文章目錄

• A - Health M Death
• B - Many Oranges
• C - Comma
• D - Shipping Center
• E - Lucky 7 Battle
• F - Coprime Present

Panasonic Programming Contest (AtCoder Beginner Contest 195)

A - Health M Death

判斷倍數。

#include <cstdio> int main() {int M, H;scanf( "%d %d", &M, &H );if( H % M == 0 ) printf( "Yes\n" );else printf( "No\n" );return 0; }

B - Many Oranges

橘子重量可以不是整數

• 最少個

  盡量每個橘子都是最大重量

  此外剩下一點重量，就再弄一個橘子，然后均分重量

• 最多個

  盡量每個橘子都是最小重量

  此外剩下一點重量，直接均分到每個橘子上

#include <cstdio> #include <cmath> using namespace std; int A, B, n;int main() {scanf( "%d %d %d", &A, &B, &n );n *= 1000;int min_tot = n / A, max_tot = n / B;int min_R = n - min_tot * A, max_R = n - max_tot * B;int t;t = int( ceil( ( A - min_R ) * 1.0 / min_tot ) );if( min_R && t + A > B ) return ! printf( "UNSATISFIABLE\n" );t = int( ceil( ( A - max_R ) * 1.0 / max_tot ) ) ;if( max_R && B - t < A ) return ! printf( "UNSATISFIABLE\n" );printf( "%d %d\n", max_tot + ( max_R ? 1 : 0 ), min_tot );return 0; }

C - Comma

直接$1e3,1e6,1e9,1e12,1e15$做分界線求

#include <cstdio> #define ll long longint main() {ll n;ll x1 = 1e3, x2 = 1e6, x3 = 1e9, x4 = 1e12, x5 = 1e15;scanf( "%lld", &n );if( n < x1 ) return ! printf( "0" );else if( n < x2) return ! printf( "%lld", n - x1 + 1 );else if( n < x3 ) return ! printf( "%lld", x2 - x1 + ( n - x2 + 1 ) * 2ll );else if( n < x4 ) return ! printf( "%lld", ( x3 - x2 ) * 2ll + x2 - x1 + ( n - x3 + 1 ) * 3ll );else if( n < x5 ) return ! printf( "%lld", ( x4 - x3 ) * 3ll + ( x3 - x2 ) * 2ll + x2 - x1 + ( n - x4 + 1 ) * 4ll );else return ! printf( "%lld", ( x5 - x4 ) * 4ll + ( x4 - x3 ) * 3ll + ( x3 - x2 ) * 2ll + x2 - x1 + ( n - x5 + 1 ) * 5ll );return 0; }

D - Shipping Center

每個包只能裝一袋垃圾

貪心，先裝價值最大的垃圾，用最小的能用空間

#include <cstdio> #include <iostream> #include <algorithm> using namespace std; #define maxn 55 struct node {int w, v; }bag[maxn], box[maxn]; int n, m, Q; int x[maxn]; bool vis[maxn];bool cmp1( node x, node y ) {return x.v > y.v; }bool cmp2( node x, node y ) {return x.v < y.v; }int main() {scanf( "%d %d %d", &n, &m, &Q );for( int i = 1;i <= n;i ++ )scanf( "%d %d", &bag[i].w, &bag[i].v );for( int i = 1;i <= m;i ++ )scanf( "%d", &box[i].v ), box[i].w = i;sort( bag + 1, bag + n + 1, cmp1 );sort( box + 1, box + m + 1, cmp2 );while( Q -- ) {int l, r;scanf( "%d %d", &l, &r );int ans = 0;for( int i = l;i <= r;i ++ ) vis[i] = 1;for( int i = 1;i <= n;i ++ )for( int j = 1;j <= m;j ++ )if( vis[box[j].w] || box[j].v < bag[i].w ) continue;else {vis[box[j].w] = 1;ans += bag[i].v;break;}for( int i = 1;i <= m;i ++ ) vis[i] = 0;printf( "%d\n", ans );}return 0; }

E - Lucky 7 Battle

倒著推，$dp[n]=\{0\}$，如果最終$0\in d{p}_0$就勝利

如果上一次操作是$T$，有一種情況可以達到，那么該余數就可以

$d{p}_i=\{r|r?10\%7\in d{p}_{i+1}?(r?10+s_{i+1})\%7\in d{p}_{i+1}\}$

如果上一次操作是$A$，必須所有情況都達到，該余數才可以

$d{p}_i=\{r|r?10\%7\in d{p}_{i+1}?(r?10+s_{i+1})\%7\in d{p}_{i+1}\}$

#include <cstdio> #include <iostream> using namespace std; #define maxn 200005 int n; char s[maxn], x[maxn]; int dp[maxn][7];int main() {scanf( "%d %s %s", &n, s + 1, x + 1 );dp[n][0] = 1;for( int i = n - 1;~ i;i -- )for( int r = 0;r < 7;r ++ )if( x[i + 1] == 'T' )dp[i][r] = dp[i + 1][r * 10 % 7] | dp[i + 1][( r * 10 + ( s[i + 1] ^ 48 ) ) % 7];elsedp[i][r] = dp[i + 1][r * 10 % 7] & dp[i + 1][( r * 10 + ( s[i + 1] ^ 48 ) ) % 7];if( dp[0][0] ) printf( "Takahashi\n" );else printf( "Aoki\n" );return 0; }

F - Coprime Present

差值只有$72$，所以${?}_{x>72},x$的倍數最多只能出現一次，本質是構成其的質數最多只能出現一次

$72$內的質數恰好$20$個，兩兩互質，就相當于各個質數只出現一次

用狀壓$DP$完事

#include <cstdio> #define int long long #define maxn 1050000 int prime[20] = { 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71 }; int dp[maxn]; int A, B;signed main() {scanf( "%lld %lld", &A, &B );dp[0] = 1;for( int i = A;i <= B;i ++ ) {int t = 0;for( int j = 0;j < 20;j ++ )if( i % prime[j] == 0 )t |= ( 1 << j );for( int s = 0;s < ( 1 << 20 );s ++ )if( ! ( s & t ) ) dp[s | t] += dp[s];}int ans = 0;for( int i = 0;i < ( 1 << 20 );i ++ )ans += dp[i];printf( "%lld\n", ans );return 0; } 創作挑戰賽新人創作獎勵來咯，堅持創作打卡瓜分現金大獎

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