Compilare: main.cpp: In function 'void read()': main.cpp:27:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < g[1].size(); i++) ~~^~~~~~~~~~~~~ main.cpp: In function 'void preflux()': main.cpp:42:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < g[i].size(); j++) ~~^~~~~~~~~~~~~ main.cpp:65:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < g[i].size(); j++) ~~^~~~~~~~~~~~~