Compilare: main.cpp: In function 'int main()': main.cpp:79:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; i <= big.length(); i ++) ~~^~~~~~~~~~~~~~~ main.cpp:89:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < v.size()-1; i ++) ~~^~~~~~~~~~~~ main.cpp:90:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = i+1; j < v.size(); j ++) ~~^~~~~~~~~~