Compilare: main.cpp: In function 'int merge_vertex(int, int)': main.cpp:71:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ main.cpp: In function 'int main()': main.cpp:111:34: warning: narrowing conversion of 'u' from 'int' to 'double' inside { } [-Wnarrowing] ans[++ k] = {u, v}; ^ main.cpp:111:34: warning: narrowing conversion of 'v' from 'int' to 'double' inside { } [-Wnarrowing] main.cpp:76:17: warning: unused variable 'm' [-Wunused-variable] int c, tst, m, nr, i,j, tx, ty, k, u, v; ^ main.cpp:76:26: warning: unused variable 'j' [-Wunused-variable] int c, tst, m, nr, i,j, tx, ty, k, u, v; ^ main.cpp:76:29: warning: unused variable 'tx' [-Wunused-variable] int c, tst, m, nr, i,j, tx, ty, k, u, v; ^~ main.cpp:76:33: warning: unused variable 'ty' [-Wunused-variable] int c, tst, m, nr, i,j, tx, ty, k, u, v; ^~ main.cpp:74:39: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("poligon7.in", "r", stdin); ^ main.cpp:75:41: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("poligon7.out", "w", stdout); ^ main.cpp:78:28: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &c, &tst); ^ main.cpp:81:24: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ main.cpp:84:36: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%lf%lf", &x, &y); ^