Compilare: main.cpp: In function 'void solve()': main.cpp:35:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int k = 0; k < graph[i].size(); ++k) ~~^~~~~~~~~~~~~~~~~ main.cpp:34:35: warning: suggest explicit braces to avoid ambiguous 'else' [-Wparentheses] for(int i = 0; i < n; ++i) if((1 << i) & j) ^ main.cpp:45:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < graph[i].size(); ++j) ~~^~~~~~~~~~~~~~~~~ main.cpp: In function 'void read()': main.cpp:14:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("hamilton.in", "r", stdin); ^ main.cpp:16:24: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &m); ^ main.cpp:20:32: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d", &x, &y, &c); ^ main.cpp: In function 'void write()': main.cpp:51:39: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("hamilton.out", "w", stdout); ^