佳木斯集训Day4
Day4的出题人好毒瘤啊！！！
T1我打表过的，正解现在也不会
1 #include <bits/stdc++.h> 2 #define MAXN 10050 3 #define ll long long 4 using namespace std; 5 ll n,ans[2505]={0,0,0,0,0,1,1,1,1,2,2,5,7,10,10,10,10,11,11,14,16,19,19,26,32,39,43,52,58,65,65,65,65,66,66,69,71,74,74,81,87,94,98,107,113,120,120,135,149,164,176,193,207,222,230,251,269,288,300,321,335,350,350,350,350,351,351,354,356,359,359,366,372,379,383,392,398,405,405,420,434,449,461,478,492,507,515,536,554,573,585,606,620,635,635,666,696,727,755,788,818,849,873,910,944,979,1007,1044,1074,1105,1121,1166,1208,1251,1287,1332,1370,1409,1433,1482,1524,1567,1595,1640,1670,1701,1701,1701,1701,1702,1702,1705,1707,1710,1710,1717,1723,1730,1734,1743,1749,1756,1756,1771,1785,1800,1812,1829,1843,1858,1866,1887,1905,1924,1936,1957,1971,1986,1986,2017,2047,2078,2106,2139,2169,2200,2224,2261,2295,2330,2358,2395,2425,2456,2472,2517,2559,2602,2638,2683,2721,2760,2784,2833,2875,2918,2946,2991,3021,3052,3052,3115,3177,3240,3300,3365,3427,3490,3546,3615,3681,3748,3808,3877,3939,4002,4050,4127,4201,4276,4344,4421,4491,4562,4618,4699,4773,4848,4908,4985,5047,5110,5142,5235,5325,5416,5500,5593,5679,5766,5838,5935,6025,6116,6192,6285,6363,6442,6490,6595,6693,6792,6876,6977,7063,7150,7206,7311,7401,7492,7552,7645,7707,7770,7770,7770,7770,7771,7771,7774,7776,7779,7779,7786,7792,7799,7803,7812,7818,7825,7825,7840,7854,7869,7881,7898,7912,7927,7935,7956,7974,7993,8005,8026,8040,8055,8055,8086,8116,8147,8175,8208,8238,8269,8293,8330,8364,8399,8427,8464,8494,8525,8541,8586,8628,8671,8707,8752,8790,8829,8853,8902,8944,8987,9015,9060,9090,9121,9121,9184,9246,9309,9369,9434,9496,9559,9615,9684,9750,9817,9877,9946,10008,10071,10119,10196,10270,10345,10413,10490,10560,10631,10687,10768,10842,10917,10977,11054,11116,11179,11211,11304,11394,11485,11569,11662,11748,11835,11907,12004,12094,12185,12261,12354,12432,12511,12559,12664,12762,12861,12945,13046,13132,13219,13275,13380,13470,13561,13621,13714,13776,13839,13839,13966,14092,14219,14343,14472,14598,14725,14845,14978,15108,15239,15363,15496,15622,15749,15861,16002,16140,16279,16411,16552,16686,16821,16941,17086,17224,17363,17487,17628,17754,17881,17977,18134,18288,18443,18591,18748,18898,19049,19185,19346,19500,19655,19795,19952,20094,20237,20349,20518,20680,20843,20991,21156,21306,21457,21577,21746,21900,22055,22179,22336,22462,22589,22653,22842,23028,23215,23395,23584,23766,23949,24117,24310,24496,24683,24855,25044,25218,25393,25537,25738,25932,26127,26307,26504,26686,26869,27021,27222,27408,27595,27751,27940,28098,28257,28353,28570,28780,28991,29187,29400,29598,29797,29965,30182,30384,30587,30759,30964,31138,31313,31425,31650,31860,32071,32251,32464,32646,32829,32949,33166,33352,33539,33663,33852,33978,34105,34105,34105,34105,34106,34106,34109,34111,34114,34114,34121,34127,34134,34138,34147,34153,34160,34160,34175,34189,34204,34216,34233,34247,34262,34270,34291,34309,34328,34340,34361,34375,34390,34390,34421,34451,34482,34510,34543,34573,34604,34628,34665,34699,34734,34762,34799,34829,34860,34876,34921,34963,35006,35042,35087,35125,35164,35188,35237,35279,35322,35350,35395,35425,35456,35456,35519,35581,35644,35704,35769,35831,35894,35950,36019,36085,36152,36212,36281,36343,36406,36454,36531,36605,36680,36748,36825,36895,36966,37022,37103,37177,37252,37312,37389,37451,37514,37546,37639,37729,37820,37904,37997,38083,38170,38242,38339,38429,38520,38596,38689,38767,38846,38894,38999,39097,39196,39280,39381,39467,39554,39610,39715,39805,39896,39956,40049,40111,40174,40174,40301,40427,40554,40678,40807,40933,41060,41180,41313,41443,41574,41698,41831,41957,42084,42196,42337,42475,42614,42746,42887,43021,43156,43276,43421,43559,43698,43822,43963,44089,44216,44312,44469,44623,44778,44926,45083,45233,45384,45520,45681,45835,45990,46130,46287,46429,46572,46684,46853,47015,47178,47326,47491,47641,47792,47912,48081,48235,48390,48514,48671,48797,48924,48988,49177,49363,49550,49730,49919,50101,50284,50452,50645,50831,51018,51190,51379,51553,51728,51872,52073,52267,52462,52642,52839,53021,53204,53356,53557,53743,53930,54086,54275,54433,54592,54688,54905,55115,55326,55522,55735,55933,56132,56300,56517,56719,56922,57094,57299,57473,57648,57760,57985,58195,58406,58586,58799,58981,59164,59284,59501,59687,59874,59998,60187,60313,60440,60440,60695,60949,61204,61456,61713,61967,62222,62470,62731,62989,63248,63500,63761,64015,64270,64510,64779,65045,65312,65572,65841,66103,66366,66614,66887,67153,67420,67672,67941,68195,68450,68674,68959,69241,69524,69800,70085,70363,70642,70906,71195,71477,71760,72028,72313,72583,72854,73094,73391,73681,73972,74248,74541,74819,75098,75346,75643,75925,76208,76460,76745,76999,77254,77446,77763,78077,78392,78700,79017,79327,79638,79934,80255,80569,80884,81184,81501,81803,82106,82378,82707,83029,83352,83660,83985,84295,84606,84886,85215,85529,85844,86128,86445,86731,87018,87242,87587,87925,88264,88588,88929,89255,89582,89878,90223,90553,90884,91184,91517,91819,92122,92362,92715,93053,93392,93700,94041,94351,94662,94910,95255,95569,95884,96136,96453,96707,96962,97090,97471,97849,98228,98600,98981,99355,99730,100090,100475,100853,101232,101596,101977,102343,102710,103046,103439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6 int main() 7 { 8 cin>>n; 9 cout<<ans[n-1]; 10 return 0; 11 }
T2我就交个样例，然后10分养老
以为是个多难的数论，实际上他告诉我是个DP？？？？
1 #include <bits/stdc++.h> 2 #define ll long long 3 #define mo 998244353 4 using namespace std; 5 ll x,y,z; 6 long long ans; 7 ll f[3050][3050]; 8 void solve(int x,int y) 9 { 10 f[1][1]=2; 11 for(int i=2;i<=x;i++) 12 { 13 for(int j=2;j<=y;j++) 14 { 15 f[i][j]=(f[i-1][j]+f[i-1][j-1]*j%mo)%mo; 16 } 17 } 18 } 19 int main() 20 { 21 for(int i=1;i<=3050;i++) 22 f[1][i]=i+1,f[i][1]=i+1; 23 cin>>x>>y>>z; 24 solve(x,y); 25 ll a=f[x][y]; 26 solve(y,z); 27 ll b=f[y][z]; 28 solve(x,z); 29 ll c=f[x][z]; 30 ans=(a*b)%mo*c; 31 cout<<ans%mo<<endl; 32 }
T3是个图论，正解需要建边，然后跑一边spfa就ok了，but我并没有想那么多，直接一发暴力30
#include <bits/stdc++.h> using namespace std; bool vis[3050]; int spfa[3050]; int n,m,k,nw,ny,ans,pos,l,r; int head[10050],top; queue <int>q; struct light{ int x; int y; }a[200050]; struct Node{ int to,nxt,dis; }g[10050]; void add(int u,int v,int d) { g[++top].to=v; g[top].nxt=head[u]; g[top].dis=d; head[u]=top; } void build(int i,int j) { if(((abs(a[i].x-a[j].x)<=1&&a[i].y==a[j].y))||(abs(a[i].y-a[j].y)<=1&&a[i].x==a[j].x)) { add(i,j,0); add(j,i,0); return ; } if(abs(a[i].x-a[j].x)<=2||abs(a[i].y-a[j].y)<=2) { add(i,j,1); add(j,i,1); return ; } } int main() { cin>>n>>m>>k; for(int i=1;i<=k;i++) { cin>>a[i].x>>a[i].y; if(a[i].x==1&&a[i].y==1) { vis[i]=1; q.push(i); } if(a[i].x==n&&a[i].y==m)pos=i; } for(int i=1;i<=k;i++) for(int j=i+1;j<=k;j++)build(i,j); while(!q.empty()) { int now=q.front(); q.pop(); for(int i=head[now];i;i=g[i].nxt) { int j=g[i].to; if(!vis[j]) { vis[j]=true; spfa[j]=spfa[now]+g[i].dis; q.push(j); continue; } if(spfa[j]>spfa[now]+g[i].dis) { spfa[j]=spfa[now]+g[i].dis; q.push(j); } } } //for(register int i=1;i<=k;i++)printf("%d\n",spfa[i]); if(pos) { if(!vis[pos])ans=-1; else ans=spfa[pos]; }else { ans=99999999; for(register int i=1;i<=k;i++) if(vis[i]&&(a[i].x>=n-1||a[i].y>=m-1)) //printf("%d\n",spfa[i]); ans=min(ans,spfa[i]); } if(ans==99999999)ans=-1;else if(ans) ans++; cout<<ans; }
