Compilare: main.cpp: In function 'void convex_hull()': main.cpp:57:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 2; i < V.size(); i++) { ~~^~~~~~~~~~ main.cpp:69:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < st.size(); i++) { ~~^~~~~~~~~~~ main.cpp:76:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < st.size() - 1; i++) { ~~^~~~~~~~~~~~~~~ main.cpp:82:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < st.size() - 1; i++) { ~~^~~~~~~~~~~~~~~ main.cpp:91:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 2; i < V.size(); i++) { ~~^~~~~~~~~~ main.cpp:104:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < st.size() - 1; i++) { ~~^~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:176:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < conv.size(); i++) { ~~^~~~~~~~~~~~~ main.cpp:186:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < conv.size(); i++) { ~~^~~~~~~~~~~~~ main.cpp:212:46: warning: format '%d' expects argument of type 'int', but argument 2 has type 'std::set<std::pair<double, std::pair<double, double> > >::size_type {aka long unsigned int}' [-Wformat=] printf("Convex hull size: %d\n", S.size()); ^ main.cpp:215:28: warning: format '%d' expects argument of type 'int', but argument 2 has type 'std::set<std::pair<double, std::pair<double, double> > >::size_type {aka long unsigned int}' [-Wformat=] printf("%d\n", S.size()); ^ main.cpp:248:32: warning: format '%d' expects argument of type 'int', but argument 2 has type 'std::set<std::pair<double, std::pair<double, double> > >::size_type {aka long unsigned int}' [-Wformat=] printf("%d\n", S.size()); ^ main.cpp:258:39: warning: format '%d' expects argument of type 'int', but argument 2 has type 'std::set<std::pair<double, std::pair<double, double> > >::size_type {aka long unsigned int}' [-Wformat=] printf("Set size %d\n", S.size()); ^ main.cpp:260:52: warning: format '%d' expects argument of type 'int', but argument 2 has type 'std::set<std::pair<double, std::pair<double, double> > >::size_type {aka long unsigned int}' [-Wformat=] printf("Set size after insert %d\n", S.size()); ^ main.cpp:268:30: warning: format '%d' expects argument of type 'int', but argument 2 has type 'std::set<std::pair<double, std::pair<double, double> > >::size_type {aka long unsigned int}' [-Wformat=] printf("%d\n", S.size()); ^ main.cpp:163:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("terenuri.in", "r", stdin); ^ main.cpp:164:39: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("terenuri.out", "w", stdout); ^