority group 0 wlan0: 0: cc:d8:43:81:b9:9e ssid=&#39;Xiaomi_6E67&#39; wpa_ie_len=0 rsn_ie_len=20 caps=0x1431 level=-66 freq=2432 wps wlan0: selected based on RSN IE wlan0: skip - frequency not allowed wlan0: No suitable network found wlan0: Setting scan request: 5.000000 sec Scan SSID - hexdump_ascii(len=11): 58 69 61 6f 6d 69 5f 36 45 36 37 Xiaomi_6E67 wlan0: Starting AP scan for wildcard SSID wlan0: Add radio work &#39;scan&#39;@0x5404d8 wlan0: First radio work item in the queue - schedule start immediately wlan0: Starting radio work &#39;scan&#39;@0x5404d8 after 0.000087 second wait wlan0: nl80211: scan request Scan requested (ret=0) - scan timeout 30 seconds nl80211: Drv Event 33 (NL80211_CMD_TRIGGER_SCAN) received for wlan0 wlan0: nl80211: Scan trigger wlan0: Event SCAN_STARTED (47) received wlan0: Own scan request started a scan in 0.000248 seconds RTM_NEWLINK: ifi_index=2 ifname=wlan0 wext ifi_family=0 ifi_flags=0x1003 ([UP]) nl80211: Drv Event 34 (NL80211_CMD_NEW_SCAN_RESULTS) received for wlan0 wlan0: nl80211: New scan results available nl80211: Scan probed for SSID &#39;Xiaomi_6E67&#39; nl80211: Scan probed for SSID &#39;&#39; nl80211: Scan included frequencies: 2412 2417 2422 2427 2432 2437 2442 2447 2452 2457 2462 2467 2472 wlan0: Event SCAN_RESULTS (3) received wlan0: Scan completed in 1.761073 seconds nl80211: Received scan results (1 BSSes) wlan0: BSS: Start scan result update 2 BSS: last_scan_res_used=1/32 wlan0: New scan results available (own=1 ext=0) wlan0: Radio work &#39;scan&#39;@0x5404d8 done in 2.204339 seconds wlan0: radio_work_free(&#39;scan&#39;@0x5404d8): num_active_works --> 0 wlan0: Selecting BSS from priority group 0 wlan0: 0: cc:d8:43:81:b9:9e ssid=&#39;Xiaomi_6E67&#39; wpa_ie_len=0 rsn_ie_len=20 caps=0x1431 level=-66 freq=2432 wps wlan0: selected based on RSN IE wlan0: skip - frequency not allowed wlan0: No suitable network found wlan0: Setting scan request: 5.000000 sec journalctl -f | grep -E &#39;wpa_supplicant|rtl8723bs&#39; Scan SSID - hexdump_ascii(len=11): 58 69 61 6f 6d 69 5f 36 45 36 37 Xiaomi_6E67 wlan0: Starting AP scan for wildcard SSID wlan0: Add radio work &#39;scan&#39;@0x541ff0 wlan0: First radio work item in the queue - schedule start immediately wlan0: Starting radio work &#39;scan&#39;@0x541ff0 after 0.000076 second wait wlan0: nl80211: scan request Scan requested (ret=0) - scan timeout 30 seconds
最新发布
06-09
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