Compilare: main.cpp: In function 'int solve1()': main.cpp:32:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = k; i < s.size(); ++i) { ~~^~~~~~~~~~ main.cpp: In function 'void solve2()': main.cpp:44:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i <= s.size(); ++i) { ~~^~~~~~~~~~~ main.cpp:59:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < k && i + j < s.size(); ++j) { ~~~~~~^~~~~~~~~~