Compilare: main.cpp: In function 'int main()': main.cpp:63:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=m+2; i<=s.length()-m; ++i) ~^~~~~~~~~~~~~~ main.cpp:65:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (s.length() - i < m) { ~~~~~~~~~~~~~~~^~~ main.cpp:63:3: warning: this 'for' clause does not guard... [-Wmisleading-indentation] for (int i=m+2; i<=s.length()-m; ++i) ^~~ main.cpp:73:4: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for' fout << sol; ^~~~