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QOJ
ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#584781 | #6410. Classical DP Problem | BreakPlus | ML | 145ms | 467520kb | C++14 | 1.4kb | 2024-09-23 16:42:41 | 2024-09-23 16:42:41 |
Judging History
answer
#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
const ll mod=998244353;
ll n,a[5005],b[5005],fac[5005],sw[5005][5005];
ll f[5005][5005], g[5005][5005], C[5005][5005];
int main(){
C[0][0]=1;
for(ll i=1;i<=5000;i++){
C[i][0]=1;
sw[i][0]=1;
for(ll j=1;j<=5000;j++) sw[i][j]=sw[i][j-1]*i%mod;
for(ll j=1;j<=i;j++){
C[i][j]=(C[i-1][j]+C[i-1][j-1])%mod;
}
}
scanf("%lld",&n);
ll r=0;
fac[0]=1;
for(ll i=1;i<=n;i++) fac[i]=fac[i-1]*i%mod;
for(ll i=n;i>=1;i--){
scanf("%lld",&a[i]);
r=max(r, min(i,a[i]));
for(ll j=1;j<=a[i];j++) b[j]++;
}
ll l1=0, l2=0;
for(ll i=r;i>=1;i--){
if(a[i]==r) l1++;
else break;
}
for(ll i=r;i>=1;i--){
if(b[i]==r) l2++;
else break;
}
ll ans=0;
f[0][0]=1;
for(ll i=1;i<=r;i++){
for(ll j=0;j<=i;j++){
f[i][j]=f[i-1][j];
if(j) f[i][j]=(f[i][j]+f[i-1][j-1]*(a[i]-r))%mod;
}
}
g[0][0]=1;
for(ll i=1;i<=r;i++){
for(ll j=0;j<=i;j++){
g[i][j]=g[i-1][j];
if(j) g[i][j]=(g[i][j]+g[i-1][j-1]*(b[i]-r))%mod;
}
}
for(ll i=0;i<=l2;i++){
ll res=0;
for(ll j=0,xs=1;j<=r-l2;j++,xs=mod-xs){
res=(res+xs*C[r-l2][j]%mod*sw[r-j][r-i])%mod;
}
ans=(ans+res*f[r][i])%mod;
}
for(ll i=0;i<=l1;i++){
ll res=0;
for(ll j=0,xs=1;j<=r-l1;j++,xs=mod-xs){
res=(res+xs*C[r-l1][j]%mod*sw[r-j][r-i])%mod;
}
ans=(ans+res*g[r][i])%mod;
}
ans=(ans+mod-fac[r])%mod;
printf("%lld %lld\n", r, ans);
}
Details
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Test #1:
score: 100
Accepted
time: 102ms
memory: 352476kb
input:
3 1 2 3
output:
2 6
result:
ok 2 number(s): "2 6"
Test #2:
score: 0
Accepted
time: 112ms
memory: 357416kb
input:
1 1
output:
1 1
result:
ok 2 number(s): "1 1"
Test #3:
score: 0
Accepted
time: 121ms
memory: 358276kb
input:
2 1 1
output:
1 2
result:
ok 2 number(s): "1 2"
Test #4:
score: 0
Accepted
time: 110ms
memory: 358948kb
input:
2 2 2
output:
2 6
result:
ok 2 number(s): "2 6"
Test #5:
score: 0
Accepted
time: 133ms
memory: 358220kb
input:
3 1 1 1
output:
1 3
result:
ok 2 number(s): "1 3"
Test #6:
score: 0
Accepted
time: 120ms
memory: 358920kb
input:
3 2 2 2
output:
2 9
result:
ok 2 number(s): "2 9"
Test #7:
score: 0
Accepted
time: 102ms
memory: 359176kb
input:
3 3 3 3
output:
3 48
result:
ok 2 number(s): "3 48"
Test #8:
score: 0
Accepted
time: 145ms
memory: 358000kb
input:
5 1 1 3 3 4
output:
3 47
result:
ok 2 number(s): "3 47"
Test #9:
score: 0
Accepted
time: 126ms
memory: 358844kb
input:
10 2 4 5 5 5 5 6 8 8 10
output:
5 864
result:
ok 2 number(s): "5 864"
Test #10:
score: 0
Accepted
time: 130ms
memory: 359280kb
input:
30 6 8 9 9 9 10 13 14 15 15 16 17 17 18 20 22 22 23 23 24 24 25 25 25 27 28 28 29 29 30
output:
17 986189864
result:
ok 2 number(s): "17 986189864"
Test #11:
score: 0
Accepted
time: 119ms
memory: 359308kb
input:
123 1 1 1 2 2 3 3 6 6 7 7 7 8 8 9 9 10 10 10 11 12 12 12 13 14 14 14 14 16 17 17 17 17 17 18 19 20 20 21 21 22 22 22 23 23 23 25 25 26 27 27 28 28 28 28 29 29 30 31 31 31 32 33 33 33 34 35 35 35 36 37 37 38 39 39 39 39 40 41 41 42 42 42 43 44 48 48 50 52 53 55 56 57 57 57 58 65 68 71 74 75 76 76 82 ...
output:
42 287179924
result:
ok 2 number(s): "42 287179924"
Test #12:
score: 0
Accepted
time: 97ms
memory: 361012kb
input:
1234 1 1 1 2 2 2 2 3 3 3 3 4 4 4 4 4 5 5 5 5 6 6 7 7 7 7 7 7 7 8 8 8 8 9 9 10 10 10 11 11 11 11 11 12 13 13 14 14 15 15 15 15 16 16 16 17 17 17 18 18 18 19 19 19 19 19 19 19 19 19 19 20 20 20 21 21 21 21 21 22 22 22 23 23 23 23 23 23 23 23 23 24 24 24 24 24 24 24 24 24 24 25 25 25 25 25 26 26 26 26 ...
output:
239 98119841
result:
ok 2 number(s): "239 98119841"
Test #13:
score: 0
Accepted
time: 135ms
memory: 379448kb
input:
2345 1 1 2 2 2 7 7 9 9 9 9 15 17 19 19 22 23 24 25 29 29 29 30 31 32 33 35 37 39 41 42 42 43 43 44 46 46 46 47 48 48 50 51 51 52 53 53 54 55 56 57 58 58 60 61 63 63 64 65 65 65 66 67 67 67 69 69 69 70 71 72 72 73 73 74 75 75 77 77 79 83 85 86 88 90 90 91 93 94 97 99 104 106 107 108 108 109 109 110 1...
output:
1239 588926916
result:
ok 2 number(s): "1239 588926916"
Test #14:
score: 0
Accepted
time: 139ms
memory: 415628kb
input:
3456 4 7 8 8 9 19 20 21 22 23 23 27 29 29 32 32 33 43 45 50 52 52 55 58 58 58 60 62 66 67 68 69 71 74 74 76 77 79 82 82 87 87 88 91 93 95 96 97 99 102 104 106 107 108 121 121 123 126 127 131 137 138 139 142 145 147 152 156 157 159 161 165 166 170 170 172 174 175 178 182 183 185 186 189 190 195 195 1...
output:
2239 24387925
result:
ok 2 number(s): "2239 24387925"
Test #15:
score: 0
Accepted
time: 140ms
memory: 467520kb
input:
4456 4 7 10 10 22 24 29 33 33 34 35 37 40 41 47 48 55 61 61 65 69 71 76 91 95 99 105 105 105 110 112 113 117 117 120 121 122 123 125 127 130 134 135 138 140 141 142 142 144 150 153 154 157 162 165 169 170 170 174 175 176 178 197 198 198 201 208 211 211 212 214 214 215 217 220 224 224 225 230 231 232...
output:
3239 904395650
result:
ok 2 number(s): "3239 904395650"
Test #16:
score: -100
Memory Limit Exceeded
input:
5000 1 5 7 8 24 28 36 47 50 56 59 64 66 85 89 94 95 95 98 108 110 117 122 155 157 158 163 172 172 179 186 197 198 220 236 251 254 254 256 265 287 288 298 302 306 312 327 336 343 344 345 348 350 360 363 364 382 382 390 399 402 406 412 421 425 435 442 445 450 451 453 478 481 490 491 496 499 500 500 50...
output:
4239 328488156