Compilare: main.cpp: In function 'int maxlengthhi(int, int)': main.cpp:45:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i2 = 0 ; i2 < besta[i].size() ; i2++) ~~~^~~~~~~~~~~~~~~~~ main.cpp:46:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j2 = 0 ; j2 < besta[j].size() ; j2++) ~~~^~~~~~~~~~~~~~~~~ main.cpp:49:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i2 == besta[i].size() - 1 && firsta[j][j2] == 0) ~~~^~~~~~~~~~~~~~~~~~~~~~ main.cpp: In function 'int maxlengthlo(int, int)': main.cpp:57:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i2 = 0 ; i2 < besta[i].size() ; i2++) ~~~^~~~~~~~~~~~~~~~~ main.cpp:58:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j2 = 0 ; j2 < bestd[j].size() ; j2++){ ~~~^~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:93:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0 ; i < it.size() ; i++){ ~~^~~~~~~~~~~ main.cpp:112:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0 ; i < it.size() ; i++){ ~~^~~~~~~~~~~ main.cpp:133:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0 ; i < chains.size() - 1; i++) ~~^~~~~~~~~~~~~~~~~~~ main.cpp:134:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j = i + 1 ; j < chains.size() ; j++) ~~^~~~~~~~~~~~~~~