Compilare: main.cpp: In function 'void solve()': main.cpp:22:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i < s.size(); ++i) { ~~^~~~~~~~~~ main.cpp:32:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (i == s.size() - 1 && val < rez) { ~~^~~~~~~~~~~~~~~ main.cpp:47:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (i == s.size() - 1 && pd2[i][k] < rez) { ~~^~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:61:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i < s.size(); ++i) { ~~^~~~~~~~~~