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CONSOLIDATED STATEMENTS OF CASH FLOWS - CNY (¥) ¥ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Cash flows from operating activities: |  |  |
Net loss | ¥ (669,214) | ¥ (442,083) | ¥ (430,268)
Adjustments to reconcile net loss to net cash (used in) provided by operating activities: |  |  |
Amortization of debt issuance and commitment cost and debt discount | 160,699 | 99,380 | 61,373
Depreciation and amortization | 1,638,474 | 1,142,032 | 741,507
Operating lease cost relating to prepaid land use rights | 20,412 |  |
Net loss (gain) on disposal of property and equipment | (256) | (703) | 2,212
Share-based compensation expenses | 333,686 | 189,756 | 105,877
Gain from purchase price adjustment | (55,154) |  |
Loss from equity method investment | 3,375 | 1,213 |
Allowance for doubtful accounts | 2,037 | 274 | 241
Deferred tax benefit | (89,739) | (50,172) | (36,597)
Changes in operating assets and liabilities, net of effect of acquisitions: |  |  |
Accounts receivable | (465,189) | (342,191) | (157,708)
VAT recoverable | (463,630) | (323,044) | (221,390)
Prepaid expenses | (53,933) | (13,320) | (14,153)
Other current assets | 65,756 | (8,095) | (11,477)
Other non-current assets | (72,099) | (8,678) | (37,035)
Accounts payable | 119,163 | 22,540 | 25,292
Deferred revenue | 6,285 | 31,417 | 17,468
Accrued expenses and other payables | (139,891) | (20,434) | (56,693)
Other long-term liabilities | 9,015 | 1,299 | (1,559)
Operating leases | (28,910) | 14,245 |
Net cash (used in) provided by operating activities | 320,887 | 293,436 | (12,910)
Cash flows from investing activities |  |  |
Payments for purchase of property and equipment and land use rights | (8,037,002) | (4,557,686) | (4,260,977)
Cash acquired from the business combinations | 4,801 | 12,091 | 466
Cash paid for the business combinations | (1,172,518) | (190,066) | (359,372)
Cash paid for the asset acquisitions | (180,910) | (363,939) | (115,167)
Cash paid for equity investments | (4,500) | (6,000) |
Cash paid for potential acquisitions | (4,300) | (30,700) | (1,000)
Proceeds from sale of property and equipment | 16,422 | 5,069 | 13,896
Deposits paid for construction of property and equipment |  |  | (10,896)
Net cash used in investing activities | (9,378,007) | (5,131,231) | (4,733,050)
Cash flows from financing activities: |  |  |
Proceeds from short-term borrowings | 1,156,215 | 467,744 | 943,088
Proceeds from long-term borrowings | 6,939,140 | 5,000,510 | 2,814,197
Repayment of short-term borrowings | (438,925) | (758,941) | (776,224)
Repayment of long-term borrowings | (4,187,184) | (1,968,913) | (834,154)
Payment of issuance cost of borrowings | (112,512) | (156,742) | (91,124)
Payment of commitment cost of borrowings | (45,968) |  |
Proceeds from exercise of stock options | 78,748 | 55,469 | 16,866
Net proceeds from issuance of convertible bonds |  |  | 1,867,304
Net proceeds from issuance of ordinary shares | 15,974,517 | 4,934,126 | 1,283,308
Net proceeds from issuance of redeemable preferred shares |  | 989,349 |
Payment of redeemable preferred shares dividends | (65,489) | (25,014) |
Capital contribution from redeemable non-controlling shareholder | 105,000 |  |
Payment under finance leases and other financing obligations | (198,234) | (289,467) | (190,718)
Proceeds from other financing arrangements | 1,079,370 | 302,761 |
Payment for purchase of property and equipment through vendor financing | (92,299) | (68,864) |
Payment of contingent consideration for the acquisition of subsidiaries | (48,718) | (120,079) | (155,737)
Net cash provided by financing activities | 20,143,661 | 8,361,939 | 4,876,806
Effect of exchange rate changes on cash and restricted cash | (566,874) | 164,370 | 206,302
Net increase in cash and restricted cash | 10,519,667 | 3,688,514 | 337,148
Cash and restricted cash at beginning of year | 5,973,262 | 2,284,748 | 1,947,600
Cash and restricted cash at end of year | 16,492,929 | 5,973,262 | 2,284,748
Supplemental disclosures of cash flow information |  |  |
Interest paid | 1,113,443 | 841,388 | 633,063
Income tax paid | 211,612 | 17,031 | 3,371
Supplemental disclosures of non-cash investing and financing activities |  |  |
Changes in consideration payable for the acquisition of subsidiaries | 718,546 | 239,096 | 148,217
Settlement of liability-classified restricted share award | 10,089 | ¥ 7,984 | ¥ 6,357
Conversion of convertible bonds | ¥ 65 |  |

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