CSES - Aalto Competitive Programming 2025 - wk12 Homework

Submission details
Task:	Subarray Sums II
Sender:	ileska
Submission time:	2025-11-23 19:34:57 +0200
Language:	C++ (C++20)
Status:	READY
Result:	ACCEPTED

Test results
test	verdict	time
#1	ACCEPTED	0.00 s	details
#2	ACCEPTED	0.00 s	details
#3	ACCEPTED	0.00 s	details
#4	ACCEPTED	0.00 s	details
#5	ACCEPTED	0.17 s	details
#6	ACCEPTED	0.20 s	details
#7	ACCEPTED	0.04 s	details
#8	ACCEPTED	0.09 s	details
#9	ACCEPTED	0.11 s	details
#10	ACCEPTED	0.11 s	details
#11	ACCEPTED	0.11 s	details
#12	ACCEPTED	0.18 s	details
#13	ACCEPTED	0.22 s	details
#14	ACCEPTED	0.22 s	details
#15	ACCEPTED	0.21 s	details
#16	ACCEPTED	0.00 s	details
#17	ACCEPTED	0.00 s	details
#18	ACCEPTED	0.11 s	details
#19	ACCEPTED	0.18 s	details
#20	ACCEPTED	0.11 s	details
#21	ACCEPTED	0.17 s	details
#22	ACCEPTED	0.21 s	details
#23	ACCEPTED	0.21 s	details
#24	ACCEPTED	0.00 s	details
#25	ACCEPTED	0.17 s	details
#26	ACCEPTED	0.16 s	details
#27	ACCEPTED	0.12 s	details
#28	ACCEPTED	0.18 s	details

Code

#include <bits/stdc++.h>
#define ll long long

// ll slow(ll numCount, ll target, std::vector<ll> &nums) {
//   ll count = 0;
//   for (ll aa = 0; aa < numCount; aa++) {
//     ll su = 0;
//     for (ll bb = aa; bb < numCount; bb++) {
//       su += nums[bb];
//       if (su == target)
//         count++;
//     }
//   }
//   return count;
// }

ll fast(ll numCount, ll target, std::vector<ll> &nums) {
  std::map<ll, ll> sums;
  ll su = 0;
  ll count = 0;
  sums[0]++;
  for (ll aa : nums) {
    su += aa;
    count += sums[su - target];
    sums[su]++;
  }
  return count;
}

int main() {
  ll numCount, target;
  std::cin >> numCount >> target;
  std::vector<ll> nums(numCount);
  for (ll ii = 0; ii < numCount; ii++) {
    std::cin >> nums[ii];
  }
  ll debug = 0;
  if (debug) {
    // ll slowRet = slow(numCount, target, nums);
    // ll fastRet = fast(numCount, target, nums);
    // std::cout << "slow " << slowRet << std::endl;
    // std::cout << "fast " << fastRet << std::endl;
    // if (slowRet != fastRet) {
    //   std::cout << "ERR" << std::endl;
    // }
  } else {
    ll fastRet = fast(numCount, target, nums);
    std::cout << fastRet << std::endl;
  }
}

Test details

Test 1

Verdict: ACCEPTED

input
`100 50 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 ...` view save

correct output
`51` view save

user output
`51` view save

Test 2

Verdict: ACCEPTED

input
`100 1000000000 1000000000 1000000000 10000000...` view save

correct output
`100` view save

user output
`100` view save

Test 3

Verdict: ACCEPTED

input
`100 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 ...` view save

correct output
`5050` view save

user output
`5050` view save

Test 4

Verdict: ACCEPTED

input
`100 4 2 1 -3 2 -7 7 -2 6 9 -4 10 -6 ...` view save

correct output
`53` view save

user output
`53` view save

Test 5

Verdict: ACCEPTED

input
`200000 100000 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 ...` view save

correct output
`100001` view save

user output
`100001` view save

Test 6

Verdict: ACCEPTED

input
`200000 1000000000 1000000000 1000000000 10000000...` view save

correct output
`200000` view save

user output
`200000` view save

Test 7

Verdict: ACCEPTED

input
`200000 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 ...` view save

correct output
`20000100000` view save

user output
`20000100000` view save

Test 8

Verdict: ACCEPTED

input
`200000 39 44 -62 -3 23 11 -68 42 69 -22 ...` view save

correct output
`903601` view save

user output
`903601` view save

Test 9

Verdict: ACCEPTED

input
`131072 199999 199999 199999 199999 199999 19...` view save

correct output
`131072` view save

user output
`131072` view save

Test 10

Verdict: ACCEPTED

input
`131072 107897 107897 107897 107897 107897 10...` view save

correct output
`131072` view save

user output
`131072` view save

Test 11

Verdict: ACCEPTED

input
`131072 126271 126271 126271 126271 126271 12...` view save

correct output
`131072` view save

user output
`131072` view save

Test 12

Verdict: ACCEPTED

input
`200000 107897 107897 107897 107897 107897 10...` view save

correct output
`199999` view save

user output
`199999` view save

Test 13

Verdict: ACCEPTED

input
`200000 100000 1056323 1056323 1056323 105632...` view save

correct output
`0` view save

user output
`0` view save

Test 14

Verdict: ACCEPTED

input
`200000 100000 2144977 2144977 2144977 214497...` view save

correct output
`0` view save

user output
`0` view save

Test 15

Verdict: ACCEPTED

input
`200000 100000 65536 65536 65536 65536 65536 ...` view save

correct output
`0` view save

user output
`0` view save

Test 16

Verdict: ACCEPTED

input
`5 0 0 0 0 0 0` view save

correct output
`15` view save

user output
`15` view save

Test 17

Verdict: ACCEPTED

input
`20 536870912 268435456 268435456 268435456 ...` view save

correct output
`19` view save

user output
`19` view save

Test 18

Verdict: ACCEPTED

input
`131072 136607 136607 136607 136607 136607 13...` view save

correct output
`131072` view save

user output
`131072` view save

Test 19

Verdict: ACCEPTED

input
`200000 562841 562841 562841 562841 562841 56...` view save

correct output
`200000` view save

user output
`200000` view save

Test 20

Verdict: ACCEPTED

input
`107897 107897 107897 107897 107897 107897 10...` view save

correct output
`107897` view save

user output
`107897` view save

Test 21

Verdict: ACCEPTED

input
`200000 202409 101204 101205 101204 101205 10...` view save

correct output
`199998` view save

user output
`199998` view save

Test 22

Verdict: ACCEPTED

input
`200000 202409 138630 138631 138630 138631 13...` view save

correct output
`0` view save

user output
`0` view save

Test 23

Verdict: ACCEPTED

input
`200000 10273 410857 410857 410857 410857 41...` view save

correct output
`0` view save

user output
`0` view save

Test 24

Verdict: ACCEPTED

input
`5 2 1 -1 1 -1 2` view save

correct output
`3` view save

user output
`3` view save

Test 25

Verdict: ACCEPTED

input
`200000 1 1048577 -1048570 29 145 725 36...` view save

correct output
`104671` view save

user output
`104671` view save

Test 26

Verdict: ACCEPTED

input
`200000 1 1048577 -1048571 25 125 625 31...` view save

correct output
`104859` view save

user output
`104859` view save

Test 27

Verdict: ACCEPTED

input
`200000 0 5334500 -3502392 3421268 -2064...` view save

correct output
`6341575890` view save

user output
`6341575890` view save

Test 28

Verdict: ACCEPTED

input
`200000 0 172933 172933 172933 172933 17...` view save

correct output
`0` view save

user output
`0` view save

Aalto Competitive Programming 2025 - wk12 Homework

Subarray Sums II

Code

Test details

Test 1

Test 2

Test 3

Test 4

Test 5

Test 6

Test 7

Test 8

Test 9

Test 10

Test 11

Test 12

Test 13

Test 14

Test 15

Test 16

Test 17

Test 18

Test 19

Test 20

Test 21

Test 22

Test 23

Test 24

Test 25

Test 26

Test 27

Test 28

Tasks

Submissions (ileska)