Compilare: main.cpp: In function 'void dijkstra(int)': main.cpp:111:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < v[currnode].size(); i++) ~~^~~~~~~~~~~~~~~~~~~~ main.cpp:120:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < v[currnode].size(); i++) ~~^~~~~~~~~~~~~~~~~~~~ main.cpp: In function 'bool BFS()': main.cpp:145:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < v[node].size(); i++) ~~^~~~~~~~~~~~~~~~ main.cpp: In function 'void Flow()': main.cpp:164:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < v[N].size(); i++) ~~^~~~~~~~~~~~~ main.cpp: In function 'bool solve(double)': main.cpp:204:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < v[i].size(); j++) ~~^~~~~~~~~~~~~ main.cpp: In member function 'char InParser::read_ch()': main.cpp:22:29: 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); ^