Compilare: main.cpp: In function 'int main()': main.cpp:52:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < ind.second.size(); i++) { ~~^~~~~~~~~~~~~~~~~~~ main.cpp:45:7: warning: unused variable 'last' [-Wunused-variable] int last = -1; ^~~~ main.cpp:46:10: warning: unused variable 'last_circle' [-Wunused-variable] Circle last_circle; ^~~~~~~~~~~ main.cpp:47:7: warning: unused variable 'ans1' [-Wunused-variable] int ans1 = 0, nrMax = 1, frecv; ^~~~ main.cpp:32:34: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("cerc3.in", "r", stdin); ^ main.cpp:33:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("cerc3.out", "w", stdout); ^ main.cpp:36:18: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ main.cpp:40:62: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d", &circles[i].x, &circles[i].y, &circles[i].r); ^ main.cpp:64:14: warning: 'frecv' may be used uninitialized in this function [-Wmaybe-uninitialized] frecv++; ^