Compilare: user.cpp: In function ‘int main()’: user.cpp:22:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<n; ++i) ^ user.cpp:23:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j=0; j<n; ++j) m[i][j]=inf; ^ user.cpp:25:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=1; i<=M; ++i) ^ user.cpp:33:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<nr; ++i) ^ user.cpp:34:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j=0; j<n; ++j) hamilton[i][j] = inf; ^ user.cpp:38:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=1; i<nr-1; ++i) ^ user.cpp:40:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j=1; j<n; ++j) ^ user.cpp:46:37: warning: suggest parentheses around comparison in operand of ‘|’ [-Wparentheses] if (i | (1<<*it) != i) hamilton [i | (1<<*it)][*it] = min (hamilton[i | (1<<*it)][*it],hamilton [i][j] + m[j][*it]); ^ user.cpp:53:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=1; i<n; ++i) ^