{"problem":{"name":"Guess The Number","description":{"content":"If there is an integer not less than $0$ satisfying the following conditions, print the smallest such integer; otherwise, print `-1`. *   The integer has exactly $N$ digits in base ten. (We assume $0","description_type":"Markdown"},"platform":"AtCoder","limit":{"time_limit":2000,"memory_limit":262144},"difficulty":"None","is_remote":true,"is_sync":true,"sync_url":null,"sign":"abc157_c"},"statements":[{"statement_type":"Markdown","content":"If there is an integer not less than $0$ satisfying the following conditions, print the smallest such integer; otherwise, print `-1`.\n\n*   The integer has exactly $N$ digits in base ten. (We assume $0$ to be a $1$\\-digit integer. For other integers, leading zeros are not allowed.)\n*   The $s_i$\\-th digit from the left is $c_i$. $\\left(i = 1, 2, \\cdots, M\\right)$\n\n## Constraints\n\n*   All values in input are integers.\n*   $1 \\leq N \\leq 3$\n*   $0 \\leq M \\leq 5$\n*   $1 \\leq s_i \\leq N$\n*   $0 \\leq c_i \\leq 9$\n\n## Input\n\nInput is given from Standard Input in the following format:\n\n$N$ $M$\n$s_1$ $c_1$\n$\\vdots$\n$s_M$ $c_M$\n\n[samples]","is_translate":false,"language":"English"}],"meta":{"iden":"abc157_c","tags":[],"sample_group":[["3 3\n1 7\n3 2\n1 7","702\n\n$702$ satisfies the conditions - its $1$\\-st and $3$\\-rd digits are `7` and `2`, respectively - while no non-negative integer less than $702$ satisfies them."],["3 2\n2 1\n2 3","\\-1"],["3 1\n1 0","\\-1"]],"created_at":"2026-03-03 11:01:14"}}