Compilare: main.cpp: In function 'bool Exista_Solutie()': main.cpp:127:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j = 0; j < CTC[i].size(); j++) ~~^~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:221:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j = 0; j < G[i].size(); j++) ~~^~~~~~~~~~~~~ main.cpp: In function 'char read_ch()': main.cpp:23:34: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(buff, 1, 4096, fin); ^