Compilare: user.cpp: In function ‘int main()’: user.cpp:48:49: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < leftEdge[node].size() && rightPair[leftEdge[node][i]]; i++); ^ user.cpp:49:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (i == leftEdge[node].size()) { ^ user.cpp:67:50: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < rightEdge[node].size() && leftPair[rightEdge[node][i]]; i++); ^ user.cpp:68:43: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (i == rightEdge[node].size()) { ^