Compilare: user.cpp: In function ‘void updObst(int)’: user.cpp:125:43: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < OldObst[idx].size(); ++ i) ^ user.cpp: In function ‘bool inPoly(Point, int)’: user.cpp:133:44: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < Obst[idx].size() - 1; ++ i) ^ user.cpp: In function ‘void BuildGraph()’: user.cpp:173:46: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < Obst[i].size() - 1; ++ j) ^ user.cpp: In function ‘void readRobCoord()’: user.cpp:75:41: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &v[i].x, &v[i].y); ^ user.cpp: In function ‘void readObst(int)’: user.cpp:84:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &sz); ^ user.cpp:88:63: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &OldObst[idx][i].x, &OldObst[idx][i].y); ^ user.cpp: In function ‘int main()’: user.cpp:215:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ user.cpp:218:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &m); ^ user.cpp:224:35: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &lst.x, &lst.y); ^