Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:19:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < g[k].size(); ++i) ^ user.cpp: In function ‘void back(int)’: user.cpp:41:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(k > terminalNodes.size()) { ^ user.cpp:45:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < terminalNodes.size(); ++i) ^ user.cpp:70:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < a[SOURCE].size(); ++i) ^ user.cpp:82:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < terminalNodes.size(); ++i) ^ user.cpp: In function ‘void preCompute(int)’: user.cpp:101:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < terminalNodes.size(); ++j) ^ user.cpp: In function ‘long long int BELLMAN_FORD()’: user.cpp:138:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0; i < a[k].size(); ++i) { ^