Compilare: main.cpp: In function 'void bfs(int)': main.cpp:29:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < g2[top].size(); i++) t[top].first = max(t[top].first, t[g2[top][i]].first + d[g2[top][i]]); ~~^~~~~~~~~~~~~~~~ main.cpp:31:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < g[top].size(); i++) drum.push(g[top][i]); ~~^~~~~~~~~~~~~~~ main.cpp:27:27: warning: unused variable 'm' [-Wunused-variable] int top = drum.front(), m = 0; ^ main.cpp: In function 'void bfs2(int)': main.cpp:42:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < g[top].size(); i++) t[top].second = min(t[top].second, t[g[top][i]].second - d[top]); ~~^~~~~~~~~~~~~~~ main.cpp:44:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < g2[top].size(); i++) drum.push(g2[top][i]); ~~^~~~~~~~~~~~~~~~ main.cpp:40:27: warning: unused variable 'm' [-Wunused-variable] int top = drum.front(), m = 1e9; ^