Compilare: main.cpp: In member function 'void polig::create(polig&, polig&)': main.cpp:66:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<edges.size(); ++i) ~^~~~~~~~~~~~~ main.cpp: In function 'void add_edges(point, point)': main.cpp:146:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<pct.size(); ++i) ~^~~~~~~~~~~ main.cpp:147:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=i+1; j<pct.size(); ++j) ~^~~~~~~~~~~ main.cpp: In function 'void solve(int, int)': main.cpp:157:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<pct.size(); ++i) dist[i] = inf; ~^~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:183:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("robot.in", "r", stdin); ^ main.cpp:184:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("robot.out", "w", stdout); ^