Compilare: main.cpp: In function 'int32_t main()': main.cpp:12:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int l = 1; 3 * l < s.size(); l ++) ~~~~~~^~~~~~~~~~ main.cpp:15:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i + 2 * l <= s.size(); i ++) ~~~~~~~~~~^~~~~~~~~~~ main.cpp:8:9: warning: unused variable 'n' [-Wunused-variable] int n; ^