Compilare: main.cpp: In function 'int main()': main.cpp:17:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i+k <= bits.length(); i++) { ~~~~^~~~~~~~~~~~~~~~ main.cpp:25:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; i <= bits.length(); i++) ~~^~~~~~~~~~~~~~~~ main.cpp:28:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < bits.length(); i++) { ~~^~~~~~~~~~~~~~~ main.cpp:30:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = i; j < i+k && j < bits.length(); j++) { ~~^~~~~~~~~~~~~~~ main.cpp:33:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int a = 0; a < bits.length(); a++) ~~^~~~~~~~~~~~~~~ main.cpp:41:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < update[i].size(); j++) ~~^~~~~~~~~~~~~~~~~~ main.cpp:46:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i <= bits.length(); i++) ~~^~~~~~~~~~~~~~~~