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Diffstat (limited to 'strange_printer.cpp')
-rw-r--r-- | strange_printer.cpp | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/strange_printer.cpp b/strange_printer.cpp new file mode 100644 index 0000000..8a5dc93 --- /dev/null +++ b/strange_printer.cpp @@ -0,0 +1,32 @@ +// 664. Strange Printer +#include "leetcode.h" + +/* + * there is a strange printer with the following two special properties: + * - the printer can only print a sequence of the same character each time + * - at each turn, the printer can print new characters starting from and eding + * at any place and will cover the origin existing characters given a string + * 's', return the minimum number of turns the printer needed to print it. + */ + +class Solution { +public: + int strangePrinter(string s) { + int n = s.size(); + vector<vector<int>> dp(n + 1, vector<int>(n)); + for (int i = n - 1; i >= 0; i--) + for (int j = i; j < n; j++) { + dp[i][j] = 1 + dp[i + 1][j]; + for (int k = i + 1; k <= j; k++) + if (s[k] == s[i]) + dp[i][j] = min(dp[i][j], dp[i + 1][k - 1] + dp[k][j]); + } + return dp[0][n - 1]; + } +}; + +int main() { + Solution obj; + printf("%d\n", obj.strangePrinter("aaabbb")); // expect: 2 + printf("%d\n", obj.strangePrinter("aba")); // expect: 2 +} |