Cody

# Problem 1699. Find last zero for each column

Solution 3197291

Submitted on 13 Oct 2020 by ivan fernandez
This solution is locked. To view this solution, you need to provide a solution of the same size or smaller.

### Test Suite

Test Status Code Input and Output
1   Pass
a = 0; z_correct = 1; assert(isequal(lastzerorow(a),z_correct))

a = 0; z_correct = 1; assert(isequal(lastzerorow(a),z_correct)) z = 1

2   Pass
a = 1; z_correct = 0; assert(isequal(lastzerorow(a),z_correct))

a = 1; z_correct = 0; assert(isequal(lastzerorow(a),z_correct)) z = 0

3   Pass
a = randi(1000,1000,1); z_correct = 0; assert(isequal(lastzerorow(a),z_correct))

a = randi(1000,1000,1); z_correct = 0; assert(isequal(lastzerorow(a),z_correct)) z = 0

4   Pass
a = [0;1;0;2;0;3;0;4;0;5;0;6;0;7;0;8;0;9;0;10]; z_correct = 19; assert(isequal(lastzerorow(a),z_correct))

a = [0;1;0;2;0;3;0;4;0;5;0;6;0;7;0;8;0;9;0;10]; z_correct = 19; assert(isequal(lastzerorow(a),z_correct)) z = 19

5   Pass
n = randi(1000); a = tril(ones(n)); z_correct = 0:n-1; assert(isequal(lastzerorow(a),z_correct))

n = randi(1000); a = tril(ones(n)); z_correct = 0:n-1; assert(isequal(lastzerorow(a),z_correct)) z = Columns 1 through 29 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 Columns 30 through 58 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 Columns 59 through 87 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 Columns 88 through 116 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 Columns 117 through 145 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 Columns 146 through 174 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 Columns 175 through 203 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 Columns 204 through 232 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 Columns 233 through 261 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 Columns 262 through 290 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 Columns 291 through 319 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 Columns 320 through 348 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 Columns 349 through 377 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 Columns 378 through 404 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403

6   Pass
n = randi(1000); a = tril(ones(n),-1); z_correct = 1:n; assert(isequal(lastzerorow(a),z_correct))

n = randi(1000); a = tril(ones(n),-1); z_correct = 1:n; assert(isequal(lastzerorow(a),z_correct)) z = Columns 1 through 29 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 Columns 30 through 58 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 Columns 59 through 87 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 Columns 88 through 116 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 Columns 117 through 145 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 Columns 146 through 174 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 Columns 175 through 203 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 Columns 204 through 232 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 Columns 233 through 261 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 Columns 262 through 290 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 Columns 291 through 312 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312

7   Pass
n = randi(1000); d = randi(n-1); a = tril(ones(n),-d); z_correct = min((0:n-1)+d,n); assert(isequal(lastzerorow(a),z_correct))

n = randi(1000); d = randi(n-1); a = tril(ones(n),-d); z_correct = min((0:n-1)+d,n); assert(isequal(lastzerorow(a),z_correct)) z = Columns 1 through 29 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 Columns 30 through 58 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 Columns 59 through 87 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 Columns 88 through 116 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 Columns 117 through 145 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 Columns 146 through 174 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 Columns 175 through 203 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 717 717 717 717 717 717 717 Columns 204 through 232 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 Columns 233 through 261 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 Columns 262 through 290 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 Columns 291 through 319 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 Columns 320 through 348 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 Columns 349 through 377 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 Columns 378 through 406 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 Columns 407 through 435 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 Columns 436 through 464 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 Columns 465 through 493 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 Columns 494 through 522 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 Columns 523 through 551 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 Columns 552 through 580 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 Columns 581 through 609 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 Columns 610 through 638 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 Columns 639 through 667 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 Columns 668 through 696 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 Columns 697 through 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717 717

8   Pass
a = magic(10)-1; z_correct = [0 0 1 0 0 0 0 0 0 0]; assert(isequal(lastzerorow(a),z_correct))

a = magic(10)-1; z_correct = [0 0 1 0 0 0 0 0 0 0]; assert(isequal(lastzerorow(a),z_correct)) z = 0 0 1 0 0 0 0 0 0 0

9   Pass
a = [0 0 9 0; 0 0 1 8; 0 0 4 0; 0 0 2 3; 0 6 7 5]; z_correct = [5 4 0 3]; assert(isequal(lastzerorow(a),z_correct))

a = [0 0 9 0; 0 0 1 8; 0 0 4 0; 0 0 2 3; 0 6 7 5]; z_correct = [5 4 0 3]; assert(isequal(lastzerorow(a),z_correct)) z = 5 4 0 3

10   Pass
a = [0 0 0 0 -4 0 0 0 0; 0 0 0 -3 -3 -3 0 0 0; 0 0 -2 3 -2 2 2 0 0; 0 -1 2 -1 1 -1 -1 1 0]; z_correct = [4 3 2 1 0 1 2 3 4]; assert(isequal(lastzerorow(a),z_correct))

a = [0 0 0 0 -4 0 0 0 0; 0 0 0 -3 -3 -3 0 0 0; 0 0 -2 3 -2 2 2 0 0; 0 -1 2 -1 1 -1 -1 1 0]; z_correct = [4 3 2 1 0 1 2 3 4]; assert(isequal(lastzerorow(a),z_correct)) z = 4 3 2 1 0 1 2 3 4

### Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!